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Mineralogy of the Paso Robles soils on Mars

Melissa D. Lane, Janice L. Bishop, M. Darby Dyar, Penelope L. King, Mario Parente and Brendt C. Hyde
Mineralogy of the Paso Robles soils on Mars
American Mineralogist (May 2008) 93 (5-6): 728-739


Visible, near-infrared, thermal, and Mossbauer spectroscopic data from the exposed, bright track soil at the "Paso Robles" site within Gusev crater, Mars, indicate the presence of Fe (super 3+) -sulfates and possibly Fe (super 3+) -phosphates admixed with the host soil. When the spectroscopic analyses are combined with constraints imposed by chemical data, the determined dominant Fe (super 3+) -sulfate component is hydrous, and all of the spectroscopic methods suggest that it is probably ferricopiapite or some closely related, structurally similar species, possibly mixed with other Fe (super 3+) sulfates such as butlerite or parabutlerite, or perhaps (para)coquimbite, fibroferrite, or metahohmanite. Such an assemblage is consistent with formation in a highly oxidized, relatively dehydrated environment with the bulk-sulfate assemblage having OH/(OH+2SO (sub 4) ) of < approximately 0.4. Some Fe (super 3+) is likely to be associated with phosphates in the soil in the form of ferristrunzite or strengite.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 93
Serial Issue: 5-6
Title: Mineralogy of the Paso Robles soils on Mars
Affiliation: Planetary Science Institute, Tucson, AZ, United States
Pages: 728-739
Published: 200805
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 48
Accession Number: 2008-091796
Categories: Extraterrestrial geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: NASA, Ames Research Center, USA, United StatesMount Holyoke College, USA, United StatesUniversity of Western Ontario, CAN, CanadaStanford University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200829
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