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Textures of the Soils and Rocks at Gusev Crater from Spirit's Microscopic Imager
K. E. Herkenhoff,1*S. W. Squyres,2R. Arvidson,3D. S. Bass,4J. F. Bell, III,2P. Bertelsen,5N. A. Cabrol,6L. Gaddis,1A. G. Hayes,2S. F. Hviid,7J. R. Johnson,1K. M. Kinch,8M. B. Madsen,5J. N. Maki,4S. M. McLennan,9H. Y. McSween,10J. W. Rice, Jr.,11M. Sims,12P. H. Smith,13L. A. Soderblom,1N. Spanovich,13R. Sullivan,2A. Wang14
The Microscopic Imager on the Spirit rover analyzed the texturesof the soil and rocks at Gusev crater on Mars at a resolutionof 100 micrometers. Weakly bound agglomerates of dust are presentin the soil near the Columbia Memorial Station. Some of thebrushed or abraded rock surfaces show igneous textures and evidencefor alteration rinds, coatings, and veins consistent with secondarymineralization. The rock textures are consistent with a volcanicorigin and subsequent alteration and/or weathering by impactevents, wind, and possibly water.
1 U.S. Geological Survey Astrogeology Team, Flagstaff, AZ 86001, USA. 2 Department of Astronomy, Space Sciences Building, Cornell University, Ithaca, NY 14853, USA. 3 Department of Earth and Space Sciences, Washington University, St. Louis, MO 63130, USA. 4 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA. 5 Center for Planetary Science, Danish Space Research Institute and Niels Bohr Institute for Astronomy, Physics, and Geophysics, University of Copenhagen, Denmark. 6 NASA Ames Research Center/SETI Institute, Moffett Field, CA 94035, USA. 7 Max Planck Institut für Aeronomie, Katlenburg-Lindau, D-37191, Germany. 8 Institute of Physics and Astronomy, Aarhus University, Aarhus, Denmark. 9 State University of New York, Department of Geosciences, Stony Brook, NY 11794, USA. 10 Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996, USA. 11 Arizona State University, Department of Geological Sciences, Tempe, AZ 85287, USA. 12 NASA Ames Research Center, Moffett Field, CA 94035, USA. 13 University of Arizona, Lunar and Planetary Laboratory, Tucson, AZ 85721, USA. 14 Department of Earth and Space Sciences and McDonnell Center for Space Sciences, Washington University, St. Louis, MO 63130, USA.
* To whom correspondence should be addressed. E-mail: kherkenhoff{at}usgs.gov
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