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14 results on '"Perrett, G. M"'

1. Elemental Geochemistry of Sedimentary Rocks at Yellowknife Bay, Gale Crater, Mars

Author

MSL Science Team, McLennan, S. M., Anderson, R. B., Bell, J. F., Bridges, J. C., Calef, F., Campbell, J. L., Clark, B. C., Clegg, S., Conrad, P., Cousin, A., Des Marais, D. J., Dromart, G., Dyar, M. D., Edgar, L. A., Ehlmann, B. L., Fabre, C., Forni, O., Gasnault, O., Gellert, R., Gordon, S., Grant, J. A., Grotzinger, J. P., Gupta, S., Herkenhoff, K. E., Hurowitz, J. A., King, P. L., Le Mouélic, S., Leshin, L. A., Léveillé, R., Lewis, K. W., Mangold, N., Maurice, S., Ming, D. W., Morris, R. V., Nachon, M., Newsom, H. E., Ollila, A. M., Perrett, G. M., Rice, M. S., Schmidt, M. E., Schwenzer, S. P., Stack, K., Stolper, E. M., Sumner, D. Y., Treiman, A. H., VanBommel, S., Vaniman, D. T., Vasavada, A., Wiens, R. C., and Yingst, R. A.

Published
2014

2. Volatile and Organic Compositions of Sedimentary Rocks in Yellowknife Bay, Gale Crater, Mars

Author

MSL Science Team, Ming, D. W., Archer, P. D., Glavin, D. P., Eigenbrode, J. L., Franz, H. B., Sutter, B., Brunner, A. E., Stern, J. C., Freissinet, C., McAdam, A. C., Mahaffy, P. R., Cabane, M., Coll, P., Campbell, J. L., Atreya, S. K., Niles, P. B., Bell, J. F., Bish, D. L., Brinckerhoff, W. B., Buch, A., Conrad, P. G., Des Marais, D. J., Ehlmann, B. L., Fairén, A. G., Farley, K., Flesch, G. J., Francois, P., Gellert, R., Grant, J. A., Grotzinger, J. P., Gupta, S., Herkenhoff, K. E., Hurowitz, J. A., Leshin, L. A., Lewis, K. W., McLennan, S. M., Miller, K. E., Moersch, J., Morris, R. V., Navarro-González, R., Pavlov, A. A., Perrett, G. M., Pradler, I., Squyres, S. W., Summons, R. E., Steele, A., Stolper, E. M., Sumner, D. Y., Szopa, C., Teinturier, S., Trainer, M. G., Treiman, A. H., Vaniman, D. T., Vasavada, A. R., Webster, C. R., Wray, J. J., and Yingst, R. A.

Published
2014

3. Germanium Enrichments in Sedimentary Rocks in Gale Crater, Mars: Constraining the Timing of Alteration and Character of the Protolith

Author

Berger, J. A, Schmidt, M. E, Gellert, R, Campbell, J. L, Boyd, N. I, Elliott, B. E, Fisk, M. R, King, P. L, Ming, D. W, Perrett, G. M, Thompson, L. M, VanBommel, S. J, and Yen, A

Subjects
Geophysics
Abstract

Rocks enriched in Ge have been discovered in Gale Crater, Mars, by the Alpha-particle X-ray spectrometer (APXS) on the Mars Science Lab (MSL) rover, Curiosity. The Ge concentrations in Gale Crater (commonly >50 ppm) are remarkably high in comparison to Earth, where Ge ranges from 0.5-4.0 ppm in igneous rocks and 0.2-3.3 ppm in siliciclastic sediment. Primary meteoritic input is not likely the source of high Ge because Ge/Ni in chondrites (approx.0.003) and irons (<0.04) is lower than in Gale rocks (0.08-0.2). Earth studies show Ge is a useful geochemical tracer because it is coherent with Si during magmatic processes and Ge/Si varies less than 20% in basalts. Ge and Si fractionate during soil/regolith weathering, with Ge preferentially sequestered in clays. Ge is also concentrated in Cu- and Zn-rich hydrothermal sulfide deposits and Fe- and Mnrich oxide deposits. Other fluid-mobile elements (K, Zn, Cl, Br, S) are also enriched at Gale and further constrain aqueous alteration processes. Here, we interpret the sediment alteration history and present a possible model for Ge enrichments at Gale involving fluid alteration of the protolith.

Published
2015

4. Volatile and Organic Compositions of Sedimentary Rocks in Yellowknife Bay, Gale Crater, Mars

Author

Ming, D. W., Archer, P. D., Jr., Glavin, D. P., Eigenbrode, J. L., Franz, H. B., Sutter, B., Brunner, A. E., Stern, J. C., Freissinet, C., McAdam, A. C., Mahaffy, P. R., Cabane, M., Coll, P., Campbell, J. L., Atreya, S. K., Niles, P. B., Bell, J. F., III, Bish, D. L., Brinckerhoff, W. B., Buch, A., Conrad, P. G., Des Marais, D. J., Ehlmann, B. L., Fairén, A. G., Farley, K., Flesch, G. J., Francois, P., Gellert, R., Grant, J. A., Grotzinger, J. P., Gupta, S., Herkenhoff, K. E., Hurowitz, J. A., Leshin, L. A., Lewis, K. W., McLennan, S. M., Miller, K. E., Moersch, J., Morris, R. V., Navarro-González, R., Pavlov, A. A., Perrett, G. M., Pradler, I., Squyres, S. W., Summons, R. E., Steele, A., Stolper, E. M., Sumner, D. Y., Szopa, C., Teinturier, S., Trainer, M. G., Treiman, A. H., Vaniman, D. T., Vasavada, A. R., Webster, C. R., Wray, J. J., and Yingst, R. A.

