Mineralogy at Gusev Crater from the Mossbauer Spectrometer on the Spirit Rover

作者：R. V. Morris, G. Klingelhöfer, B. Bernhardt, Christian Schröder, D. Rodionov, Paulo de Souza, A. S. Yen, R. Gellert, E. N. Evlanov, J. Foh, E. Kankeleit, Philipp Gütlich, D. W. Ming, Franz Renz, T. J. Wdowiak, S. W. Squyres, R. E. Arvidson · 发表于：Science · 年份：2004 · DOI：10.1126/science.1100020 · 被引用次数：295 · 研究领域：Planetary Science and Exploration、Geomagnetism and Paleomagnetism Studies、Astro and Planetary Science

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 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.