Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..158m&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 158-159 (SEE N92-10728 01-91)
Physics
Geophysics
Mars Surface, Planetary Composition, Planetary Crusts, Soils, Sulfur Oxides, Penetration, Planetary Evolution, Sampling, Viking Mars Program
Scientific paper
Three distinct soillike materials sampled by the Viking landers (VL) on Mars are (in order of increasing strength): (1) drift; (2) crusty to cloddy; and (3) blocky. Relative strengths of these materials are manifested by footpad penetrations during landing (VL 1), depths of deep holes, motor currents during sampling, sampler backhoe penetrations, comminutor motor currents, impact pits, trench tailings, and successful acquisitions of the coarse fraction (only blocky material). Cementation by S Cl compounds probably contributes to the relative strengths. This is shown where the weight pct. of SO3 + Cl of each material is plotted against their relative strengths. A similar result is obtained using SO3 alone, but not with Cl which is deficient in VL 2 samples.
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