Physics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993chwe.work....8b&link_type=abstract
In Lunar and Planetary Inst., MSATT Workshop on Chemical Weathering on Mars p 8-9 (SEE N93-31933 12-91)
Physics
Basalt, Color, Iron, Mars Surface, Mineralogy, Minerals, Oxidation, Petrography, Planetary Evolution, Planetary Geology, Reaction Kinetics, Weathering, Clays, Igneous Rocks, Meteorites, Oxides, Polymerization, Regolith, Rocks, Spectroscopy
Scientific paper
Perhaps the most conspicuous indication that chemical weathering has occurred on the surface of Mars is the overall color of the red planet and the spectroscopic features that identify ferric-bearing assemblages in the martian regolith. Apparently, Fe(2+) ions in primary minerals in parent igneous rocks on the martian surface have been oxidized to ferric iron, which occurs in degradation products that now constitute the regolith. The mineralogy of the unweathered igneous rocks prior to weathering on the martian surface is reasonably well constrained, mainly as a result of petrographic studies of the SNC meteorites. However, the alteration products resulting from oxidative weathering of these rocks are less well-constrained. The topics covered include the following: primary rocks subjected to chemical weathering; dissolution processes; oxidation of dissolved Fe(2+); mechanism of polymerization of hydrous ferric oxides; terrestrial occurrences of ferromagnesian smectites; and dehydroxylated Mg-Fe smectites on Mars.
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