Spectral, mineralogical, and geochemical variations across Home Plate, Gusev Crater, Mars indicate high and low temperature alteration

a Dept. of Mineral Sciences, Smithsonian Institution, Washington, DC 20560, United States b Space Science Institute, Boulder, Colorado 80301, United States c Astrogeology Team, United States Geological Survey, Flagstaff, Arizona 86001, United States d Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg Universität, D-55128 Mainz, Germany e Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States f School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, United States g Dept. of Earth and Planetary Sciences, Washington University, St. Louis, MO 63130, United States h Exobiology Branch, NASA Ames Research Center, Moffett Field, CA 94035, United States i Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States j NASA Johnson Space Center, Houston, TX 77058, United States k Dept. of Astronomy, Space Sciences Bldg., Cornell University, Ithaca, NY 14853, United States l Tasmanian ICT Center, CSIRO, Hobart, TAS 7000, Australia