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Title: Martian Fluvial Conglomerates at Gale Crater
Authors: Williams, R.M.E.
Grotzinger, J.P.
Dietrich, W.E.
Gupta, S.
Sumner, D.Y.
Wiens, R.C.
Mangold, N.
Malin, M.C.
Edgett, K.S.
Maurice, S.
Forni, O.
Gasnault, O.
Ollila, A.
Newsom, H.E.
Dromart, G.
Palucis, M.C.
Yingst, R.A.
Anderson, R.B.
Herkenhoff, K.E.
Le Mouelic, S.
Goetz, W.
Madsen, M.B.
Koefoed, A.
Jensen, J.K.
Bridges, JC
Schwenzer, S.P.
Lewis, K.W.
Stack, K.M.
Rubin, D.
Kah, L.C.
Bell, J.F.
Farmer, J.D.
Sullivan, R.
Van Beek, T.
Blaney, D.L.
Pariser, O.
Deen, R.G.
First Published: 31-May-2013
Publisher: American Association for the Advancement of Science
Citation: Science, 2013, 340 (6136), pp. 1068-1072
Abstract: 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.
DOI Link: 10.1126/science.1237317
ISSN: 0036-8075
eISSN: 1095-9203
Type: Journal Article
Description: Full text of this item is not currently available on the LRA. The final published version may be available through the links above.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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