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1. Architecture of Fluvial and Deltaic Deposits Exposed Along the Eastern Edge of the Western Fan of Jezero Crater, Mars

Author

Mangold, N., primary, Caravaca, G., additional, Gupta, S., additional, Williams, R. M. E., additional, Dromart, G., additional, Gasnault, O., additional, Le Mouélic, S., additional, Paar, G., additional, Bell, J., additional, Beyssac, O., additional, Carlot, N., additional, Cousin, A., additional, Dehouck, E., additional, Horgan, B., additional, Kah, L. C., additional, Lasue, J., additional, Maurice, S., additional, Núñez, J. I., additional, Shuster, D., additional, Stack, K. M., additional, Weiss, B. P., additional, and Wiens, R. C., additional

Published
2024
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2. Sedimentology and Stratigraphy of the Shenandoah Formation, Western Fan, Jezero Crater, Mars

Author

Stack, K. M., Ives, L. R. W., Gupta, S., Lamb, M. P., Tebolt, M., Caravaca, G., Grotzinger, J. P., Russell, P., Shuster, D. L., Williams, A. J., Amundsen, H., Alwmark, S., Annex, A. M., Barnes, R., Bell, J., Beyssac, O., Bosak, T., Crumpler, L. S., Dehouck, E., Gwizd, S. J., Hickman-Lewis, K., Horgan, B. H. N., Hurowitz, J., Kalucha, H., Kanine, O., Lesh, C., Maki, J., Mangold, N., Randazzo, N., Seeger, C., Williams, R. M. E., Brown, A., Cardarelli, E., Dypvik, H., Flannery, D., Frydenvang, J., Hamran, S.-E., Núñez, J. I., Paige, D., Simon, J. I., Tice, M., Tate, C., Wiens, R. C., Stack, K. M., Ives, L. R. W., Gupta, S., Lamb, M. P., Tebolt, M., Caravaca, G., Grotzinger, J. P., Russell, P., Shuster, D. L., Williams, A. J., Amundsen, H., Alwmark, S., Annex, A. M., Barnes, R., Bell, J., Beyssac, O., Bosak, T., Crumpler, L. S., Dehouck, E., Gwizd, S. J., Hickman-Lewis, K., Horgan, B. H. N., Hurowitz, J., Kalucha, H., Kanine, O., Lesh, C., Maki, J., Mangold, N., Randazzo, N., Seeger, C., Williams, R. M. E., Brown, A., Cardarelli, E., Dypvik, H., Flannery, D., Frydenvang, J., Hamran, S.-E., Núñez, J. I., Paige, D., Simon, J. I., Tice, M., Tate, C., and Wiens, R. C.

Abstract

Sedimentary fans are key targets of exploration on Mars because they record the history of surface aqueous activity and habitability. The sedimentary fan extending from the Neretva Vallis breach of Jezero crater's western rim is one of the Mars 2020 Perseverance rover's main exploration targets. Perseverance spent ∼250 sols exploring and collecting seven rock cores from the lower ∼25 m of sedimentary rock exposed within the fan's eastern scarp, a sequence informally named the “Shenandoah” formation. This study describes the sedimentology and stratigraphy of the Shenandoah formation at two areas, “Cape Nukshak” and “Hawksbill Gap,” including a characterization, interpretation, and depositional framework for the facies that comprise it. The five main facies of the Shenandoah formation include: laminated mudstone, laminated sandstone, low-angle cross stratified sandstone, thin-bedded granule sandstone, and thick-bedded granule-pebble sandstone and conglomerate. These facies are organized into three facies associations (FA): FA1, comprised of laminated and soft sediment-deformed sandstone interbedded with broad, unconfined coarser-grained granule and pebbly sandstone intervals; FA2, comprised predominantly of laterally extensive, soft-sediment deformed laminated, sulfate-bearing mudstone with lenses of low-angle cross-stratified and scoured sandstone; and FA3, comprised of dipping planar, thin-bedded sand-gravel couplets. The depositional model favored for the Shenandoah formation involves the transition from a sand-dominated distal alluvial fan setting (FA1) to a stable, widespread saline lake (FA2), followed by the progradation of a river delta system (FA3) into the lake basin. This sequence records the initiation of a relatively long-lived, habitable lacustrine and deltaic environment within Jezero crater.

Published
2024

3. Sedimentology and Stratigraphy of the Shenandoah Formation, Western Fan, Jezero Crater, Mars

Author

Stack, K. M., primary, Ives, L. R. W., additional, Gupta, S., additional, Lamb, M. P., additional, Tebolt, M., additional, Caravaca, G., additional, Grotzinger, J. P., additional, Russell, P., additional, Shuster, D. L., additional, Williams, A. J., additional, Amundsen, H., additional, Alwmark, S., additional, Annex, A. M., additional, Barnes, R., additional, Bell, J., additional, Beyssac, O., additional, Bosak, T., additional, Crumpler, L. S., additional, Dehouck, E., additional, Gwizd, S. J., additional, Hickman‐Lewis, K., additional, Horgan, B. H. N., additional, Hurowitz, J., additional, Kalucha, H., additional, Kanine, O., additional, Lesh, C., additional, Maki, J., additional, Mangold, N., additional, Randazzo, N., additional, Seeger, C., additional, Williams, R. M. E., additional, Brown, A., additional, Cardarelli, E., additional, Dypvik, H., additional, Flannery, D., additional, Frydenvang, J., additional, Hamran, S.‐E., additional, Núñez, J. I., additional, Paige, D., additional, Simon, J. I., additional, Tice, M., additional, Tate, C., additional, and Wiens, R. C., additional

Published
2024
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6. In Situ Geologic Context Mapping Transect on the Floor of Jezero Crater From Mars 2020 Perseverance Rover Observations

Author

Crumpler, L. S., primary, Horgan, B. H. N., additional, Simon, J. I., additional, Stack, K. M., additional, Alwmark, S., additional, Dromart, G., additional, Wiens, R. C., additional, Udry, A., additional, Brown, A. J., additional, Russell, P., additional, Amundson, H. E. F., additional, Hamran, S.‐E., additional, Bell, J., additional, Shuster, D., additional, Calef, F. J., additional, Núñez, J., additional, Cohen, B. A., additional, Flannery, D., additional, Herd, C. D. K., additional, Hand, K. P., additional, Maki, J. N., additional, Schmidt, M., additional, Golombek, M. P., additional, and Williams, N. R., additional

Published
2023
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7. Samples Collected From the Floor of Jezero Crater With the Mars 2020 Perseverance Rover

Author

Simon, J. I., primary, Hickman‐Lewis, K., additional, Cohen, B. A., additional, Mayhew, L. E., additional, Shuster, D. L., additional, Debaille, V., additional, Hausrath, E. M., additional, Weiss, B. P., additional, Bosak, T., additional, Zorzano, M.‐P., additional, Amundsen, H. E. F., additional, Beegle, L. W., additional, Bell, J. F., additional, Benison, K. C., additional, Berger, E. L., additional, Beyssac, O., additional, Brown, A. J., additional, Calef, F., additional, Casademont, T. M., additional, Clark, B., additional, Clavé, E., additional, Crumpler, L., additional, Czaja, A. D., additional, Fairén, A. G., additional, Farley, K. A., additional, Flannery, D. T., additional, Fornaro, T., additional, Forni, O., additional, Gómez, F., additional, Goreva, Y., additional, Gorin, A., additional, Hand, K. P., additional, Hamran, S.‐E., additional, Henneke, J., additional, Herd, C. D. K., additional, Horgan, B. H. N., additional, Johnson, J. R., additional, Joseph, J., additional, Kronyak, R. E., additional, Madariaga, J. M., additional, Maki, J. N., additional, Mandon, L., additional, McCubbin, F. M., additional, McLennan, S. M., additional, Moeller, R. C., additional, Newman, C. E., additional, Núñez, J. I., additional, Pascuzzo, A. C., additional, Pedersen, D. A., additional, Poggiali, G., additional, Pinet, P., additional, Quantin‐Nataf, C., additional, Rice, M., additional, Rice, J. W., additional, Royer, C., additional, Schmidt, M., additional, Sephton, M., additional, Sharma, S., additional, Siljeström, S., additional, Stack, K. M., additional, Steele, A., additional, Sun, V. Z., additional, Udry, A., additional, VanBommel, S., additional, Wadhwa, M., additional, Wiens, R. C., additional, Williams, A. J., additional, and Williford, K. H., additional

Published
2023
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8. The Complex Exhumation History of Jezero Crater Floor Unit and Its Implication for Mars Sample Return

Author

Quantin‐Nataf, C., primary, Alwmark, S., additional, Calef, F. J., additional, Lasue, J., additional, Kinch, K., additional, Stack, K. M., additional, Sun, V., additional, Williams, N. R., additional, Dehouck, E., additional, Mandon, L., additional, Mangold, N., additional, Beyssac, O., additional, Clave, E., additional, Walter, S. H. G., additional, Simon, J. I., additional, Annex, A. M., additional, Horgan, B., additional, Rice, James W., additional, Shuster, D., additional, Cohen, B., additional, Kah, L., additional, Sholes, Steven, additional, and Weiss, B. P., additional

Published
2023
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9. In Situ Geologic Context Mapping Transect on the Floor of Jezero Crater from Mars 2020 Perseverance Rover Observations

Author

Crumpler, L. S., Horgan, B., Simon, J., Stack, K., Alwmark, S., Gilles, D., Wiens, R., Udry, A., Brown, A., Russell, P., Amundson, H., Hamran, S‐e., Bell, J., Shuster, D., Calef, F., Núñez, J., Cohen, B., Flannery, D., Herd, C. D. K., Hand, K., Maki, J., Schmidt, M., Golombek, M., Williams, N., Crumpler, L. S., Horgan, B., Simon, J., Stack, K., Alwmark, S., Gilles, D., Wiens, R., Udry, A., Brown, A., Russell, P., Amundson, H., Hamran, S‐e., Bell, J., Shuster, D., Calef, F., Núñez, J., Cohen, B., Flannery, D., Herd, C. D. K., Hand, K., Maki, J., Schmidt, M., Golombek, M., and Williams, N.

