Computer Science
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mmws.work...36m&link_type=abstract
Workshop on the Issue Martian Meteorites: Where do we Stand and Where are we Going?, p. 36
Computer Science
Mars Surface, Oxides, Planetary Geology, Sulfur, Basalt, Crystallization, Snc Meteorites, Mars Pathfinder, Silicon Dioxide, X Ray Spectrometers, Mineralogy
Scientific paper
In July 1997, the Mars Pathfinder mission touched down in the Ares Valles region of Mars to begin its scientific study of the Red Planet. The Sojourner rover used its onboard cameras and Alpha-proton X-ray spectrometer (APXS) to study the soils and rocks of the landing site. Currently, preliminary analyses of five rock samples and six soil samples have been completed. They are based only on the spectra obtained from the X-ray portion of the APXS. When plotted on oxide vs. Sulfur diagrams, the Pathfinder soil and rock data fall on a line extending between the soil data, which fall at high Sulfur contents, and the rock data, which fall at lower S contents. Because the solubility of Sulfur in basaltic melts is less than or equal to 0.2 percent of weight, the range of Sulfur contents in the rocks implies that each rock analysis has a differing amount of soil component. The rock compositions, therefore, fall along a mixing line between the soils and a hypothetical "Sulfur-free" rock obtained by extrapolating the regression line through the soil and rock data back to 0 percent of weight Sulfur. The composition of the S-free rock is contained in an accompanying table. Accepting the argument that the Pathfinder rocks are igneous, as done by some, the Sulfur-free rock may be classified by its SiO2 and alkali content an andesite. The Sulfur-free rock has the characteristic low Al2O3 and high FeO content expected from martian igneous rocks
Minitti Michelle E.
Rutherford Malcolm J.
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