Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgre..11306s04m&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue E6, CiteID E06S04
Physics
26
Mineralogy And Petrology: Mineral And Crystal Chemistry (1042), Mineralogy And Petrology: Planetary Mineralogy And Petrology (5410), Mineralogy And Petrology: Instruments And Techniques, Planetary Sciences: Solid Surface Planets: Surface Materials And Properties
Scientific paper
Complete sets of mineral abundances for relatively unaltered volcanic or volcaniclastic rocks in Gusev Crater have been determined by modeling Mössbauer subspectral areas as mineral weight percentages, and combining those percentages with the proportions of iron-free minerals not detected by Mössbauer (normative plagioclase, apatite, and chromite, as calculated from Alpha Particle X-Ray Spectrometer (APXS) chemical analyses). Comparisons of synthetic thermal emission spectra calculated for these mineral modes with measured Miniature Thermal Emission Spectrometer (Mini-TES) spectra for the same rock classes show either good agreements or discrepancies that we attribute to sodic plagioclase compositions or unmodeled sulfate, glass, or pigeonite. The normative compositions of olivine, pyroxene, and feldspar calculated from APXS data are consistent with spectroscopic constraints on mineral compositions. Systematic variations between olivine abundances in APXS norms (which sample tens of micrometers depth) and olivine proportions measured by Mössbauer (which sample hundreds of micrometers depth) support the hypothesis that dissolution of olivine by acidic fluids has occurred on weathered rock surfaces.
Christensen Per Rex
Cohen Adam B.
Crisp John
Deanne Rogers A.
Gellert Ralf
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