Abstract

In situ geologic context mapping (GXM) based on rover and helicopter observations provides documentation of a nearly continuous record of geology and exposed surface structure over a 120 m-wide corridor along the traverse of the Mars 2020 /Perseverance rover. The results record the geologic context of Mars 2020 campaign sites and sample sites including the local extent of bedrock outcrops, stratigraphy, attitude, and structure from imaging and rover-based remote sensing, and outcrop lithology based on in situ proximity science. Mapping identifies a sequence of igneous lithologies including: (1) early mafic, possibly intrusive, rocks; (2) pervasively fractured and deeply altered massive bedrock of undetermined protolith; (3) buried and exhumed lava flows with pahoehoe and aa textures; (4) several varieties of regolith; and (5) small impact craters.

Published
2023

10. The Complex Exhumation History of Jezero Crater Floor Unit and Its Implication for Mars Sample Return

Author

Quantin-Nataf, C., Alwmark, S., Calef, F. J., Lasue, J., Kinch, K., Stack, K. M., Sun, V., Williams, N. R., Dehouck, E., Mandon, L., Mangold, N., Beyssac, O., Clave, E., Walter, S. H.G., Simon, J. I., Annex, A. M., Horgan, B., Rice, James W., Shuster, D., Cohen, B., Kah, L., Sholes, Steven, Weiss, B. P., Quantin-Nataf, C., Alwmark, S., Calef, F. J., Lasue, J., Kinch, K., Stack, K. M., Sun, V., Williams, N. R., Dehouck, E., Mandon, L., Mangold, N., Beyssac, O., Clave, E., Walter, S. H.G., Simon, J. I., Annex, A. M., Horgan, B., Rice, James W., Shuster, D., Cohen, B., Kah, L., Sholes, Steven, and Weiss, B. P.

Abstract

During the first year of NASA's Mars 2020 mission, Perseverance rover has investigated the dark crater floor unit of Jezero crater and four samples of this unit have been collected. The focus of this paper is to assess the potential of these samples to calibrate the crater-based Martian chronology. We first review the previous estimation of crater-based model age of this unit. Then, we investigate the impact crater density distribution across the floor unit. It reveals that the crater density is heterogeneous from areas which have been exposed to the bombardment during the last 3 Ga to areas very recently exposed to bombardment. It suggests a complex history of exposure to impact cratering. We also display evidence of several remnants of deposits on the top of the dark floor unit across Jezero below which the dark floor unit may have been buried. We propose the following scenario of burying/exhumation: the dark floor unit would have been initially buried below a unit that was a few tens of meters thick. This unit then gradually eroded away due to Aeolian processes from the northeast to the west, resulting in uneven exposure to impact bombardment over 3 Ga. A cratering model reproducing this scenario confirms the feasibility of this hypothesis. Due to the complexity of its exposure history, the Jezero dark crater floor unit will require additional detailed analysis to understand how the Mars 2020 mission samples of the crater floor can be used to inform the Martian cratering chronology., During the first year of NASA's Mars 2020 mission, Perseverance rover has investigated the dark crater floor unit of Jezero crater and four samples of this unit have been collected. The focus of this paper is to assess the potential of these samples to calibrate the crater-based Martian chronology. We first review the previous estimation of crater-based model age of this unit. Then, we investigate the impact crater density distribution across the floor unit. It reveals that the crater density is heterogeneous from areas which have been exposed to the bombardment during the last 3 Ga to areas very recently exposed to bombardment. It suggests a complex history of exposure to impact cratering. We also display evidence of several remnants of deposits on the top of the dark floor unit across Jezero below which the dark floor unit may have been buried. We propose the following scenario of burying/exhumation: the dark floor unit would have been initially buried below a unit that was a few tens of meters thick. This unit then gradually eroded away due to Aeolian processes from the northeast to the west, resulting in uneven exposure to impact bombardment over 3 Ga. A cratering model reproducing this scenario confirms the feasibility of this hypothesis. Due to the complexity of its exposure history, the Jezero dark crater floor unit will require additional detailed analysis to understand how the Mars 2020 mission samples of the crater floor can be used to inform the Martian cratering chronology.

Published
2023

11. Seeking Signs of Life on Mars: the Importance of Sedimentary Suites as Part of a Mars Sample Return Campaign

Author

Mangold, N, McLennan, S. M, Czaja, A. D, Ori, G. G, Tosca, N. J, Altieri, F, Amelin, Y, Ammannito, E, Anand, M, Beaty, D. W, Benning, L. G, Bishop, J. L, Borg, L. E, Boucher, D, Brucato, J. R, Busemann, H, Campbell, K. A, Carrier, B. L, Debaille, V, Des Marais, D. J, Dixon, M, Ehlmann, B. L, Farmer, J. D, Fernandez-Remolar, D. C, Fogarty, J, Glavin, D. P, Goreva, Y. S, Grady, M. M, Hallis, L. J, Harrington, A. D, Hausrath, E. M, Herd, C. D. K, Horgan, B, Humayun, M, Kleine, T, Kleinhenz, J, Mackelprang, R, Mayhew, L. E, McCubbin, F. M, McCoy, J. T, McSween, H. Y, Moser, D. E, Moynier, F, Mustard, J. F, Niles, P. B, Raulin, F, Rettberg, P, Rucker, M. A, Schmitz, N, Sefton-Nash, E, Sephton, M. A, Shaheen, R, Shuster, D. L, Siljeström, S, Smith, C. L, Spry, J. A, Steele, A, Swindle, T. D, ten Kate, I. L, Usui, T, Van Kranendonk, M. J, Wadhwa, M, Weiss, B. P, Werner, S. C, Westall, F, Wheeler, R. M, Zipfel, J, and Zorzano, M. P

Subjects
Space Sciences (General)
Abstract

Seeking the signs of life on Mars is often considered the "first among equal" objectives for any potential Mars Sample Return (MSR) campaign. Among the geological settings considered to have the greatest potential for recording evidence of ancient life or its pre-biotic chemistry on Mars are lacustrine (and marine, if ever present) sedimentary depositional environments. This potential, and the possibility of returning samples that could meaningfully address this objective, have been greatly enhanced by investigations of an ancient redox stratified lake system in Gale crater by the Curiosity rover.

Published
2018

12. Seeking Signs of Life on Mars: A Strategy for Selecting and Analyzing Returned Samples from Hydrothermal Deposits

Author

Campbell, K. A, Farmer, J. D, Van Kranendonk, M. J, Fernandez-Remolar, D. C, Czaja, A. D, Altieri, F, Amelin, Y, Ammannito, E, Anand, M, Beaty, D. W, Benning, L. G, Bishop, J. L, Borg, L. E, Boucher, D, Brucato, J. R, Busemann, J. R, Carrier, B. L, Debaille, V, Des Marais, D. J, Dixon, M, Ehlmann, B. L, Fogarty, James T, Glavin, D. P, Goreva, Y. S, Grady, M. M, Hallis, L. J, Harrington, A. D, Hausrath, E. M, Herd, C. D. K, Horgan, B, Humayun, M, Kleine, T, Kleinhenz, J, Mangold, N, Mackelprang, R, Mayhew, L. E, McCubbin, F. M, Mccoy, Teresa R, McLennan, S. M, McSween, H. Y, Moser, D. E, Moynier, F, Mustard, J. F, Niles, P. B, Ori, G. G, Raulin, F, Rettberg, P, Rucker, Michelle A, Schmitz, N, Sefton-Nash, E, Sephton, M. A, Shaheen, R, Shuster, D. L, Siljestrom, S, Smith, C. L, Spry, J. A, Steele, A, Swindle, T. D, ten Kate, I. L, Tosca, N. J, Usui, T, Wadhwa, M, Weiss, B. P, Werner, S. C, Westall, F, Wheeler, R. M, Zipfel, J, and Zorzano, M. P