Published
2014

5. Elemental Geochemistry of Sedimentary Rocks at Yellowknife Bay, Gale Crater, Mars

Author

McLennan, S. M., Anderson, R. B., Bell, J. F., III, Bridges, J. C., Calef, F., III, Campbell, J. L., Clark, B. C., Clegg, S., Conrad, P., Cousin, A., Des Marais, D. J., Dromart, G., Dyar, M. D., Edgar, L. A., Ehlmann, B. L., Fabre, C., Forni, O., Gasnault, O., Gellert, R., Gordon, S., Grant, J. A., Grotzinger, J. P., Gupta, S., Herkenhoff, K. E., Hurowitz, J. A., King, P. L., Le Mouélic, S., Leshin, L. A., Léveillé, R., Lewis, K. W., Mangold, N., Maurice, S., Ming, D. W., Morris, R. V., Nachon, M., Newsom, H. E., Ollila, A. M., Perrett, G. M., Rice, M. S., Schmidt, M. E., Schwenzer, S. P., Stack, K., Stolper, E. M., Sumner, D. Y., Treiman, A. H., VanBommel, S., Vaniman, D. T., Vasavada, A., Wiens, R. C., and Yingst, R. A.

Published
2014

8. Geochemical diversity and K-rich compositions found by the MSL APXS in Gale Crater, Mars

Author

Schmidt, M. E., King, P. L., Gellert, R., Elliott, B., Thompson, L., Berger, J. A., Bridges, J., Campbell, L., Ehlmann, B., Grotzinger, J., Hurowitz, J., Leshin, L., Lewis, K. W., McLennan, S. M., Ming, D. W., Perrett, G. M., Pradler, I., Stolper, E. M., Squyres, S. W., and Trieman, A. H.

Abstract

Along the Curiosity rover’s traverse toward Glenelg (through sol 102) the Alpha Particle X-ray Spectrometer (APXS) analysed four rocks and one soil. Microscopic images and compositions of unbrushed rock surfaces are consistent with 5-20% dust contamination. Nevertheless, the underlying characteristics of these rocks may still be discerned. As a group, they span nearly the entire range in FeO^* and MnO of the Martian dataset. In addition, they are particularly enriched in volatile metals (K, Zn, Ge), and these elements do not correlate with Cl or S. One rock, Jake_Matijevic is notably alkaline and evolved; its composition is that of a nepheline normative mugearite. The other three rocks plot in the basanite field of a TAS diagram, with high K_2O (up to 3.0%) and low SiO_2. These three rocks are otherwise SNC-like (high Fe and low Al). Three out of the four rocks (including Jake_Matijevic) plot along a line in variation diagrams, suggesting mixing of Fe-rich and Al-rich components, likely by sedimentary processes. With only four rocks analyzed so far and ambiguity as to their geologic context (e.g. outcrop vs. float; igneous vs. sedimentary) additional measurements are needed to fully understand the region. It is nevertheless clear that Curiosity landed in a lithologically diverse, K-rich region of Mars.

Published
2013

9. Geochemical diversity in first rocks examined by the Curiosity Rover in Gale Crater: Evidence for and significance of an alkali and volatile-rich igneous source

Author

Schmidt, M. E., primary, Campbell, J. L., additional, Gellert, R., additional, Perrett, G. M., additional, Treiman, A. H., additional, Blaney, D. L., additional, Olilla, A., additional, Calef, F. J., additional, Edgar, L., additional, Elliott, B. E., additional, Grotzinger, J., additional, Hurowitz, J., additional, King, P. L., additional, Minitti, M. E., additional, Sautter, V., additional, Stack, K., additional, Berger, J. A., additional, Bridges, J. C., additional, Ehlmann, B. L., additional, Forni, O., additional, Leshin, L. A., additional, Lewis, K. W., additional, McLennan, S. M., additional, Ming, D. W., additional, Newsom, H., additional, Pradler, I., additional, Squyres, S. W., additional, Stolper, E. M., additional, Thompson, L., additional, VanBommel, S., additional, and Wiens, R. C., additional

Published
2014
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11. APXS Gale soil and Bagnold sand compositions.

Author

O'Connell-Cooper, C. D., Thompson, L. M., Spray, J. G., Gellert, R., Berger, J. A., Boyd, N. I., Desouza, E. D., Perrett, G. M., Schmidt, M., and VanBommel, S. J.

Subjects
SOIL composition, SAND, GALE Crater (Mars)
Published
2017

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