Mathematics – Logic
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976sci...194.1288b&link_type=abstract
Science, vol. 194, Dec. 17, 1976, p. 1288-1293.
Mathematics
Logic
32
Chemical Composition, Landing Sites, Mars Surface, Mineral Exploration, Petrology, Viking Lander Spacecraft, Alkali Metals, Fines, Geochemistry, Igneous Rocks, Mineralogy, Soil Science, Trace Elements, Viking Mars Program
Scientific paper
Chemical results from four samples of Martian fines delivered to Viking landers 1 and 2 are remarkably similar in that they all have high iron; moderate magnesium, calcium, and sulfur; low aluminum; and apparently very low alkalies and trace elements. This composition is best interpreted as representing the weathering products of mafic igneous rocks. A mineralogic model, derived from computer mixing studies and laboratory analog preparations, suggests that Mars fines could be an intimate mixture of about 80% iron-rich clay, about 10% magnesium sulfate (kieserite), about 5% carbonate (calcite), and about 5% iron oxides (hematite, magnetite, maghemite, goethite). The mafic nature of the present fines (distributed globally) and their probable source rocks seems to preclude large-scale planetary differentiation of a terrestrial nature.
Baird Alexander K.
Christian R. P.
Clark Ben C.
Gooding James L.
Keil Klaus
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