Subjects
Space Sciences (General)
Abstract

Highly promising locales for biosignature prospecting on Mars are ancient hydrothermal deposits, formed by the interaction of surface water with heat from volcanism or impacts. On Earth, they occur throughout the geological record (to at least approx. 3.5 Ga), preserving robust mineralogical, textural and compositional evidence of thermophilic microbial activity. Hydrothermal systems were likely present early in Mars' history, including at two of the three finalist candidate landing sites for M2020, Columbia Hills and NE Syrtis Major. Hydrothermal environments on Earth's surface are varied, constituting subaerial hot spring aprons, mounds and fumaroles; shallow to deep-sea hydrothermal vents (black and white smokers); and vent mounds and hot-spring discharges in lacustrine and fluvial settings. Biological information can be preserved by rapid, spring-sourced mineral precipitation, but also could be altered or destroyed by postdepositional events. Thus, field observations need to be followed by detailed laboratory analysis to verify potential biosignatures. See Attachment

Published
2018

13. An olivine cumulate outcrop on the floor of Jezero crater, Mars

Author

Liu, Y., primary, Tice, M. M., additional, Schmidt, M. E., additional, Treiman, A. H., additional, Kizovski, T. V., additional, Hurowitz, J. A., additional, Allwood, A. C., additional, Henneke, J., additional, Pedersen, D. A. K., additional, VanBommel, S. J., additional, Jones, M. W. M., additional, Knight, A. L., additional, Orenstein, B. J., additional, Clark, B. C., additional, Elam, W. T., additional, Heirwegh, C. M., additional, Barber, T., additional, Beegle, L. W., additional, Benzerara, K., additional, Bernard, S., additional, Beyssac, O., additional, Bosak, T., additional, Brown, A. J., additional, Cardarelli, E. L., additional, Catling, D. C., additional, Christian, J. R., additional, Cloutis, E. A., additional, Cohen, B. A., additional, Davidoff, S., additional, Fairén, A. G., additional, Farley, K. A., additional, Flannery, D. T., additional, Galvin, A., additional, Grotzinger, J. P., additional, Gupta, S., additional, Hall, J., additional, Herd, C. D. K., additional, Hickman-Lewis, K., additional, Hodyss, R. P., additional, Horgan, B. H. N., additional, Johnson, J. R., additional, Jørgensen, J. L., additional, Kah, L. C., additional, Maki, J. N., additional, Mandon, L., additional, Mangold, N., additional, McCubbin, F. M., additional, McLennan, S. M., additional, Moore, K., additional, Nachon, M., additional, Nemere, P., additional, Nothdurft, L. D., additional, Núñez, J. I., additional, O’Neil, L., additional, Quantin-Nataf, C. M., additional, Sautter, V., additional, Shuster, D. L., additional, Siebach, K. L., additional, Simon, J. I., additional, Sinclair, K. P., additional, Stack, K. M., additional, Steele, A., additional, Tarnas, J. D., additional, Tosca, N. J., additional, Uckert, K., additional, Udry, A., additional, Wade, L. A., additional, Weiss, B. P., additional, Wiens, R. C., additional, Williford, K. H., additional, and Zorzano, M.-P., additional

Published
2022
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14. Aqueously altered igneous rocks sampled on the floor of Jezero crater, Mars

Author

Farley, K. A., primary, Stack, K. M., additional, Shuster, D. L., additional, Horgan, B. H. N., additional, Hurowitz, J. A., additional, Tarnas, J. D., additional, Simon, J. I., additional, Sun, V. Z., additional, Scheller, E. L., additional, Moore, K. R., additional, McLennan, S. M., additional, Vasconcelos, P. M., additional, Wiens, R. C., additional, Treiman, A. H., additional, Mayhew, L. E., additional, Beyssac, O., additional, Kizovski, T. V., additional, Tosca, N. J., additional, Williford, K. H., additional, Crumpler, L. S., additional, Beegle, L. W., additional, Bell, J. F., additional, Ehlmann, B. L., additional, Liu, Y., additional, Maki, J. N., additional, Schmidt, M. E., additional, Allwood, A. C., additional, Amundsen, H. E. F., additional, Bhartia, R., additional, Bosak, T., additional, Brown, A. J., additional, Clark, B. C., additional, Cousin, A., additional, Forni, O., additional, Gabriel, T. S. J., additional, Goreva, Y., additional, Gupta, S., additional, Hamran, S.-E., additional, Herd, C. D. K., additional, Hickman-Lewis, K., additional, Johnson, J. R., additional, Kah, L. C., additional, Kelemen, P. B., additional, Kinch, K. B., additional, Mandon, L., additional, Mangold, N., additional, Quantin-Nataf, C., additional, Rice, M. S., additional, Russell, P. S., additional, Sharma, S., additional, Siljeström, S., additional, Steele, A., additional, Sullivan, R., additional, Wadhwa, M., additional, Weiss, B. P., additional, Williams, A. J., additional, Wogsland, B. V., additional, Willis, P. A., additional, Acosta-Maeda, T. A., additional, Beck, P., additional, Benzerara, K., additional, Bernard, S., additional, Burton, A. S., additional, Cardarelli, E. L., additional, Chide, B., additional, Clavé, E., additional, Cloutis, E. A., additional, Cohen, B. A., additional, Czaja, A. D., additional, Debaille, V., additional, Dehouck, E., additional, Fairén, A. G., additional, Flannery, D. T., additional, Fleron, S. Z., additional, Fouchet, T., additional, Frydenvang, J., additional, Garczynski, B. J., additional, Gibbons, E. F., additional, Hausrath, E. M., additional, Hayes, A. G., additional, Henneke, J., additional, Jørgensen, J. L., additional, Kelly, E. M., additional, Lasue, J., additional, Le Mouélic, S., additional, Madariaga, J. M., additional, Maurice, S., additional, Merusi, M., additional, Meslin, P.-Y., additional, Milkovich, S. M., additional, Million, C. C., additional, Moeller, R. C., additional, Núñez, J. I., additional, Ollila, A. M., additional, Paar, G., additional, Paige, D. A., additional, Pedersen, D. A. K., additional, Pilleri, P., additional, Pilorget, C., additional, Pinet, P. C., additional, Rice, J. W., additional, Royer, C., additional, Sautter, V., additional, Schulte, M., additional, Sephton, M. A., additional, Sharma, S. K., additional, Sholes, S. F., additional, Spanovich, N., additional, St. Clair, M., additional, Tate, C. D., additional, Uckert, K., additional, VanBommel, S. J., additional, Yanchilina, A. G., additional, and Zorzano, M.-P., additional

Published
2022
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15. SIGNIFICANCE OF THE VARIATIONS IN FLUVIAL INPUT WITHIN JEZERO CRATER FROM PERSEVERANCE ROVER OBSERVATIONS

Author

Nicolas Mangold, Sanjeev Gupta, Gwénaël CARAVACA, Olivier Gasnault, Gilles Dromart, Tarnas, J., Sholes, S., Horgan, B., Cathy Quantin-Nataf, Brown, A., Stéphane Le Mouélic, Yingst, R., Bell, J., Olivier Beyssac, Bosak, T., Calef, F., Ehlmann, B., Farley, K., Grotzinger, J., Hickman- Lewis, K., Holm-Alwmark, S., Kah, L., Martinez-Frias, J., Mclennan, S., Maurice, S., Nuñez, J., Ollila, A., Pilleri, P., Rice, J., Rice, M., Simon, J., Shuster, D., Stack, K., Sun, V., Treiman, A., Weiss, B., Wiens, R., Williams, A., Williams, N., Williford, K., Laboratoire de Planétologie et Géosciences [UMR_C 6112] (LPG), Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST), Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Department of Earth Science and Engineering [Imperial College London], Imperial College London, Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Purdue University [West Lafayette], Plancius Research LLC, Planetary Science Institute [Tucson] (PSI), Arizona State University [Tempe] (ASU), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Massachusetts Institute of Technology (MIT), California Institute of Technology (CALTECH), The Natural History Museum [London] (NHM), Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Niels Bohr Institute [Copenhagen] (NBI), Faculty of Science [Copenhagen], University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH), Lund University [Lund], Natural History Museum of Denmark, Department of Earth and Planetary Sciences [Knoxville], The University of Tennessee [Knoxville], Instituto de Geociencias [Madrid] (IGEO), Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Department of Geosciences [Stony Brook], Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY), JHUAPL, Los Alamos National Laboratory (LANL), College of Science & Engineering (College of Science & Engineering), University of Texas at Austin [Austin], Astromaterials Research and Exploration Science (ARES), NASA Johnson Space Center (JSC), NASA-NASA, University of California [Berkeley] (UC Berkeley), University of California (UC), Lunar and Planetary Institute [Houston] (LPI), Department of Geological Sciences [Gainesville] (UF|Geological), University of Florida [Gainesville] (UF), and Lunar and Planetary Institute

Subjects
Jezero crater, delta, [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology, [SDU]Sciences of the Universe [physics], [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, Mars 2020, Mars, sedimentology, stratigraphy, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Abstract

International audience; The Perseverance rover landed on the floor of Jezero crater on 18 February 2021. The landing site, named “Octavia E. Butler” is located ~2.2 km from the SE-facing erosional scarp of the western fan deposits, which are of strong interest for the mission [1-2]. Images obtained using the Mastcam-Z camera and the Remote Micro-Imager (RMI) of the SuperCam instrument provided the first Mars ground-based observations of this western fan (Fig. 1). At the distance images were taken, the RMI images offer a pixel resolution of 2.2 cm, thus enabling identification of objects of typically 7-8 cm (3-4 pixels). Observations of the residual butte Kodiak confirmed the presence of a lake within Jezero crater, but also showed that the lake deduced from the deltaic architecture at Kodiak had a level ~100 m lower than expected (-2495/-2500 m), and was thus a closed system for a significant period [3]. In addition, the coarser deposits (boulder conglomerates and pebbly sandstones) observed near the top of all of the scarps are typical of fluvial floods with high energy, reflecting a change in hydrology of the fluvial system. Here, we focus on the hydrological characteristics of fluvial deposits observed within the scarps of the delta, both as topsets and as boulder conglomerates.

