skip to main content

DOE PAGESDOE PAGES

Title: Hydration state of calcium sulfates in Gale crater, Mars: Identification of bassanite veins

In-situ analyses reveal the presence of hydrogen within calcium sulfate veins crosscutting the sediments found in Gale crater. Laboratory experiments were performed to calibrate the hydrogen signal measured by laser induced breakdown spectroscopy (LIBS) in a range applicable to martian data. The analyses indicate that all veins targeted so far at Gale consist predominantly of bassanite which most likely formed by dehydration of gypsum. This scenario thus suggests that the percolating water produced gypsum, possibly by hydration of anhydrite in aqueous solution, and remained at temperatures below ~60 °C at that time. Desiccating conditions followed, consistent with a hyperarid climate and favored by burial or impacts. In addition, anhydrite with lesser bassanite has been found by XRD in samples of sediments hosting the veins. Our result suggests bassanite is likely found in the veins and anhydrite may be more common as a fine-grained component within the sediments.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [1] ;  [1] ; ORCiD logo [5] ;  [6] ;  [1] ;  [7] ;  [1] ;  [8] ;  [9]
  1. Univ. of Toulouse (France). Midi-Pyrenees Observatory (OMP); National Centre for Scientific Research (CNRS), Toulouse (France). Inst. for Research in Astrophysics and Planetology (IRAP)
  2. Planetary Science Inst., Tucson, AZ (United States)
  3. National Centre for Scientific Research (CNRS), Nantes (France). Lab. of Planetology and Geodynamics
  4. National Centre for Scientific Research (CNRS), Toulouse (France). Inst. for Research in Astrophysics and Planetology (IRAP)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Univ. of Michigan, Ann Arbor, MI (United States)
  7. Museum of Natural History, Paris (France). Lab. of Mineralogy & Cosmochemistry of the Museum (LMCM)
  8. NASA Johnson Space Center, Houston, TX (United States). Aerodyne Industries
  9. NASA Johnson Space Center, Houston, TX (United States)
Publication Date:
Report Number(s):
LA-UR-17-27695
Journal ID: ISSN 0012-821X
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Earth and Planetary Science Letters
Additional Journal Information:
Journal Volume: 452; Journal Issue: C; Journal ID: ISSN 0012-821X
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
National Aeronautics and Space Administration (NASA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 58 GEOSCIENCES; mars; calcium sulfate; bassanite; LIBS; hydrogen; ChemCam
OSTI Identifier:
1417814