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4 results on '"Grant JA"'

1. Deposition, exhumation, and paleoclimate of an ancient lake deposit, Gale crater, Mars.

Author

Grotzinger, JP, Grotzinger, JP, Gupta, S, Malin, MC, Rubin, DM, Schieber, J, Siebach, K, Sumner, DY, Stack, KM, Vasavada, AR, Arvidson, RE, Calef, F, Edgar, L, Fischer, WF, Grant, JA, Griffes, J, Kah, LC, Lamb, MP, Lewis, KW, Mangold, N, Minitti, ME, Palucis, M, Rice, M, Williams, RME, Yingst, RA, Blake, D, Blaney, D, Conrad, P, Crisp, J, Dietrich, WE, Dromart, G, Edgett, KS, Ewing, RC, Gellert, R, Hurowitz, JA, Kocurek, G, Mahaffy, P, McBride, MJ, McLennan, SM, Mischna, M, Ming, D, Milliken, R, Newsom, H, Oehler, D, Parker, TJ, Vaniman, D, Wiens, RC, Wilson, SA, Grotzinger, JP, Grotzinger, JP, Gupta, S, Malin, MC, Rubin, DM, Schieber, J, Siebach, K, Sumner, DY, Stack, KM, Vasavada, AR, Arvidson, RE, Calef, F, Edgar, L, Fischer, WF, Grant, JA, Griffes, J, Kah, LC, Lamb, MP, Lewis, KW, Mangold, N, Minitti, ME, Palucis, M, Rice, M, Williams, RME, Yingst, RA, Blake, D, Blaney, D, Conrad, P, Crisp, J, Dietrich, WE, Dromart, G, Edgett, KS, Ewing, RC, Gellert, R, Hurowitz, JA, Kocurek, G, Mahaffy, P, McBride, MJ, McLennan, SM, Mischna, M, Ming, D, Milliken, R, Newsom, H, Oehler, D, Parker, TJ, Vaniman, D, Wiens, RC, and Wilson, SA

Abstract

The landforms of northern Gale crater on Mars expose thick sequences of sedimentary rocks. Based on images obtained by the Curiosity rover, we interpret these outcrops as evidence for past fluvial, deltaic, and lacustrine environments. Degradation of the crater wall and rim probably supplied these sediments, which advanced inward from the wall, infilling both the crater and an internal lake basin to a thickness of at least 75 meters. This intracrater lake system probably existed intermittently for thousands to millions of years, implying a relatively wet climate that supplied moisture to the crater rim and transported sediment via streams into the lake basin. The deposits in Gale crater were then exhumed, probably by wind-driven erosion, creating Aeolis Mons (Mount Sharp).

Published
2015

2. Deposition, exhumation, and paleoclimate of an ancient lake deposit, Gale crater, Mars.

Author

Grotzinger, JP, Grotzinger, JP, Gupta, S, Malin, MC, Rubin, DM, Schieber, J, Siebach, K, Sumner, DY, Stack, KM, Vasavada, AR, Arvidson, RE, Calef, F, Edgar, L, Fischer, WF, Grant, JA, Griffes, J, Kah, LC, Lamb, MP, Lewis, KW, Mangold, N, Minitti, ME, Palucis, M, Rice, M, Williams, RME, Yingst, RA, Blake, D, Blaney, D, Conrad, P, Crisp, J, Dietrich, WE, Dromart, G, Edgett, KS, Ewing, RC, Gellert, R, Hurowitz, JA, Kocurek, G, Mahaffy, P, McBride, MJ, McLennan, SM, Mischna, M, Ming, D, Milliken, R, Newsom, H, Oehler, D, Parker, TJ, Vaniman, D, Wiens, RC, Wilson, SA, Grotzinger, JP, Grotzinger, JP, Gupta, S, Malin, MC, Rubin, DM, Schieber, J, Siebach, K, Sumner, DY, Stack, KM, Vasavada, AR, Arvidson, RE, Calef, F, Edgar, L, Fischer, WF, Grant, JA, Griffes, J, Kah, LC, Lamb, MP, Lewis, KW, Mangold, N, Minitti, ME, Palucis, M, Rice, M, Williams, RME, Yingst, RA, Blake, D, Blaney, D, Conrad, P, Crisp, J, Dietrich, WE, Dromart, G, Edgett, KS, Ewing, RC, Gellert, R, Hurowitz, JA, Kocurek, G, Mahaffy, P, McBride, MJ, McLennan, SM, Mischna, M, Ming, D, Milliken, R, Newsom, H, Oehler, D, Parker, TJ, Vaniman, D, Wiens, RC, and Wilson, SA

