GSTDTAP  > 地球科学
DOI10.1038/s41561-019-0458-8
An interval of high salinity in ancient Gale crater lake on Mars
Rapin, W.1; Ehlmann, B. L.1,2; Dromart, G.3; Schieber, J.4; Thomas, N. H.1; Fischer, W. W.1; Fox, V. K.1; Stein, N. T.1; Nachon, M.5; Clark, B. C.6; Kah, L. C.7; Thompson, L.8; Meyer, H. A.1; Gabriel, T. S. J.9; Hardgrove, C.9; Mangold, N.10; Rivera-Hernandez, F.11; Wiens, R. C.12; Vasavada, A. R.2
2019-11-01
发表期刊NATURE GEOSCIENCE
ISSN1752-0894
EISSN1752-0908
出版年2019
卷号12期号:11页码:889-+
文章类型Article
语种英语
国家USA; France; Canada
英文摘要

Precipitated minerals, including salts, are primary tracers of atmospheric conditions and water chemistry in lake basins. Ongoing in situ exploration by the Curiosity rover of Hesperian (around 3.3-3.7 Gyr old) sedimentary rocks within Gale crater on Mars has revealed clay-bearing fluvio-lacustrine deposits with sporadic occurrences of sulfate minerals, primarily as late-stage diagenetic veins and concretions. Here we report bulk enrichments, disseminated in the bedrock, of 30-50 wt% calcium sulfate intermittently over about 150 m of stratigraphy, and of 26-36 wt% hydrated magnesium sulfate within a thinner section of strata. We use geochemical analysis, primarily from the ChemCam laser-induced breakdown spectrometer, combined with results from other rover instruments, to characterize the enrichments and their lithology. The deposits are consistent with early diagenetic, pre-compaction salt precipitation from brines concentrated by evaporation, including magnesium sulfate-rich brines from extreme evaporative concentration. This saline interval represents a substantial hydrological perturbation of the lake basin, which may reflect variations in Mars' obliquity and orbital parameters. Our findings support stepwise changes in Martian climate during the Hesperian, leading to more arid and sulfate-dominated environments as previously inferred from orbital observations.


领域地球科学 ; 气候变化
收录类别SCI-E
WOS记录号WOS:000493905700008
WOS关键词INDUCED BREAKDOWN SPECTROSCOPY ; CHEMCAM INSTRUMENT SUITE ; MAGNESIUM-SULFATE ; CALCIUM-SULFATE ; PAHRUMP HILLS ; IDENTIFICATION ; CHEMISTRY ; ROCKS ; PRECIPITATION ; STRATIGRAPHY
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/223758
专题地球科学
气候变化
作者单位1.CALTECH, Pasadena, CA 91125 USA;
2.CALTECH, Jet Prop Lab, Pasadena, CA USA;
3.Univ Lyon, Lab Geol Lyon, Lyon, France;
4.Indiana Univ, Bloomington, IN USA;
5.Texas A&M Univ, College Stn, TX USA;
6.Space Sci Inst, Boulder, CO USA;
7.Univ Tennessee, Knoxville, TN USA;
8.Univ New Brunswick, Fredericton, NB, Canada;
9.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA;
10.Univ Angers, Univ Nantes, CNRS, Lab Planetol & Geodynam,UMR6112, Nantes, France;
11.Dartmouth Coll, Hanover, NH 03755 USA;
12.Los Alamos Natl Lab, Los Alamos, NM USA
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Rapin, W.,Ehlmann, B. L.,Dromart, G.,et al. An interval of high salinity in ancient Gale crater lake on Mars[J]. NATURE GEOSCIENCE,2019,12(11):889-+.
APA Rapin, W..,Ehlmann, B. L..,Dromart, G..,Schieber, J..,Thomas, N. H..,...&Vasavada, A. R..(2019).An interval of high salinity in ancient Gale crater lake on Mars.NATURE GEOSCIENCE,12(11),889-+.
MLA Rapin, W.,et al."An interval of high salinity in ancient Gale crater lake on Mars".NATURE GEOSCIENCE 12.11(2019):889-+.
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