Geochemical and mineralogical interpretation of the Viking inorganic chemical results

Details Geochemical and mineralogical interpretation of the Viking inorganic chemical results Geochemical and mineralogical interpretation of the Viking inorganic chemical results

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.4625t&link_type=abstract

Journal of Geophysical Research, vol. 82, Sept. 30, 1977, p. 4625-4634.

Mathematics

Logic

111

Geochemistry, Mars Surface Samples, Mineralogy, Planetary Composition, Viking Lander Spacecraft, Chemical Analysis, Computer Techniques, Fines, Iron Oxides, Lithology, Oxidation, Petrology, Silicates

Scientific paper

The current status of geochemical, mineralogical, petrological interpretation of refined Viking Lander data is reviewed, and inferences that can be drawn from data on the composition of Martian surface materials are presented. The materials are dominantly fine silicate particles admixed with, or including, iron oxide particles. Both major element and trace element abundances in all samples are indicative of mafic source rocks (rather than more highly differentiated salic materials). The surface fines are nearly identical in composition at the two widely separated Lander sites, except for some lithologic diversity at the 100-m scale. This implies that some agency (presumably aeolian processes) has thoroughly homogenized them on a planetary scale. The most plausible model for the mineralogical constitution of the fine-grained surface materials at the two Lander sites is a fine-grained mixture dominated by iron-rich smectites, or their degradation products, with ferric oxides, probably including maghemite and carbonates (such as calcite), but not such less stable phases as magnesite or siderite.

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