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Martian Fluvial Conglomerates at Gale Crater

by Gupta, S. , Sumner, D. Y. , Madsen, M. B. , Palucis, M. C. , Newsom, H. E. , Pariser, O. , Dietrich, W. E. , Schwenzer, S. P. , Deen, R. G. , Bell, J. F. , Yingst, R. A. , Farmer, J. D. , Wiens, R. C. , Koefoed, A. , Williams, R. M. E. , Gasnault, O. , Ollila, A. , Anderson, R. B. , Maurice, S. , Rubin, D. , Edgett, K. S. , Forni, O. , Stack, K. M. , Blaney, D. L. , Bridges, J. C. , Jensen, J. K. , Dromart, G. , Herkenhoff, K. E. , Grotzinger, J. P. , Lewis, K. W. , Sullivan, R. , Van Beek, T. , Le Mouélic, S. , Mangold, N. , Malin, M. C. , Kah, L. C. , Goetz, W.

in Abrasion / Abrasion resistance / Alluvial fans / Average velocity / Climatic conditions / Conglomerates / Craters / Earth Sciences / Energetic particles / Fluvial transport / Impact craters / Mars / Outcrops / Pebbles / Planetary science / Rock / Rocks / Sand / Science Laboratories / Sciences of the Universe / Sediment transport / Sediments / Spacecraft / Water depth / Water flow

2013

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Martian Fluvial Conglomerates at Gale Crater

2013

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Martian Fluvial Conglomerates at Gale Crater

2013

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Journal Article

Martian Fluvial Conglomerates at Gale Crater

Gupta, S.,

Sumner, D. Y.,

Madsen, M. B.,

Palucis, M. C.,

Newsom, H. E.,

Pariser, O.,

Dietrich, W. E.,

Schwenzer, S. P.,

Deen, R. G.,

Bell, J. F.,

Yingst, R. A.,

Farmer, J. D.,

Wiens, R. C.,

Koefoed, A.,

Williams, R. M. E.,

Gasnault, O.,

Ollila, A.,

Anderson, R. B.,

Maurice, S.,

Rubin, D.,

Edgett, K. S.,

Forni, O.,

Stack, K. M.,

Blaney, D. L.,

Bridges, J. C.,

Jensen, J. K.,

Dromart, G.,

Herkenhoff, K. E.,

Grotzinger, J. P.,

Lewis, K. W.,

Sullivan, R.,

Van Beek, T.,

Le Mouélic, S.,

Mangold, N.,

Malin, M. C.,

Kah, L. C.,

Goetz, W.

2013

Overview

Observations by the Mars Science Laboratory Mast Camera (Mastcam) in Gale crater reveal isolated outcrops of cemented pebbles (2 to 40 millimeters in diameter) and sand grains with textures typical of fluvial sedimentary conglomerates. Rounded pebbles in the conglomerates indicate substantial fluvial abrasion. ChemCam emission spectra at one outcrop show a predominantly feldspathic composition, consistent with minimal aqueous alteration of sediments. Sediment was mobilized in ancient water flows that likely exceeded the threshold conditions (depth 0.03 to 0.9 meter, average velocity 0.20 to 0.75 meter per second) required to transport the pebbles. Climate conditions at the time sediment was transported must have differed substantially from the cold, hyper-arid modern environment to permit aqueous flows across several kilometers.

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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science,American Association for the Advancement of Science (AAAS)

Subject

Abrasion

/ Abrasion resistance

/ Alluvial fans

/ Average velocity

/ Climatic conditions

/ Conglomerates

/ Craters

/ Earth Sciences

/ Energetic particles

/ Fluvial transport

/ Impact craters