Published
2022

16. A DELTA-LAKE SYSTEM AT JEZERO CRATER (MARS) FROM LONG DISTANCE OBSERVATIONS

Author

Sanjeev Gupta, Nicolas Mangold, Bell, Jim F., Olivier Gasnault, Tarnas, J. D., Sholes, S., Briony Horgan, Cathy Quantin-Nataf, Brown, A., Stéphane Le Mouélic, Roberta Yingst, Olivier Beyssac, Bosak, T., Fred Calef, Gwénaël CARAVACA, Ehlmann, B., Kenneth Farley, Grotzinger, John P., Hickman-Lewis, K., Holm-Alwmark, S., Kah, Linda C., Kanine, M., Martinez-Frias, J., Mclennan, Scott M., Sylvestre Maurice, Nuñez, J., Ollila, A. M., Gerhard Paar, Paolo Pilleri, Rice, J., Rice, M., Simon, J., Shuster, D., Katie Stack‐morgan, Vivian Sun, Treiman, Allan H., Weiss, B., Wiens, Roger C., Williams, A., Williams, N., Williford, Kenneth H., Department of Earth Science and Engineering [Imperial College London], Imperial College London, Laboratoire de Planétologie et Géosciences [UMR_C 6112] (LPG), Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST), Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Arizona State University [Tempe] (ASU), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Purdue University [West Lafayette], Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Plancius Research LLC, Planetary Science Institute [Tucson] (PSI), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Massachusetts Institute of Technology (MIT), California Institute of Technology (CALTECH), The Natural History Museum [London] (NHM), Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Niels Bohr Institute [Copenhagen] (NBI), Faculty of Science [Copenhagen], University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH), Lund University [Lund], Natural History Museum of Denmark, The University of Tennessee [Knoxville], Instituto de Geociencias [Madrid] (IGEO), Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Department of Geosciences [Stony Brook], Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY), JHUAPL, Los Alamos National Laboratory (LANL), Joanneum Research, College of Engineering and Science [Louisiana], Louisiana Tech University, Astromaterials Research and Exploration Science (ARES), NASA Johnson Space Center (JSC), NASA-NASA, Department of Earth and Planetary Science [UC Berkeley] (EPS), University of California [Berkeley] (UC Berkeley), University of California (UC)-University of California (UC), Lunar and Planetary Institute [Houston] (LPI), Department of Geological Sciences [Gainesville] (UF|Geological), University of Florida [Gainesville] (UF), and Lunar and Planetary Institute

Subjects
Jezero crater, delta, [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology, [SDU]Sciences of the Universe [physics], [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, Mars 2020, Mars, sedimentolgoy, stratigraphy, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Abstract

International audience; Orbital and rover observations of relictgeomorphic features and stratigraphic architectures indicate Mars once had a warmer, wetter climate. Constraining the character, relative timing and persistence of ancient aqueous activity on Mars is possible through detailed interrogation of the stratal geometry of aqueously deposited sedimentary bodies. Such analyses inform interpretations of Martian climate evolution, potential habitability, and search strategies for rocks that might contain potential biosignatures. A prominent sedimentary fan deposit at the westernmargin of Jezero crater has been inferred to be a river delta that built into an ancient lake basin during the Late Noachian-Early Hesperian epochs on Mars (~3.6-3.8 Ga) [1, 2, 3]. The Perseverance rover landed on 18 February 2021 ~2.2 km from the western fan. During the early phase of mission investigations, highresolution images obtained from the Mastcam-Z camera and from the Remote Micro-Imager of the SuperCaminstrument provided the first ground-based observations of the western fan and an associated remnant outcrop, named Kodiak. Here, we report its sedimentology, which provide new constraints on the nature of the fan deposits, and their paleoenvironmental implications (4).

Published
2022

17. Highly Differentiated Basaltic Lavas Examined by PIXL in Jezero Crater

Author

Schmidt, M. E., Allwood, A., Christian, J., Clark, B., Flannery, David, Hennecke, J., Herd, C. D. K., Hurowitz, J. A., Kizovski, Tanya V., Liu, Y., McLennan, S. M., Nachon, Marion, Pedersen, D. A. K., Shuster, D. L., Simon, J. I., Tice, M., Tosca, Nicholas, Treiman, A. H., Udry, Arya, Van Bommel, Scott, Wadhwa, Meenakshi, Schmidt, M. E., Allwood, A., Christian, J., Clark, B., Flannery, David, Hennecke, J., Herd, C. D. K., Hurowitz, J. A., Kizovski, Tanya V., Liu, Y., McLennan, S. M., Nachon, Marion, Pedersen, D. A. K., Shuster, D. L., Simon, J. I., Tice, M., Tosca, Nicholas, Treiman, A. H., Udry, Arya, Van Bommel, Scott, and Wadhwa, Meenakshi

Abstract

Textural, bulk chemical, and mineralogical data collected by PIXL (Planetary Instrument for X-ray Lithochemistry) indicate that the first rock unit (Cf-fr, Crater Floor-Fractured rough) examined by the M2020 Perseverance rover in Jezero crater is from a basaltic lava flow. This unit was originally mapped as volcanic flow [1] but has been reinterpreted as a clastic or volcaniclastic sediment [2]. We here present evidence that it is a basalt flow, with implications for its petrogenesis as a highly differentiated basalt.

Published
2022

18. Aqueously altered igneous rocks sampled on the floor of Jezero crater, Mars

Author

Farley, K A, Stack, K M, Shuster, D L, Horgan, B H N, Hurowitz, J A, Tarnas, J D, Simon, J I, Sun, V Z, Scheller, E L, Moore, K R, McLennan, S M, Vasconcelos, P M, Wiens, R C, Treiman, A H, Mayhew, L E, Beyssac, O, Kizovski, T V, Tosca, N J, Williford, K H, Crumpler, L S, Beegle, L W, Bell, J F, Ehlmann, B L, Liu, Y, Maki, J N, Schmidt, M E, Allwood, A C, Amundsen, H E F, Bhartia, R, Bosak, T, Brown, A J, Clark, B C, Cousin, A, Forni, O, Gabriel, T S J, Goreva, Y, Gupta, S, Hamran, S-E, Herd, C D K, Hickman-Lewis, K, Johnson, J R, Kah, L C, Kelemen, P B, Kinch, K B, Mandon, L, Mangold, N, Quantin-Nataf, C, Rice, M S, Russell, P S, Sharma, S K, Siljeström, S, Steele, A, Sullivan, R, Wadhwa, M, Weiss, B P, Williams, A J, Wogsland, B V, Willis, P A, Acosta-Maeda, T A, Beck, P, Benzerara, K, Bernard, S, Burton, A S, Cardarelli, E L, Chide, B, Clavé, E, Cloutis, E A, Cohen, B A, Czaja, A D, Debaille, V, Dehouck, E, Fairén, A G, Flannery, D T, Fleron, S Z, Fouchet, T, Frydenvang, J, Garczynski, B J, Gibbons, E F, Hausrath, E M, Hayes, A G, Henneke, J, Jørgensen, J L, Kelly, E M, Lasue, J, Le Mouélic, S, Madariaga, J M, Maurice, S, Merusi, M, Meslin, P-Y, Milkovich, S M, Million, C C, Moeller, R C, Núñez, J I, Ollila, A M, Paar, G, Paige, D A, Pedersen, D A K, Pilleri, P, Pilorget, C, Pinet, P C, Rice, J W, Royer, C, Sautter, V, Schulte, M, Sephton, M A, Sholes, S F, Spanovich, N, St Clair, M, Tate, C D, Uckert, K, VanBommel, S J, Yanchilina, A G, Zorzano, M-P, Farley, K A, Stack, K M, Shuster, D L, Horgan, B H N, Hurowitz, J A, Tarnas, J D, Simon, J I, Sun, V Z, Scheller, E L, Moore, K R, McLennan, S M, Vasconcelos, P M, Wiens, R C, Treiman, A H, Mayhew, L E, Beyssac, O, Kizovski, T V, Tosca, N J, Williford, K H, Crumpler, L S, Beegle, L W, Bell, J F, Ehlmann, B L, Liu, Y, Maki, J N, Schmidt, M E, Allwood, A C, Amundsen, H E F, Bhartia, R, Bosak, T, Brown, A J, Clark, B C, Cousin, A, Forni, O, Gabriel, T S J, Goreva, Y, Gupta, S, Hamran, S-E, Herd, C D K, Hickman-Lewis, K, Johnson, J R, Kah, L C, Kelemen, P B, Kinch, K B, Mandon, L, Mangold, N, Quantin-Nataf, C, Rice, M S, Russell, P S, Sharma, S K, Siljeström, S, Steele, A, Sullivan, R, Wadhwa, M, Weiss, B P, Williams, A J, Wogsland, B V, Willis, P A, Acosta-Maeda, T A, Beck, P, Benzerara, K, Bernard, S, Burton, A S, Cardarelli, E L, Chide, B, Clavé, E, Cloutis, E A, Cohen, B A, Czaja, A D, Debaille, V, Dehouck, E, Fairén, A G, Flannery, D T, Fleron, S Z, Fouchet, T, Frydenvang, J, Garczynski, B J, Gibbons, E F, Hausrath, E M, Hayes, A G, Henneke, J, Jørgensen, J L, Kelly, E M, Lasue, J, Le Mouélic, S, Madariaga, J M, Maurice, S, Merusi, M, Meslin, P-Y, Milkovich, S M, Million, C C, Moeller, R C, Núñez, J I, Ollila, A M, Paar, G, Paige, D A, Pedersen, D A K, Pilleri, P, Pilorget, C, Pinet, P C, Rice, J W, Royer, C, Sautter, V, Schulte, M, Sephton, M A, Sholes, S F, Spanovich, N, St Clair, M, Tate, C D, Uckert, K, VanBommel, S J, Yanchilina, A G, and Zorzano, M-P

