气候变化领域集成服务门户(CCPortal): An interval of high salinity in ancient Gale crater lake on Mars

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DOI	10.1038/s41561-019-0458-8
	An interval of high salinity in ancient Gale crater lake on Mars
	Rapin W.; Ehlmann B.L.; Dromart G.; Schieber J.; Thomas N.H.; Fischer W.W.; Fox V.K.; Stein N.T.; Nachon M.; Clark B.C.; Kah L.C.; Thompson L.; Meyer H.A.; Gabriel T.S.J.; Hardgrove C.; Mangold N.; Rivera-Hernandez F.; Wiens R.C.; Vasavada A.R.
发表日期	2019
ISSN	17520894
卷号	12 期号:11
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. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	crater lake; diagenesis; in situ measurement; Mars; obliquity; perturbation; salinity; sulfate; unmanned vehicle; vein (geology); water chemistry; Hesperia
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124581
作者单位	California Institute of Technology, Pasadena, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Laboratoire de Géologie de Lyon, Université de Lyon, Lyon, France; Indiana University, Bloomington, IN, United States; Texas A&M University, College Station, TX, United States; Space Science Institute, Boulder, CO, United States; University of Tennessee, Knoxville, TN, United States; University of New Brunswick, Fredericton, Canada; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States; Laboratoire de Planétologie et Géodynamique, UMR6112, CNRS, Université Nantes, Université Angers, Nantes, France; Dartmouth College, Hanover, NH, United States; Los Alamos National Laboratory, Los Alamos, NM, United States
推荐引用方式 GB/T 7714	Rapin W.,Ehlmann B.L.,Dromart G.,et al. An interval of high salinity in ancient Gale crater lake on Mars[J],2019,12(11).
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).
MLA	Rapin W.,et al."An interval of high salinity in ancient Gale crater lake on Mars".Nature Geoscience 12.11(2019).