Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/17166
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Spectral, mineralogical, and geochemical variations across Home Plate, Gusev Crater, Mars indicate high and low temperature alteration
Authors: Schmidt, Mariek E
Farrand, William H
Johnson, Jeffrey R
Schröder, Christian
Hurowitz, Joel A
McCoy, Timothy J
Ruff, Steven W
Arvidson, Raymond E
DesMarais, David J
Lewis, Kevin W
Ming, Douglas Wayne
Squyres, Steven W
de, Souza Jr Paulo A
Contact Email: christian.schroeder@stir.ac.uk
Keywords: Mars geology
Gusev Crater
hydrothermal alteration
Issue Date: 15-May-2009
Publisher: Elsevier
Citation: Schmidt ME, Farrand WH, Johnson JR, Schröder C, Hurowitz JA, McCoy TJ, Ruff SW, Arvidson RE, DesMarais DJ, Lewis KW, Ming DW, Squyres SW & de Souza Jr PA (2009) Spectral, mineralogical, and geochemical variations across Home Plate, Gusev Crater, Mars indicate high and low temperature alteration, Earth and Planetary Science Letters, 281 (3-4), pp. 258-266.
Abstract: Over the last ~3 years in Gusev Crater, Mars, the Spirit rover observed coherent variations in color, mineralogy, and geochemistry across Home Plate, an ~80 m-diameter outcrop of basaltic tephra. Observations of Home Plate from orbit and from the summit of Husband Hill reveal clear differences in visible/near-infrared (VNIR) colors between its eastern and western regions that are consistent with mineralogical compositions indicated by Mössbauer spectrometer (MB) and by Miniature Thermal Emission Spectrometer (Mini-TES). Pyroxene and magnetite dominate the east side, while olivine, nanophase Fe oxide (npOx) and glass are more abundant on the western side. Alpha Particle X-Ray Spectrometer (APXS) observations reveal that eastern Home Plate has higher Si/Mg, Al, Zn, Ni, and K, while Cl and Br are higher in the west. We propose that these variations are the result of two distinct alteration regimes that may or may not be temporally related: a localized, higher temperature recrystallization and alteration of the east side of Home Plate and lower temperature alteration of the western side that produced npOx.
Type: Journal Article
URI: http://hdl.handle.net/1893/17166
DOI Link: http://dx.doi.org/10.1016/j.epsl.2009.02.030
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Smithsonian
Space Science Institute
U.S. Geological Survey
Biological and Environmental Sciences
California Institute of Technology
Smithsonian
Arizona State University
Washington University In Saint Louis
National Aeronautics and Space Administration (NASA)
California Institute of Technology
National Aeronautics and Space Administration (NASA)
Cornell University
University of Tasmania

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