Science · 2004 · 265 citations · 15 references
Natural SciencesEarth SciencesGeologyGeochemistryMineralogyPetrologyIgneous MineralsMartian GeologyPetrographyPlanetary PetrologySilicate MineralsVolcanic RocksAlpha-particle EmissionAlpha-particle SpectroscopyAlterationBasalt PetrologyBasaltic Magma CompositionDust MantlesMartian MineralogyMartian Petrology
The Spirit landing site in Gusev Crater on Mars contains dark, fine-grained, vesicular rocks interpreted as lavas. Pancam and Mini-Thermal Emission Spectrometer (Mini-TES) spectra suggest that all of these rocks are similar but have variable coatings and dust mantles. Magnified images of brushed and abraded rock surfaces show alteration rinds and veins. Rock interiors contain </=25% megacrysts. Chemical analyses of rocks by the Alpha Particle X-ray Spectrometer are consistent with picritic basalts, containing normative olivine, pyroxenes, plagioclase, and accessory FeTi oxides. Mössbauer, Pancam, and Mini-TES spectra confirm the presence of olivine, magnetite, and probably pyroxene. These basalts extend the known range of rock compositions composing the martian crust.
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The Spirit Rover's Athena Science Investigation at Gusev Crater, Mars
S. W. Squyres, R. E. Arvidson, J. F. Bell et al. · Science · 2004 · 447 citations
Chemistry of Rocks and Soils in Gusev Crater from the Alpha Particle X-ray Spectrometer
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