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Title: An interval of high salinity in ancient Gale crater lake on Mars

Abstract

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. In this work, 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.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [1];  [1];  [1];  [1];  [5];  [6]; ORCiD logo [7];  [8];  [1];  [9];  [9];  [10]; ORCiD logo [11]; ORCiD logo [12];  [2]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States)
  2. California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
  3. Univ. of Lyon (France)
  4. Indiana Univ., Bloomington, IN (United States)
  5. Texas A & M Univ., College Station, TX (United States)
  6. Space Science Inst., Boulder, CO (United States)
  7. Univ. of Tennessee, Knoxville, TN (United States)
  8. Univ. of New Brunswick, Fredericton NB (Canada)
  9. Arizona State Univ., Tempe, AZ (United States)
  10. Univ. Nantes (France); Univ. Angers (France)
  11. Dartmouth College, Hanover, NH (United States)
  12. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1734724
Report Number(s):
LA-UR-19-32327
Journal ID: 1752-0894 ; 1752-0908 (Electronic)
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Nature Geoscience
Additional Journal Information:
Journal Volume: 12; Journal Issue: 11
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Planetary Sciences

Citation Formats

Rapin, William, Ehlmann, Bethany L., Dromart, G., Schieber, J., Thomas, N. H., Fischer, W. W., Fox, V. K., Stein, Nathan T., Nachon, M., Clark, Benton C., Kah, L. C., Thompson, L., Meyer, H. A., Gabriel, T. S. J., Hardgrove, Craig, Mangold, N., Rivera-Hernandez, F., Wiens, Roger Craig, and Vasavada, A. R. An interval of high salinity in ancient Gale crater lake on Mars. United States: N. p., 2019. Web. doi:10.1038/s41561-019-0458-8.
Rapin, William, Ehlmann, Bethany L., Dromart, G., Schieber, J., Thomas, N. H., Fischer, W. W., Fox, V. K., Stein, Nathan T., Nachon, M., Clark, Benton C., Kah, L. C., Thompson, L., Meyer, H. A., Gabriel, T. S. J., Hardgrove, Craig, Mangold, N., Rivera-Hernandez, F., Wiens, Roger Craig, & Vasavada, A. R. An interval of high salinity in ancient Gale crater lake on Mars. United States. https://doi.org/10.1038/s41561-019-0458-8
Rapin, William, Ehlmann, Bethany L., Dromart, G., Schieber, J., Thomas, N. H., Fischer, W. W., Fox, V. K., Stein, Nathan T., Nachon, M., Clark, Benton C., Kah, L. C., Thompson, L., Meyer, H. A., Gabriel, T. S. J., Hardgrove, Craig, Mangold, N., Rivera-Hernandez, F., Wiens, Roger Craig, and Vasavada, A. R. Mon . "An interval of high salinity in ancient Gale crater lake on Mars". United States. https://doi.org/10.1038/s41561-019-0458-8. https://www.osti.gov/servlets/purl/1734724.
@article{osti_1734724,
title = {An interval of high salinity in ancient Gale crater lake on Mars},
author = {Rapin, William and Ehlmann, Bethany L. and Dromart, G. and Schieber, J. and Thomas, N. H. and Fischer, W. W. and Fox, V. K. and Stein, Nathan T. and Nachon, M. and Clark, Benton C. and Kah, L. C. and Thompson, L. and Meyer, H. A. and Gabriel, T. S. J. and Hardgrove, Craig and Mangold, N. and Rivera-Hernandez, F. and Wiens, Roger Craig and Vasavada, A. R.},
abstractNote = {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. In this work, 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.},
doi = {10.1038/s41561-019-0458-8},
journal = {Nature Geoscience},
number = 11,
volume = 12,
place = {United States},
year = {Mon Oct 07 00:00:00 EDT 2019},
month = {Mon Oct 07 00:00:00 EDT 2019}
}

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Works referencing / citing this record:

Mars Science Laboratory Observations of Chloride Salts in Gale Crater, Mars
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