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

M. E. Schmidt, W. H. Farrand, J. R. Johnson, C. Schröder, J. A. Hurowitz, T. J. McCoy, Steven Ruff, R. E. Arvidson, D. J. Des Marais, K. W. Lewis, D. W. Ming, S. W. Squyres, P. A. de Souza

Research output: Contribution to journalArticle

38 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)258-266
Number of pages9
JournalEarth and Planetary Science Letters
Volume281
Issue number3-4
DOIs
StatePublished - May 15 2009

Keywords

  • Gusev Crater
  • Mars geology
  • hydrothermal alteration

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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    Schmidt, M. E., Farrand, W. H., Johnson, J. R., Schröder, C., Hurowitz, J. A., McCoy, T. J., Ruff, S., Arvidson, R. E., Des Marais, D. J., Lewis, K. W., Ming, D. W., Squyres, S. W., & de Souza, P. A. (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), 258-266. https://doi.org/10.1016/j.epsl.2009.02.030