Abstract

The Perseverance rover landed in Jezero crater, Mars, to investigate ancient lake and river deposits. We report observations of the crater floor, below the crater’s sedimentary delta, finding the floor consists of igneous rocks altered by water. The lowest exposed unit, informally named Séítah, is a coarsely crystalline olivine-rich rock, which accumulated at the base of a magma body. Fe-Mg carbonates along grain boundaries indicate reactions with CO2-rich water, under water-poor conditions. Overlying Séítah is a unit informally named Máaz, which we interpret as lava flows or the chemical complement to Séítah in a layered igneous body. Voids in these rocks contain sulfates and perchlorates, likely introduced by later near-surface brine evaporation. Core samples of these rocks were stored aboard Perseverance for potential return to Earth.

Published
2022

19. Exhumation signals and forcing mechanisms in the Southern Patagonian Andes (Torres del Paine and Fitz Roy plutonic complexes)

Author

Paiva Muller, V, Sue, C, Valla, P, Sternai, P, Simon-Labric, T, Martinod, J, Ghiglione, M, Baumgartner, L, Herman, F, Reiners, P, Gautheron, C, Grujic, D, Shuster, D, Braun, J, Paiva Muller, VA, Paiva Muller, V, Sue, C, Valla, P, Sternai, P, Simon-Labric, T, Martinod, J, Ghiglione, M, Baumgartner, L, Herman, F, Reiners, P, Gautheron, C, Grujic, D, Shuster, D, Braun, J, and Paiva Muller, VA

Abstract

Late Miocene calc-alkaline intrusions in the back-arc of Southern Patagonia mark an eastward migration of the arc due to accelerated subduction velocity of the Nazca plate or slab flattening preceding active ridge subduction. Amongst these intrusions are the emblematic Torres del Paine (51°S) and Fitz Roy (49°S) plutonic complexes, crystalised at ca. 12.5 and ca. 16.5 Ma, respectively (Leuthold et al., 2012; Ramírez de Arellano et al., 2012). Both intrusions are located at the eastern boundary of the Southern Patagonian Icefield and form prominent peaks with steep slopes that are ~3 km higher in elevation than the surrounding low-relief foreland. Their exhumation has been proposed as a response to glacial erosion and associated glacial rebound since ca. 7 Ma (Fosdick et al., 2013), and/or by regional dynamic uplift between 14 and 6 Ma due to the northward migration of subducting spreading ridges (Guillaume et al., 2009). Here we present a new data set of apatite and zircon (U-Th)/He from both plutonic complexes, numerically modelled to unravel their late-Neogene to Quaternary thermal histories. Our results show three rapid cooling periods for the Fitz Roy intrusion: at ca. 9.5 Ma, at ca. 7.5 Ma, and since ca. 1 Ma. For Torres del Paine, inverse thermal modelling reveals short and rapid cooling at ca. 6.5 Ma followed by late-Quaternary final cooling. The 10 Ma cooling signal only evidenced in the northern plutonic complex (Fitz Roy) may represent an exhumation response to the northward migrating subduction of spreading ridge segments, causing localized dynamic uplift. Thus, the absence of exhumation signal before 6.5 Ma in the southern part (Torres del Paine) suggest that the spreading ridge subduction must have occurred before its 12.5 Ma emplacement. On the other hand, rapid cooling by similar magnitude in both plutonic complexes between ca. 7.5–6.5 Ma, likely reflects the onset of late-Cenozoic glaciations in Southern Patagonia. Finally, the late-stage Quaternary

Published
2022

20. Aqueously altered igneous rocks sampled on the floor of Jezero crater, Mars

Author

Farley, K. A., Stack, K. M., Shuster, D. L., Horgan, B. H. N., Hurowitz, J. A., Tarnas, J. D., Simon, J. I., Sun, V. Z., Scheller, E. L., Moore, K. R., McLennan, S. M., Vasconcelos, P. M., Wiens, R. C., Treiman, A. H., Mayhew, L. E., Beyssac, O., Kizovski, T. V., Tosca, N. J., Williford, K. H., Crumpler, L. S., Beegle, L. W., Bell, J. F., Ehlmann, B. L., Liu, Y., Maki, J. N., Schmidt, M. E., Allwood, A. C., Amundsen, H. E. F., Bhartia, R., Bosak, T., Brown, A. J., Clark, B. C., Cousin, A., Forni, O., Gabriel, T. S. J., Goreva, Y., Gupta, S., Hamran, S.-E., Herd, C. D. K., Hickman-Lewis, K., Johnson, J. R., Kah, L. C., Kelemen, P. B., Kinch, K. B., Mandon, L., Mangold, N., Quantin-Nataf, C., Rice, M. S., Russell, P. S., Sharma, S., Siljeström, S., Steele, A., Sullivan, R., Wadhwa, M., Weiss, B. P., Williams, A. J., Wogsland, B. V., Willis, P. A., Acosta-Maeda, T. A., Beck, P., Benzerara, K., Bernard, S., Burton, A. S., Cardarelli, E. L., Chide, B., Clavé, E., Cloutis, E. A., Cohen, B. A., Czaja, A. D., Debaille, V., Dehouck, E., Fairén, A. G., Flannery, D. T., Fleron, S. Z., Fouchet, T., Frydenvang, J., Garczynski, B. J., Gibbons, E. F., Hausrath, E. M., Hayes, A. G., Henneke, J., Jørgensen, J. L., Kelly, E. M., Lasue, J., Le Mouélic, S., Madariaga, J. M., Maurice, S., Merusi, M., Meslin, P.-Y., Milkovich, S. M., Million, C. C., Moeller, R. C., Nuñez, J. I., Ollila, A. M., Paar, G., Paige, D. A., Pedersen, D. A. K., Pilleri, P., Pilorget, C., Pinet, P. C., Rice, J. W., Royer, C., Sautter, V., Schulte, M., Sephton, M. A., Sharma, S. K., Sholes, S. F., Spanovich, N., Clair, M. St., Tate, C. D., Uckert, K., VanBommel, S. J., Yanchilina, A. G., Zorzano, M.-P., Farley, K. A., Stack, K. M., Shuster, D. L., Horgan, B. H. N., Hurowitz, J. A., Tarnas, J. D., Simon, J. I., Sun, V. Z., Scheller, E. L., Moore, K. R., McLennan, S. M., Vasconcelos, P. M., Wiens, R. C., Treiman, A. H., Mayhew, L. E., Beyssac, O., Kizovski, T. V., Tosca, N. J., Williford, K. H., Crumpler, L. S., Beegle, L. W., Bell, J. F., Ehlmann, B. L., Liu, Y., Maki, J. N., Schmidt, M. E., Allwood, A. C., Amundsen, H. E. F., Bhartia, R., Bosak, T., Brown, A. J., Clark, B. C., Cousin, A., Forni, O., Gabriel, T. S. J., Goreva, Y., Gupta, S., Hamran, S.-E., Herd, C. D. K., Hickman-Lewis, K., Johnson, J. R., Kah, L. C., Kelemen, P. B., Kinch, K. B., Mandon, L., Mangold, N., Quantin-Nataf, C., Rice, M. S., Russell, P. S., Sharma, S., Siljeström, S., Steele, A., Sullivan, R., Wadhwa, M., Weiss, B. P., Williams, A. J., Wogsland, B. V., Willis, P. A., Acosta-Maeda, T. A., Beck, P., Benzerara, K., Bernard, S., Burton, A. S., Cardarelli, E. L., Chide, B., Clavé, E., Cloutis, E. A., Cohen, B. A., Czaja, A. D., Debaille, V., Dehouck, E., Fairén, A. G., Flannery, D. T., Fleron, S. Z., Fouchet, T., Frydenvang, J., Garczynski, B. J., Gibbons, E. F., Hausrath, E. M., Hayes, A. G., Henneke, J., Jørgensen, J. L., Kelly, E. M., Lasue, J., Le Mouélic, S., Madariaga, J. M., Maurice, S., Merusi, M., Meslin, P.-Y., Milkovich, S. M., Million, C. C., Moeller, R. C., Nuñez, J. I., Ollila, A. M., Paar, G., Paige, D. A., Pedersen, D. A. K., Pilleri, P., Pilorget, C., Pinet, P. C., Rice, J. W., Royer, C., Sautter, V., Schulte, M., Sephton, M. A., Sharma, S. K., Sholes, S. F., Spanovich, N., Clair, M. St., Tate, C. D., Uckert, K., VanBommel, S. J., Yanchilina, A. G., and Zorzano, M.-P.

