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Title: The potassic sedimentary rocks in Gale Crater, Mars, as seen by ChemCam on board Curiosity: Potassic Sedimentary Rocks, Gale Crater

Journal Article · · Journal of Geophysical Research. Planets
 [1];  [1];  [2];  [2];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [7];  [4];  [9];  [10];  [2];  [11];  [12];  [4];  [13] more »;  [2];  [14];  [2];  [1];  [15];  [6];  [2];  [16];  [17];  [18] « less
  1. Univ. of Nantes (CNRS-UMR) (France). Lab. of Planetology and Geodynamics
  2. Inst. for Research in Astrophysics and Planetology, Toulouse (France)
  3. Inst. for Research in Astrophysics and Planetology, Toulouse (France). Inst. of Optical Sensor Systems
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Univ. of California, Davis, CA (United States). Earth and Planetary Sciences
  6. Univ. of Lorraine, Nancy (France). GeoRessources
  7. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.
  8. U.S. Geological Survey, Flagstaff, AZ (United States). Astrogeology Science Center
  9. Lyon Lab. of Geology (France)
  10. Oregon State Univ., Corvallis, OR (United States). College of Earth, Ocean and Atmospheric Sciences
  11. California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Geologic and Planetary Sciences
  12. Imperial College London, London (United Kingdom)
  13. Laboratoire de Planétologie et Géodynamique, LPG-Nantes, UMR CNRS 6112, Université de Nantes, Nantes France
  14. State Univ. of New York (SUNY), Stony Brook, NY (United States). Dept. of Geosciences
  15. Univ. of New Mexico, Albuquerque, NM (United States). Inst. of Meteroritics
  16. Western Washington Univ., Bellingham, WA (United States). Geology Dept.
  17. Natural Museum of History, Paris (France). Lab. of Mineralogy & Cosmochemistry of the Museum (LMCM)
  18. Lunar and Planetary Inst., Houston TX (United States)

The Mars Science Laboratory rover Curiosity encountered potassium-rich clastic sedimentary rocks at two sites in Gale Crater, the waypoints Cooperstown and Kimberley. These rocks include several distinct meters thick sedimentary outcrops ranging from fine sandstone to conglomerate, interpreted to record an ancient fluvial or fluvio-deltaic depositional system. Furthermore, from ChemCam Laser-Induced Breakdown Spectroscopy (LIBS) chemical analyses, this suite of sedimentary rocks has an overall mean K2O abundance that is more than 5 times higher than that of the average Martian crust. The combined analysis of ChemCam data with stratigraphic and geographic locations then reveals that the mean K2O abundance increases upward through the stratigraphic section. Chemical analyses across each unit can be represented as mixtures of several distinct chemical components, i.e., mineral phases, including K-bearing minerals, mafic silicates, Fe-oxides, and Fe-hydroxide/oxyhydroxides. Possible K-bearing minerals include alkali feldspar (including anorthoclase and sanidine) and K-bearing phyllosilicate such as illite. Mixtures of different source rocks, including a potassium-rich rock located on the rim and walls of Gale Crater, are the likely origin of observed chemical variations within each unit. Physical sorting may have also played a role in the enrichment in K in the Kimberley formation. The occurrence of these potassic sedimentary rocks provides additional evidence for the chemical diversity of the crust exposed at Gale Crater.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1417817
Report Number(s):
LA-UR-17-27707
Journal Information:
Journal of Geophysical Research. Planets, Journal Name: Journal of Geophysical Research. Planets Journal Issue: 5 Vol. 121; ISSN 2169-9097
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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