|Appears in Collections:||Biological and Environmental Sciences Journal Articles|
|Peer Review Status:||Refereed|
|Title:||Mineralogy at Gusev crater from the Mössbauer spectrometer on the Spirit rover|
|Author(s):||Morris, Richard Van|
Rodionov, Daniel S
de, Souza Jr Paulo A
Yen, Albert S
Evlanov, E N
Ming, Douglas Wayne
Wdowiak, Thomas J
Squyres, Steven W
Arvidson, Raymond E
|Citation:||Morris RV, Klingelhoefer G, Bernhardt B, Schröder C, Rodionov DS, de Souza Jr PA, Yen AS, Gellert R, Evlanov EN, Foh J, Kankeleit E, Gutlich P, Ming DW, Renz F, Wdowiak TJ, Squyres SW & Arvidson RE (2004) Mineralogy at Gusev crater from the Mössbauer spectrometer on the Spirit rover, Science, 305 (5685), pp. 833-836.|
|Abstract:||Mössbauer 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 rockMazatzal, 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 rocksurfaces exposed by grinding. The ubiquitous presence of olivine in soil suggests that physical rather than chemical weathering processes currently dominate at Gusev crater.|
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