Abstract

The Perseverance rover landed in Jezero crater, Mars, to investigate ancient lake and river deposits. We report observations of the crater floor, below the crater's sedimentary delta, finding that the floor consists of igneous rocks altered by water. The lowest exposed unit, informally named Seitah, is a coarsely crystalline olivine-rich rock, which accumulated at the base of a magma body. Magnesium-iron carbonates along grain boundaries indicate reactions with carbon dioxide-rich water under water-poor conditions. Overlying Seitah is a unit informally named Maaz, which we interpret as lava flows or the chemical complement to Seitah in a layered igneous body. Voids in these rocks contain sulfates and perchlorates, likely introduced by later near-surface brine evaporation. Core samples of these rocks have been stored aboard Perseverance for potential return to Earth.

Published
2022

21. Perseverance rover reveals an ancient delta-lake system and flood deposits at Jezero crater, Mars

Author

Mangold, N., primary, Gupta, S., additional, Gasnault, O., additional, Dromart, G., additional, Tarnas, J. D., additional, Sholes, S. F., additional, Horgan, B., additional, Quantin-Nataf, C., additional, Brown, A. J., additional, Le Mouélic, S., additional, Yingst, R. A., additional, Bell, J. F., additional, Beyssac, O., additional, Bosak, T., additional, Calef, F., additional, Ehlmann, B. L., additional, Farley, K. A., additional, Grotzinger, J. P., additional, Hickman-Lewis, K., additional, Holm-Alwmark, S., additional, Kah, L. C., additional, Martinez-Frias, J., additional, McLennan, S. M., additional, Maurice, S., additional, Nuñez, J. I., additional, Ollila, A. M., additional, Pilleri, P., additional, Rice, J. W., additional, Rice, M., additional, Simon, J. I., additional, Shuster, D. L., additional, Stack, K. M., additional, Sun, V. Z., additional, Treiman, A. H., additional, Weiss, B. P., additional, Wiens, R. C., additional, Williams, A. J., additional, Williams, N. R., additional, and Williford, K. H., additional

Published
2021
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22. Perseverance rover reveals an ancient delta-lake system and flood deposits at Jezero crater, Mars

Author

Mangold, N., Gupta, S., Gasnault, O., Dromart, G., Tarnas, J. D., Sholes, S. F., Horgan, B., Quantin-Nataf, C., Brown, A. J., Le Mouélic, S., Yingst, R., Bell, J. F., Beyssac, O., Bosak, T., Calef, F., III, Ehlmann, B. L., Farley, K. A., Grotzinger, J. P., Hickman-Lewis, K., Holm-Alwmark, S., Kah, L. C., Martínez-Frías, J., McLennan, S. M., Maurice, S., Nuñez, J. I., Ollila, A. M., Pilleri, P., Rice, J. W., Jr., Rice, M., Simon, J. I., Shuster, D. L., Stack, K. M., Sun, V. Z., Treiman, A. H., Weiss, B. P., Wiens, R. C., Williams, A. J., Williams, N. R., Williford, K. H., Mangold, N., Gupta, S., Gasnault, O., Dromart, G., Tarnas, J. D., Sholes, S. F., Horgan, B., Quantin-Nataf, C., Brown, A. J., Le Mouélic, S., Yingst, R., Bell, J. F., Beyssac, O., Bosak, T., Calef, F., III, Ehlmann, B. L., Farley, K. A., Grotzinger, J. P., Hickman-Lewis, K., Holm-Alwmark, S., Kah, L. C., Martínez-Frías, J., McLennan, S. M., Maurice, S., Nuñez, J. I., Ollila, A. M., Pilleri, P., Rice, J. W., Jr., Rice, M., Simon, J. I., Shuster, D. L., Stack, K. M., Sun, V. Z., Treiman, A. H., Weiss, B. P., Wiens, R. C., Williams, A. J., Williams, N. R., and Williford, K. H.

Abstract

Observations from orbital spacecraft have shown that Jezero crater, Mars, contains a prominent fan-shaped body of sedimentary rock deposited at its western margin. The Perseverance rover landed in Jezero crater in February 2021. We analyze images taken by the rover in the three months after landing. The fan has outcrop faces that were invisible from orbit, which record the hydrological evolution of Jezero crater. We interpret the presence of inclined strata in these outcrops as evidence of deltas that advanced into a lake. In contrast, the uppermost fan strata are composed of boulder conglomerates, which imply deposition by episodic high-energy floods. This sedimentary succession indicates a transition, from a sustained hydrologic activity in a persistent lake environment, to highly energetic short-duration fluvial flows.

Published
2021

23. Pexidartinib improves physical functioning and stiffness in patients with tenosynovial giant cell tumor: results from the ENLIVEN randomized clinical trial

Author

van de Sande, M, Tap, WD, Gelhorn, HL, Ye, X, Speck, RM, Palmerini, E, Stacchiotti, S, Desai, J, Wagner, AJ, Alcindor, T, Ganjoo, K, Martin-Broto, J, Wang, Q, Shuster, D, Gelderblom, H, Healey, JH, van de Sande, M, Tap, WD, Gelhorn, HL, Ye, X, Speck, RM, Palmerini, E, Stacchiotti, S, Desai, J, Wagner, AJ, Alcindor, T, Ganjoo, K, Martin-Broto, J, Wang, Q, Shuster, D, Gelderblom, H, and Healey, JH

Abstract

Background and purpose - The ENLIVEN trial showed that, after 25 weeks, pexidartinib statistically significantly reduced tumor size more than placebo in patients with symptomatic, advanced tenosynovial giant cell tumor (TGCT) for whom surgery was not recommended. Here, we detail the effect of pexidartinib on patient-reported physical function and stiffness in ENLIVEN.Patients and methods - This was a planned analysis of patient-reported outcome data from ENLIVEN, a double-blinded, randomized phase 3 trial of adults with symptomatic, advanced TGCT treated with pexidartinib or placebo. Physical function was assessed using the Patient-Reported Outcomes Measurement Information System (PROMIS)-physical function (PF), and worst stiffness was assessed using a numerical rating scale (NRS). A mixed model for repeated measures was used to compare changes in PROMIS-PF and worst stiffness NRS scores from baseline to week 25 between treatment groups. Response rates for the PROMIS-PF and worst stiffness NRS at week 25 were calculated based on threshold estimates from reliable change index and anchor-based methods.Results - Between baseline and week 25, greater improvements in physical function and stiffness were experienced by patients receiving pexidartinib than patients receiving placebo (change in PROMIS-PF = 4.1 [95% confidence interval (CI) 1.8-6.3] vs. -0.9 [CI -3.0 to 1.2]; change in worst stiffness NRS = -2.5 [CI -3.0 to -1.9] vs. -0.3 [CI -0.9 to 0.3]). Patients receiving pexidartinib had higher response rates than patients receiving placebo for meaningful improvements in physical function and stiffness. Improvements were sustained after 50 weeks of pexidartinib treatment.Interpretation - Pexidartinib treatment provided sustained, meaningful improvements in physical function and stiffness for patients with symptomatic, advanced TGCT.

Published
2021

26. The Potential Science and Engineering Value of Samples Delivered to Earth by Mars Sample Return - Final Report (white paper)

Author

International MSR Objectives and Samples Team, iMOST, Beaty, D. W., Grady, M. M., McSween, H. Y., Sefton-Nash, E., Carrier, B. L., Altieri, F., Amelin, Y., Ammannito, E., Anand, M., Benning, L. G., Bishop, J. L., Borg, L. E., Boucher, D., Brucato, J. R., Busemann, H., Campbell, K. A., Czaja, A. D., Debaille, V., Des Marais, D. J., Dixon, M., Ehlmann, B. L., Farmer, J. D., Fernandez-Remolar, D. C., Filiberto, J., Fogarty, J., Glavin, D. P., Goreva, Y. S., Hallis, L. J., Harrington, A. D., Hausrath, E. M., Herd, C. D. K., Horgan, B., Humayun, M., Kleine, T., Kleinhenz, J., Mackelprang, R., Mangold, N., Mayhew, L. E., McCoy, J. T., McCubbin, F. M., McLennan, S. M., Moser, D. E., Moynier, F., Mustard, J. F., Niles, P. B., Ori, G. G., Raulin, F., Rettberg, Petra, Rucker, M. A., Schmitz, N., Schwenzer, S. P., Sephton, M. A., Shaheen, R., Sharp, Z. D., Shuster, D. L., Siljeström, S., Smith, C. L., Spry, J. A., Steele, A., Swindle, T. D., ten Kate, I. L., Tosca, N. J., Usui, T., Van Kranendonk, M. J., Wadhwa, M., Weiss, B. P., Werner, S. C., Westall, F., Wheeler, R. M., Zipfel, J., Zorzano, M. P., co-chair: Beaty, D. W., co-chair: Grady, M. M., co-chair: McSween, H. Y., co-chair: Sefton-Nash, E., documentarian: Carrier, B.L., and plus 66 co-authors, .

