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Mineralogy of volcanic rocks in Gusev Crater, Mars: Reconciling Mössbauer, Alpha Particle X-Ray Spectrometer, and Miniature Thermal Emission Spectrometer spectra
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee, USA
Department of Geological Sciences, Arizona State University, Tempe, Arizona, USA
NASA Johnson Space Center, Houston, Texas, USA
Department of Physics, University of Guelph, Guelph, Ontario, Canada
Institut fur Anorganische und Analytische Chemie, Johannes Gutenberg-Universität, Mainz, Germany
Department of Geological Sciences, Arizona State University, Tempe, Arizona, USA
National Museum of Natural History, Smithsonian Institution, Washington, D. C., USA
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee, USA
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee, USA
NASA Marshall Space Flight Center, Huntsville, Alabama, USA
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA
Institut fur Anorganische und Analytische Chemie, Johannes Gutenberg-Universität, Mainz, Germany
Department of Astronomy, Cornell University, Ithaca, New York, USA
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
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.
Received 20 July 2007; accepted 23 January 2008; published 29 May 2008.
Citation: (2008), Mineralogy of volcanic rocks in Gusev Crater, Mars: Reconciling Mössbauer, Alpha Particle X-Ray Spectrometer, and Miniature Thermal Emission Spectrometer spectra, J. Geophys. Res., 113, E06S04, doi:10.1029/2007JE002970.
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