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Mineralogy at Gusev Crater from the Mossbauer spectrometer on the Spirit RoverMossbauer spectra measured on Mars by the Spirit rover during the primary mission are characterized by two ferrous iron doublets (olivine and probably pyroxene) and a ferric iron doublet (tentatively associated to nanophase ferric iron oxide). Two sextets resulting from nonstoichiometric magnetite are also present, except for a coating on the rock Mazatzal, where a hematite-like sextet is present. Greater proportions of ferric-bearing phases are associated with undisturbed soils and rock surfaces as compared to fresh rock surfaces exposed by grinding. The ubiquitous presence of olivine in soil suggests that physical rather than chemical weathering processes currently dominate at Gusev crater.
Document ID
20050151395
Acquisition Source
Johnson Space Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Morris, R. V.
(NASA Johnson Space Center Houston, TX United States)
Klingelhofer, G.
(Mainz Univ. Germany)
Bernhardt, B.
(Mainz Univ. Germany)
Schroder, C.
(Mainz Univ. Germany)
Rodionov, D. S.
(Mainz Univ. Germany)
De Souza, P. A. Jr
(Mainz Univ. Germany)
Yen, A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Gellert, R.
(Mainz Univ. Germany)
Evlanov, E. N.
(Academy of Sciences (Russia) Moscow, Russian Federation)
Foh, J.
(CVRD Group Victoria, Brazil)
Kankeleit, E.
(Academy of Sciences (Russia) Moscow, Russian Federation)
Gutlich, P.
(Mainz Univ. Germany)
Ming, D. W.
(Darmstadt Univ. of Technology Darmstadt, Germany)
Renz, F.
(Mainz Univ. Germany)
Wdowiak, T.
(Alabama Univ. Birmingham, AL, United States)
Squyres, S. W.
(Cornell Univ. Ithaca, NY, United States)
Arvidson, R. E.
(Washington Univ. Saint Louis, MO, United States)
Date Acquired
August 23, 2013
Publication Date
August 6, 2004
Publication Information
Publication: Science
Volume: 305
Issue: 5685
ISSN: 0036-8075
Subject Category
Lunar And Planetary Science And Exploration
Distribution Limits
Public
Copyright
Other

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