Subjects
Strahlenbiologie, Mars sample return, iMOST
Abstract

Executive Summary: Return of samples from the surface of Mars has been a goal of the international Mars science community for many years. Affirmation by NASA and ESA of the importance of Mars exploration led the agencies to establish the international MSR Objectives and Samples Team (iMOST). The purpose of the team is to re-evaluate and update the sample-related science and engineering objectives of a Mars Sample Return (MSR) campaign. The iMOST team has also undertaken to define the measurements and the types of samples that can best address the objectives. Seven objectives have been defined for MSR, traceable through two decades of previously published international priorities. The first two objectives are further divided into sub-objectives. Within the main part of the report, the importance to science and/or engineering of each objective is described, critical measurements that would address the objectives are specified, and the kinds of samples that would be most likely to carry key information are identified. These seven objectives provide a framework for demonstrating how the first set of returned martian samples would impact future martian science and exploration. They also have implications for how analogous investigations might be conducted for samples returned by future missions from other solar system bodies, especially those that may harbor biologically relevant or sensitive material, such as Ocean Worlds (Europa, Enceladus, Titan) and others.

Published
2018

27. The potential science and engineering value of samples delivered to Earth by Mars sample return

Author

Beaty, D. W., primary, Grady, M. M., additional, McSween, H. Y., additional, Sefton‐Nash, E., additional, Carrier, B. L., additional, Altieri, F., additional, Amelin, Y., additional, Ammannito, E., additional, Anand, M., additional, Benning, L. G., additional, Bishop, J. L., additional, Borg, L. E., additional, Boucher, D., additional, Brucato, J. R., additional, Busemann, H., additional, Campbell, K. A., additional, Czaja, A. D., additional, Debaille, V., additional, Des Marais, D. J., additional, Dixon, M., additional, Ehlmann, B. L., additional, Farmer, J. D., additional, Fernandez‐Remolar, D. C., additional, Filiberto, J., additional, Fogarty, J., additional, Glavin, D. P., additional, Goreva, Y. S., additional, Hallis, L. J., additional, Harrington, A. D., additional, Hausrath, E. M., additional, Herd, C. D. K., additional, Horgan, B., additional, Humayun, M., additional, Kleine, T., additional, Kleinhenz, J., additional, Mackelprang, R., additional, Mangold, N., additional, Mayhew, L. E., additional, McCoy, J. T., additional, McCubbin, F. M., additional, McLennan, S. M., additional, Moser, D. E., additional, Moynier, F., additional, Mustard, J. F., additional, Niles, P. B., additional, Ori, G. G., additional, Raulin, F., additional, Rettberg, P., additional, Rucker, M. A., additional, Schmitz, N., additional, Schwenzer, S. P., additional, Sephton, M. A., additional, Shaheen, R., additional, Sharp, Z. D., additional, Shuster, D. L., additional, Siljeström, S., additional, Smith, C. L., additional, Spry, J. A., additional, Steele, A., additional, Swindle, T. D., additional, ten Kate, I. L., additional, Tosca, N. J., additional, Usui, T., additional, Van Kranendonk, M. J., additional, Wadhwa, M., additional, Weiss, B. P., additional, Werner, S. C., additional, Westall, F., additional, Wheeler, R. M., additional, Zipfel, J., additional, and Zorzano, M. P., additional

Published
2019
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30. The potential science and engineering value of samples delivered to Earth by Mars sample return

Author

Beaty, David D.W., Grady, Monica, McSween, H. Y., Sefton-Nash, E., Carrier, B., Altieri, F., Ammannito, E., Amelin, Yuri, Anand, Mahesh, Benning, Liane G, Bishop, J. L., Borg, L. E., Boucher, D., Brucato, John Robert, Buseman, H., Campbell, K., Czaja, A. D., Debaille, Vinciane, Des Marais, D. J., Dixon, M., Ehlmann, B. L., Farmer, J. D., Fernandez-Remolar, D. C., Filiberto, J., Fogarty, J., Glavin, D. P., Goreva, Y. S., Hallis, L. J., Harrington, Andrea A. D., Hausrath, E. M., Herd, C. D. K., Horgan, B., Humayun, M., Kleine, Thorsten, Kleinhenz, J., Mangold, Nicolas, Mayhew, L. E., McCoy, Tim, McCubbin, Francis M., McLennan, Scott M., Moser, Desmond, Moynier, Frédéric, Mustard, John Fraser, Niles, P. B., Ori, G. G., Raulin, F., Rettberg, Petra, Rucker, M. A., Schmitz, Nicole, Schwenzer, Susanne P., Septhon, M. A., Shaheen, R., Sharp, Z. D., Shuster, D. L., Siljeström, S., Smith, Caroline L., Spry, J. A., Steele, Andrew, Swindle, T. D., Ten Kate, Inge Loes, Tosca, N. J., Usui, Tomohiro, Van Kranendonk, M. J., Wadhwa, Meenakshi, Weiss, Benjamin P., Werner, Stephanie C., Westall, Frances, Wheeler, R. M., Zipfel, Jutta, Zorzano, M. P., Beaty, David D.W., Grady, Monica, McSween, H. Y., Sefton-Nash, E., Carrier, B., Altieri, F., Ammannito, E., Amelin, Yuri, Anand, Mahesh, Benning, Liane G, Bishop, J. L., Borg, L. E., Boucher, D., Brucato, John Robert, Buseman, H., Campbell, K., Czaja, A. D., Debaille, Vinciane, Des Marais, D. J., Dixon, M., Ehlmann, B. L., Farmer, J. D., Fernandez-Remolar, D. C., Filiberto, J., Fogarty, J., Glavin, D. P., Goreva, Y. S., Hallis, L. J., Harrington, Andrea A. D., Hausrath, E. M., Herd, C. D. K., Horgan, B., Humayun, M., Kleine, Thorsten, Kleinhenz, J., Mangold, Nicolas, Mayhew, L. E., McCoy, Tim, McCubbin, Francis M., McLennan, Scott M., Moser, Desmond, Moynier, Frédéric, Mustard, John Fraser, Niles, P. B., Ori, G. G., Raulin, F., Rettberg, Petra, Rucker, M. A., Schmitz, Nicole, Schwenzer, Susanne P., Septhon, M. A., Shaheen, R., Sharp, Z. D., Shuster, D. L., Siljeström, S., Smith, Caroline L., Spry, J. A., Steele, Andrew, Swindle, T. D., Ten Kate, Inge Loes, Tosca, N. J., Usui, Tomohiro, Van Kranendonk, M. J., Wadhwa, Meenakshi, Weiss, Benjamin P., Werner, Stephanie C., Westall, Frances, Wheeler, R. M., Zipfel, Jutta, and Zorzano, M. P.

Abstract

Executive summary provided in lieu of abstract., SCOPUS: no.j, info:eu-repo/semantics/published

Published
2019

32. Prognostic value of the neutrophil-to-lymphocyte ratio in advanced hepatocellular carcinoma: An exploratory analysis from the ARQ197-215 study

Author

Personeni, N., primary, Giordano, L., additional, Abbadessa, G., additional, Porta, C., additional, Borbath, I., additional, Daniele, B., additional, Salvagni, S., additional, van Laethem, J.-L., additional, Van Vlierberghe, H., additional, Trojan, J., additional, Weiss, A., additional, Gasbarrini, A., additional, Shuster, D., additional, De Toni, E.N., additional, Lencioni, M., additional, Miles, S., additional, Lamar, M.E., additional, Schwartz, B., additional, Santoro, A., additional, and Rimassa, L., additional

Published
2016
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33. Prognostic significance of the neutrophil-to-lymphocyte ratio in patients with advanced hepatocellular carcinoma: the ARQ197-215 study

Author

Personeni, N., primary, Giordano, L., additional, Abbadessa, G., additional, Porta, C., additional, Borbath, I., additional, Daniele, B., additional, Salvagni, S., additional, Van Laethem, J.L., additional, Van Vlierberghe, H., additional, Trojan, J., additional, De Toni, E.N., additional, Weiss, A., additional, Miles, S., additional, Gasbarrini, A., additional, Lencioni, M., additional, Lamar, M.E., additional, Shuster, D., additional, Schwartz, B., additional, Santoro, A., additional, and Rimassa, L., additional

Published
2016
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35. A new Tektite Strewnfield in Atacama, Chile

Author

Devouard, Bertrand, Rochette, P., Gattacceca, J., Barrat, Jean-Alix, Moustard, F., Valenzuela, E. M., Alard, O., Balestrieri, M. L., Bigazzi, G., dos Santos, E., Gounelle, M., Jambon, A., Laridhi-Ouazza, N., Shuster, D. L., Warner, M., Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), Géosciences Montpellier, Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), and Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)

Subjects
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Abstract

77th Annual Meeting of the Meteoritical-Society, Casablanca, MOROCCO, SEP 08-13, 2014; International audience

Published
2014
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36. The bombardment history of the Moon as recorded by 40Ar-39Ar chronology

Author

Fernandes, V. A., Fritz, J., Weiss, B. P., Garrick-Bethell, I., and Shuster, D. L.