Abstract

The landforms of northern Gale crater on Mars expose thick sequences of sedimentary rocks. Based on images obtained by the Curiosity rover, we interpret these outcrops as evidence for past fluvial, deltaic, and lacustrine environments. Degradation of the crater wall and rim probably supplied these sediments, which advanced inward from the wall, infilling both the crater and an internal lake basin to a thickness of at least 75 meters. This intracrater lake system probably existed intermittently for thousands to millions of years, implying a relatively wet climate that supplied moisture to the crater rim and transported sediment via streams into the lake basin. The deposits in Gale crater were then exhumed, probably by wind-driven erosion, creating Aeolis Mons (Mount Sharp).

Published
2015

3. A habitable fluvio-lacustrine environment at Yellowknife Bay, Gale crater, Mars.

Author

Grotzinger, JP, Grotzinger, JP, Sumner, DY, Kah, LC, Stack, K, Gupta, S, Edgar, L, Rubin, D, Lewis, K, Schieber, J, Mangold, N, Milliken, R, Conrad, PG, DesMarais, D, Farmer, J, Siebach, K, Calef, F, Hurowitz, J, McLennan, SM, Ming, D, Vaniman, D, Crisp, J, Vasavada, A, Edgett, KS, Malin, M, Blake, D, Gellert, R, Mahaffy, P, Wiens, RC, Maurice, S, Grant, JA, Wilson, S, Anderson, RC, Beegle, L, Arvidson, R, Hallet, B, Sletten, RS, Rice, M, Bell, J, Griffes, J, Ehlmann, B, Anderson, RB, Bristow, TF, Dietrich, WE, Dromart, G, Eigenbrode, J, Fraeman, A, Hardgrove, C, Herkenhoff, K, Jandura, L, Kocurek, G, Lee, S, Leshin, LA, Leveille, R, Limonadi, D, Maki, J, McCloskey, S, Meyer, M, Minitti, M, Newsom, H, Oehler, D, Okon, A, Palucis, M, Parker, T, Rowland, S, Schmidt, M, Squyres, S, Steele, A, Stolper, E, Summons, R, Treiman, A, Williams, R, Yingst, A, MSL Science Team, Grotzinger, JP, Grotzinger, JP, Sumner, DY, Kah, LC, Stack, K, Gupta, S, Edgar, L, Rubin, D, Lewis, K, Schieber, J, Mangold, N, Milliken, R, Conrad, PG, DesMarais, D, Farmer, J, Siebach, K, Calef, F, Hurowitz, J, McLennan, SM, Ming, D, Vaniman, D, Crisp, J, Vasavada, A, Edgett, KS, Malin, M, Blake, D, Gellert, R, Mahaffy, P, Wiens, RC, Maurice, S, Grant, JA, Wilson, S, Anderson, RC, Beegle, L, Arvidson, R, Hallet, B, Sletten, RS, Rice, M, Bell, J, Griffes, J, Ehlmann, B, Anderson, RB, Bristow, TF, Dietrich, WE, Dromart, G, Eigenbrode, J, Fraeman, A, Hardgrove, C, Herkenhoff, K, Jandura, L, Kocurek, G, Lee, S, Leshin, LA, Leveille, R, Limonadi, D, Maki, J, McCloskey, S, Meyer, M, Minitti, M, Newsom, H, Oehler, D, Okon, A, Palucis, M, Parker, T, Rowland, S, Schmidt, M, Squyres, S, Steele, A, Stolper, E, Summons, R, Treiman, A, Williams, R, Yingst, A, and MSL Science Team

Abstract

The Curiosity rover discovered fine-grained sedimentary rocks, which are inferred to represent an ancient lake and preserve evidence of an environment that would have been suited to support a martian biosphere founded on chemolithoautotrophy. This aqueous environment was characterized by neutral pH, low salinity, and variable redox states of both iron and sulfur species. Carbon, hydrogen, oxygen, sulfur, nitrogen, and phosphorus were measured directly as key biogenic elements; by inference, phosphorus is assumed to have been available. The environment probably had a minimum duration of hundreds to tens of thousands of years. These results highlight the biological viability of fluvial-lacustrine environments in the post-Noachian history of Mars.

