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Browsing Department of Mineral Sciences by Author "Johnson, J. R."

Browsing Department of Mineral Sciences by Author "Johnson, J. R."

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  • Evidence for mechanical and chemical alteration of iron-nickel meteorites on Mars: Process insights for Meridiani Planum 
    Ashley, J. W.; Golombek, M. P.; Christensen, Philip R.; Squyres, Steven W.; McCoy, Timothy J.; Schroeder, C.; Fleischer, I.; Johnson, J. R.; Herkenhoff, Kenneth E.; Parker, T. J. (2011)
    The weathering of meteorites found on Mars involves chemical and physical processes that can provide clues to climate conditions at the location of their discovery. Beginning on sol 1961, the Opportunity rover encountered ...
  • Field Reconnaissance Geologic Mapping of the Columbia Hills, Mars Based on MER Spirit and MRO HiRISE Observations 
    Crumpler, L. S.; Arvidson, R. E.; Squyres, Steven W.; McCoy, Timothy J.; Yingst, A.; Ruff, S.; Farrand, W.; McSween, Harry Y.; Powell, M.; Ming, D. W.; Morris, R. V.; Bell, J. F., III; Grant, John A.; Greeley, Ronald; DesMarais, D.; Schmidt, M.; Cabrol, N. A.; Haldemann, A.; Lewis, K. W.; Wang, A. E.; Schroder, C.; Blaney, D.; Cohen, B.; Yen, A.; Farmer, J.; Gellert, R.; Guinness, E. A.; Herkenhoff, K. E.; Johnson, J. R.; Klingelhöfer, Göstar; McEwen, A.; Rice, Jr, J.W.; Rice, M. E.; deSouza, P.; Hurowitz, J. (2011)
  • Hydrothermal origin of halogens at Home Plate, Gusev Crater 
    Schmidt, M. E.; Ruff, S. W.; McCoy, Timothy J.; Farrand, W. H.; Johnson, J. R.; Gellert, R.; Ming, D. W.; Morris, R. V.; Cabrol, Nathalie A.; Lewis, K. W.; Schroeder, C. (2008)
    In the Inner Basin of the Columbia Hills, Gusev Crater is Home Plate, an 80 m platform of layered clastic rocks of the Barnhill class with microscopic and macroscopic textures, including a bomb sag, suggestive of a ...
  • Meteorites on Mars observed with the Mars Exploration Rovers 
    Schroeder, C.; Rodionov, D. S.; McCoy, Timothy J.; Jolliff, B. L.; Gellert, R.; Nittler, L. R.; Farrand, W. H.; Johnson, J. R.; Ruff, S. W.; Ashley, J. W.; Mittlefehldt, D. W.; Herkenhoff, Kenneth E.; Fleischer, I.; Haldemann, A. F. C.; Klingelhöfer, Göstar; Ming, D. W.; Morris, R. V.; de Souza, P. A.; Squyres, Steven W.; Weitz, Catherine M.; Yen, A. S.; Zipfel, J.; Economou, T. (2008)
    Reduced weathering rates due to the lack of liquid water and significantly greater typical surface ages should result in a higher density of meteorites on the surface of Mars compared to Earth. Several meteorites were ...
  • Spectral, mineralogical, and geochemical variations across Home Plate, Gusev Crater, Mars indicate high and low temperature alteration 
    Schmidt, M. E.; Farrand, W. H.; Johnson, J. R.; Schröder, C.; Hurowitz, J. A.; McCoy, Timothy J.; Ruff, S. W.; Arvidson, Raymond E.; Des Marais, D. J.; Lewis, K. W.; Ming, D. W.; Squyres, Steven W.; de, Souza,Jr (2009)
    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 ...

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