Silica-Rich Deposits and Hydrated Minerals at Gusev Crater, Mars: Vis-NIR Spectral Characterization and Regional Mapping
Icarus 205 (2010) 375–395 Contents lists available at ScienceDirect Icarus journal homepage: www.elsevier.com/locate/icarus Silica-rich deposits and hydrated minerals at Gusev Crater, Mars: Vis-NIR spectral characterization and regional mapping M.S. Rice a,*, J.F. Bell III a, E.A. Cloutis b, A. Wang c, S.W. Ruff d, M.A. Craig e, D.T. Bailey b, J.R. Johnson f, P.A. de Souza Jr. g, W.H. Farrand h a Department of Astronomy, Cornell University, Ithaca, NY 14853, USA b Department of Geography, University of Winnipeg, 515 Portage Ave., Winnipeg, Man., Canada R3B 2E9 c Department of Earth and Planetary Science and McDonnell Center for Space Science, Washington University, St. Louis, MO 63130, USA d School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA e Department of Earth Sciences, University of Western Ontario, 1151 Richmond St. Louis, Ont., Canada N6A 5B7 f Astrogeology Team, United States Geological Survey, Flagstaff, AZ 86001, USA g Tasmanian ICT Center, CSIRO, Hobart, Tasmania 7000, Australia h Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301, USA article info abstract Article history: The Mars Exploration Rover (MER) Spirit has discovered surprisingly high concentrations of amorphous Received 7 January 2009 silica in soil and nodular outcrops in the Inner Basin of the Columbia Hills. In Pancam multispectral obser- Revised 24 March 2009 vations, we find that an absorption feature at the longest Pancam wavelength (1009 nm) appears to be Accepted 31 March 2009 characteristic of these silica-rich materials; however, spectral analyses of amorphous silica suggest that Available online 8 May 2009 the 1009 nm spectral feature is not a direct reflection of their silica-rich nature.
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