Published
2014

4. A habitable fluvio-lacustrine environment at Yellowknife Bay, Gale crater, Mars.

Author

Grotzinger, JP, Grotzinger, JP, Sumner, DY, Kah, LC, Stack, K, Gupta, S, Edgar, L, Rubin, D, Lewis, K, Schieber, J, Mangold, N, Milliken, R, Conrad, PG, DesMarais, D, Farmer, J, Siebach, K, Calef, F, Hurowitz, J, McLennan, SM, Ming, D, Vaniman, D, Crisp, J, Vasavada, A, Edgett, KS, Malin, M, Blake, D, Gellert, R, Mahaffy, P, Wiens, RC, Maurice, S, Grant, JA, Wilson, S, Anderson, RC, Beegle, L, Arvidson, R, Hallet, B, Sletten, RS, Rice, M, Bell, J, Griffes, J, Ehlmann, B, Anderson, RB, Bristow, TF, Dietrich, WE, Dromart, G, Eigenbrode, J, Fraeman, A, Hardgrove, C, Herkenhoff, K, Jandura, L, Kocurek, G, Lee, S, Leshin, LA, Leveille, R, Limonadi, D, Maki, J, McCloskey, S, Meyer, M, Minitti, M, Newsom, H, Oehler, D, Okon, A, Palucis, M, Parker, T, Rowland, S, Schmidt, M, Squyres, S, Steele, A, Stolper, E, Summons, R, Treiman, A, Williams, R, Yingst, A, MSL Science Team, Grotzinger, JP, Grotzinger, JP, Sumner, DY, Kah, LC, Stack, K, Gupta, S, Edgar, L, Rubin, D, Lewis, K, Schieber, J, Mangold, N, Milliken, R, Conrad, PG, DesMarais, D, Farmer, J, Siebach, K, Calef, F, Hurowitz, J, McLennan, SM, Ming, D, Vaniman, D, Crisp, J, Vasavada, A, Edgett, KS, Malin, M, Blake, D, Gellert, R, Mahaffy, P, Wiens, RC, Maurice, S, Grant, JA, Wilson, S, Anderson, RC, Beegle, L, Arvidson, R, Hallet, B, Sletten, RS, Rice, M, Bell, J, Griffes, J, Ehlmann, B, Anderson, RB, Bristow, TF, Dietrich, WE, Dromart, G, Eigenbrode, J, Fraeman, A, Hardgrove, C, Herkenhoff, K, Jandura, L, Kocurek, G, Lee, S, Leshin, LA, Leveille, R, Limonadi, D, Maki, J, McCloskey, S, Meyer, M, Minitti, M, Newsom, H, Oehler, D, Okon, A, Palucis, M, Parker, T, Rowland, S, Schmidt, M, Squyres, S, Steele, A, Stolper, E, Summons, R, Treiman, A, Williams, R, Yingst, A, and MSL Science Team

Abstract

The Curiosity rover discovered fine-grained sedimentary rocks, which are inferred to represent an ancient lake and preserve evidence of an environment that would have been suited to support a martian biosphere founded on chemolithoautotrophy. This aqueous environment was characterized by neutral pH, low salinity, and variable redox states of both iron and sulfur species. Carbon, hydrogen, oxygen, sulfur, nitrogen, and phosphorus were measured directly as key biogenic elements; by inference, phosphorus is assumed to have been available. The environment probably had a minimum duration of hundreds to tens of thousands of years. These results highlight the biological viability of fluvial-lacustrine environments in the post-Noachian history of Mars.

Published
2014

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