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  • 11
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    Iron-sulfur mineralogy of Mars - Magmatic evolution and chemical weathering products (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Models are developed for the magmatic evolution and the oxidative weathering of sulfide minerals on Mars, based on petrogenetic associations among komatiitic rock types, Viking geochemical data, SNC meteorites, and terrestrial Fi-Ni deposits. The weathering model was tested by exposing komatiitic pyrrhotites and olivines to sulfuric acid solutions, with or without dissolved ferric iron, and identifying the reaction products by Moessbauer spectroscopy. The results suggest that, on Mars, acidic groundwater has induced oxidative weathering of pyrrhotite, yielding FeS2 and then FeOOH.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 14415-14
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Evolution of sulfide mineralization on Mars (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: It has been previously suggested, on the basis of compositional and petrographic similarities noted between komatites, SNC meteorites, and the silicate portion of the Martian regolith fines, that iron-sulfide ore deposites may exist on Mars. This paper examines the possible locations of Archean-type sulfide and related ore deposits on Mars, their evolution, and the emplacement mechanisms for the ore deposit. The clues to these questions are deduced by applying to Mars the temporal patterns of ore distribution on earth and the experimental observations on sulfur solubility in basaltic melts.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 14169-14
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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    Rates of oxidative weathering on the surface of Mars (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: A model of acid weathering is proposed for the iron-rich basalts on Mars. Aqueous oxidation of iron sulfides released SO4(2-) and H(+) ions that initiated the dissolution of basaltic ferromagnesian silicates and released Fe(2+) ions. The Fe(2+) ions eventually underwent ferrolysis reactions and produced insoluble hydrous ferric oxide phases. Measurements of the time-dependence of acid weathering reactions show that pyrrhotite is rapidly converted to pyrite plus dissolved ferrous iron, the rate of pyrite formation decreasing with rising pH and lower temperatures. On Mars, oxidation rates of dissolved Fe(2+) ions in equatorial melt-waters in contact with the atmosphere are estimated to lie in the range 0.3-3.0 ppb Fe/yr over the pH range 2 to 6. Oxidation of Fe(2+) ions is estimated to be extremely slow in brine eutectic solutions that might be present on Mars and to be negligible in the frozen regolith.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; E2; p. 3365-3372.
    Format: text
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    NASA TECHNICAL REPORTS
  • 14
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    Reaction of Pt3(CO)3(P-tert-Bu2Ph)3 and hydrogen chloride. The x-ray structure of Pt2Cl2(CO)2(P-tert-Bu2Ph)2 (1987)
    American Chemical Society
    Details
    Publication Date: 1987-03-01
    Print ISSN: 0276-7333
    Electronic ISSN: 1520-6041
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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    PAPER CURRENT
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