Iron-sulfur mineralogy of Mars - Magmatic evolution and chemical weathering products

Details Iron-sulfur mineralogy of Mars - Magmatic evolution and chemical weathering products Iron-sulfur mineralogy of Mars - Magmatic evolution and chemical weathering products

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9514415b&link_type=abstract

(American Geophysical Union and Geological Society of America, International Conference on Mars, 4th, Tucson, AZ, Jan. 10-13, 19

Mathematics

Logic

53

Magma, Mars Surface, Mineralogy, Planetary Evolution, Regolith, Sulfides, Iron, Meteorites, Olivine, Pyrrhotite, Sulfur, Weathering

Scientific paper

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.

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