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

Citation

Schmidt, ME and Farrand, WH and Johnson, JR and Schroder, C and Hurowitz, JA and McCoy, TJ and Ruff, SW and Arvidson, RE and Marais, DJ and Lewis, KW and Ming, DW and Squyres, SW and de Souza Jr, PA, 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. ISSN 0012-821X (2009) [Refereed Article]


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Copyright Statement

Copyright 2009 Elsevier

DOI: doi:10.1016/j.epsl.2009.02.030

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.

Item Details

Item Type:Refereed Article
Keywords:Mars geology Gusev Crater hydrothermal alteration
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Exploration Geochemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:de Souza Jr, PA (Professor Paulo de Souza Junior)
ID Code:77614
Year Published:2009
Web of Science® Times Cited:32
Deposited By:Computing and Information Systems
Deposited On:2012-05-10
Last Modified:2012-06-28
Downloads:0

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