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Title: Alkali trace elements in Gale crater, Mars, with ChemCam: Calibration update and geological implications

The Chemistry Camera (ChemCam) instrument onboard Curiosity can detect minor and trace elements such as lithium, strontium, rubidium, and barium. Their abundances can provide some insights about Mars' magmatic history and sedimentary processes. We focus on developing new quantitative models for these elements by using a new laboratory database (more than 400 samples) that displays diverse compositions that are more relevant for Gale crater than the previous ChemCam database. These models are based on univariate calibration curves. For each element, the best model is selected depending on the results obtained by using the ChemCam calibration targets onboard Curiosity. New quantifications of Li, Sr, Rb, and Ba in Gale samples have been obtained for the first 1000 Martian days. Comparing these data in alkaline and magnesian rocks with the felsic and mafic clasts from the Martian meteorite NWA7533—from approximately the same geologic period—we observe a similar behavior: Sr, Rb, and Ba are more concentrated in soluble- and incompatible-element-rich mineral phases (Si, Al, and alkali-rich). Correlations between these trace elements and potassium in materials analyzed by ChemCam reveal a strong affinity with K-bearing phases such as feldspars, K-phyllosilicates, and potentially micas in igneous and sedimentary rocks. However, lithium is found in comparablemore » abundances in alkali-rich and magnesium-rich Gale rocks. This very soluble element can be associated with both alkali and Mg-Fe phases such as pyroxene and feldspar. Here, these observations of Li, Sr, Rb, and Ba mineralogical associations highlight their substitution with potassium and their incompatibility in magmatic melts.« less
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ; ORCiD logo [4] ; ORCiD logo [2] ; ORCiD logo [2] ; ORCiD logo [5] ; ORCiD logo [2] ; ORCiD logo [2] ; ORCiD logo [4] ;  [2] ;  [2] ; ORCiD logo [6] ;  [5] ; ORCiD logo [4] ; ORCiD logo [4]
  1. Univ. de Lorraine, Nancy (France)
  2. Univ. Paul Sabatier-OMP/CNRS, Toulouse (France)
  3. Museum d'Histoire Naturelle, Paris (France)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Lab. de Planetologie et Geodynamique, Nantes (France)
  6. Univ. of California, Davis, CA (United States)
Publication Date:
Report Number(s):
LA-UR-17-27691
Journal ID: ISSN 2169-9097; TRN: US1703019
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Planets
Additional Journal Information:
Journal Volume: 122; Journal Issue: 3; Journal ID: ISSN 2169-9097
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
National Aeronautic and Space Administration (NASA); USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Planetary Sciences; laser-induced breakdown spectroscopy; ChemCam; Mars Science Laboratory; trace elements; weathering; magmatic differentiation
OSTI Identifier:
1402650