Hydration state of calcium sulfates in Gale crater, Mars [electronic resource] : Identification of bassanite veins
- Washington, D.C. : National Aeronautics and Space Administration Announcement, 2016. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- pages 197-205 : digital, PDF file
- Additional Creators:
- Los Alamos National Laboratory, National Aeronautics and Space Administration Announcement, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- 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.
- Published through SciTech Connect., 08/17/2016., "la-ur--17-27695", Earth and Planetary Science Letters 452 C ISSN 0012-821X AM, and W. Rapin; P. -Y. Meslin; S. Maurice; D. Vaniman; M. Nachon; N. Mangold; S. Schröder; O. Gasnault; O. Forni; R. C. Wiens; G. M. Martínez; A. Cousin; V. Sautter; J. Lasue; E. B. Rampe; D. Archer.
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