Abstract

New petrography and 40Ar‐39Ar ages have been obtained for 1–3 mm sized rock fragments from Apollo 16 Station 13 soil 63503 (North Ray crater ejecta) and chips from three rocks collected by Apollo 16 and Apollo 17 missions. Selection of these samples was aimed at the old 40Ar‐39Ar ages to understand the early history of the lunar magnetic field and impact flux. Fifteen samples were studied including crustal material, polymict feldspathic fragmental breccias, and impact melts. The impact ages obtained range between approximately 3.3 and 4.3 billion years (Ga). Polymict fragmental breccia 63503,1 exhibits the lowest signs of recrystallization observed and a probable old relic age of 4.547 ± 0.027. The plateau age of 4.293 ± 0.044 Ga obtained for impact melt rock 63503,13 represents the oldest known age for such a lithology. Possibly, this age represents the minimum age for the South Pole‐Aitken (SPA) Basin. In agreement with literature data, these results show that impact ages >3.9 Ga are found in lunar rocks, especially within soil 63503. Impact exhumation of deep‐seated warm crustal material onto the lunar surface is considered to explain the common 4.2 Ga ages obtained for weakly shocked samples from soil 63503 and Apollo 17. This would directly imply that one or more basin‐forming events occurred at that time. Some rock fragments showing none to limited petrologic features indicate thermal annealing. These rocks may have lost Ar while resident within the hot‐ejecta of a large basin. Concurrent with previous studies, these results lead us to advocate for a complex impact flux in the inner solar system during the initial approximately 1.3 Ga.

Published
2013
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38. Late Neogene exhumation and relief development of the Aar and Aiguilles Rouges massifs (Swiss Alps) from low-temperature thermochronology modeling and 4He/3He thermochronometry

Author

Valla, Pierre, Van Der Beek, Peter, L. Shuster, D., Braun, Jean, Herman, F., Tassan-Got, L., Gautheron, C., Tectonique reliefs et bassins, Institut des Sciences de la Terre (ISTerre), Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Interactions et dynamique des environnements de surface (IDES), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], [SDE.MCG]Environmental Sciences/Global Changes, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]
Abstract

INSU-CNRS 07-TOPO-EUROPE-FP-023 ANR-08-BLAN-0303-01 "Erosion and Relief Development in the Western Alps" (to P.A.v.d.B.), ANR-06-JCJC-0079 U.S. National Science Foundation grant EAR-0720225; The late Neogene-Quaternary exhumation history of the European Alps is the subject of controversial findings and interpretations, with several thermochronological studies arguing for long-term steady state exhumation rates, while others have pointed to late Miocene-Pliocene exhumation pulses associated with tectonic and/or climatic changes. Here, we perform inverse thermal-kinematic modeling on dense thermochronological data sets combining apatite fission track (AFT) data from the literature and recently published apatite (U-Th-Sm)/He (AHe) data along the upper Rhône valley (Aar and Aiguilles Rouges massifs, Swiss Alps) in order to derive precise estimates on the denudation and relief history of this region. We then apply forward numerical modeling to interpret cooling paths quantified from apatite 4He/3He thermochronometry, in terms of denudation and relief-development scenarios. Our modeling results highlight the respective benefits of using AFT/AHe thermochronology data and 4He/3He thermochronometry for extracting quantitative denudation and relief information. Modeling results suggest a late Miocene exhumation pulse lasting until ∼8-10 Ma, consistent with recently proposed exhumation histories for other parts of the European Alps, followed by moderate (∼0.3-0.5 km Myr−1) denudation rates during the late Miocene/Pliocene. Both inverse modeling and 4He/3He data reveal that the late stage exhumation of the studied massifs can be explained by a significant increase (∼85-100%) in local topographic relief through efficient glacial valley carving. Modeling results quantitatively constrain Rhône valley carving to 1-1.5 km since ∼1 Ma. We postulate that recent relief development within this part of the Swiss Alps is climatically driven by the onset of major Alpine glaciations at the mid-Pleistocene climate transition.

Published
2012
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39. Numerical investigations of apatite ^4He/^3He thermochronometry

Author

Farley, K. A., Shuster, D. L., Watson, E. B., Wanser, K. H., and Balco, G.

Abstract

Apatite ^4He/^3He thermochronometry has the potential to constrain cooling histories for individual samples provided that several presently untested assumptions are valid. Here we simulate the sensitivity of ^4He/^3He spectra to assumptions regarding geometric model, crystallographic anisotropy, broken grain terminations, parent nuclide zonation, and the accuracy of results obtained from analyses of aggregates of multiple crystals. We find that ^4He/^3He spectra obtained from a cylinder with isotropic diffusion are almost indistinguishable from those obtained from an equivalent sphere with an equivalent initial ^4He distribution. Under similar conditions anisotropic diffusion from the cylinder can greatly bias ^4He/^3He spectra, but only if diffusion is >10 times faster in the axial than the radial direction. Existing data argue against anisotropy of this magnitude. We find that analysis of apatites with broken terminations will also bias ^4He/^3He spectra, but not greatly so. In contrast, we find that zonation of a factor of 3 in parent nuclide concentration produces ^4He/^3He spectra that deviate substantially from the homogeneous model. When parent nuclides are highly concentrated near the grain rim and/or cooling is fast, the resulting ^4He/^3He spectra will be readily identified as aberrant. However, more subtle zonation, higher concentrations in the grain interior, or samples that have cooled slowly regardless of zonation style can yield ^4He/^3He spectra that look acceptable but will lead to inaccurate thermochronometric interpretation if parent homogeneity is assumed. Finally, we find that analysis of an aggregate of crystals with identical ^4He distributions can yield ^4He/^3He spectra (and diffusion Arrhenius arrays) that are very different from those that would be obtained on the individual crystals if even small variations in He diffusion exist among the grains. Overall, our observations suggest that modeling tools that assume spherical geometry and isotropic diffusion are appropriate for interpreting apatite ^4He/^3He spectra. However, it is essential to analyze only individual crystals and to assess the degree of parent nuclide zonation in those crystals.

Published
2010

44. Phase II study of the halichondrin B analog eribulin mesylate in patients with locally advanced or metastatic breast cancer previously treated with an anthracycline, a taxane, and capecitabine.

Author

Cortes, Javier, Vahdat, L., Blum, J., Twelves, Chris J, Campone, M., Roche, Henri, Bachelot, Thomas, Awada, Ahmad, Paridaens, R., Goncalves, A., Shuster, D., Wanders, Jantien, Fang, F., Gurnani, R., Richmond, E., Cole, Patricia E, Ashworth, Simon, Allison, M., Cortes, Javier, Vahdat, L., Blum, J., Twelves, Chris J, Campone, M., Roche, Henri, Bachelot, Thomas, Awada, Ahmad, Paridaens, R., Goncalves, A., Shuster, D., Wanders, Jantien, Fang, F., Gurnani, R., Richmond, E., Cole, Patricia E, Ashworth, Simon, and Allison, M.

Abstract

The activity and safety of eribulin mesylate (E7389), a nontaxane microtubule dynamics inhibitor with a novel mechanism of action, were evaluated in patients with locally advanced or metastatic breast cancer previously treated with an anthracycline, taxane, and capecitabine., Clinical Trial, Phase II, Journal Article, Multicenter Study, Research Support, Non-U.S. Gov't, info:eu-repo/semantics/published

Published
2010

45. Efficacy Analysis for Molecular Subgroups in MARQUEE: a Randomized, Double-blind, Placebo-controlled, Phase 3 Trial of Tivantinib (ARQ 197) Plus Erlotinib versus Placebo plus Erlotinib in Previously Treated Patients with Locally Advanced or Metastatic, Non-squamous, Non-small Cell Lung Cancer (NSCLC)

Author

Pawel, J von, primary, Scagliotti, G, additional, Novello, S, additional, Ramlau, R, additional, Favaretto, A, additional, Barlesi, F, additional, Akerley, W, additional, Orlov, S, additional, Santoro, A, additional, Shepherd, F, additional, Spigel, D, additional, Hirsh, V, additional, Sequist, L, additional, Shuster, D, additional, Zahir, H, additional, Wang, Q, additional, Schwartz, B, additional, Roemeling, R von, additional, and Sandler, AB, additional

Published
2014
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46. Clinical efficacy of electrical stimulation exercise training:Effects on health, fitness, and function

Author

Janssen, T. W J, Glaser, R. M., and Shuster, D. B.

Subjects
Musculoskeletal system, SDG 3 - Good Health and Well-being, Spinal cord injury, Lower limb paralysis, Resistance training
Abstract

The purpose of this article is to summarize research findings pertaining to the effects of functional electrical stimulation (FES) lower limb exercise training on health, fitness, and function in individuals with spinal cord injury. This lays the foundation for defining the potential clinical efficacy of FES exercise for reducing the risk of secondary medical complications. This article also reviews the effects of FES exercise on the muscular, skeletal, integumentary, immune, and cardiopulmonary systems, as well as on functional performance.

Published
1998

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