Basaltic Rocks Analyzed by the Spirit Rover in Gusev Crater

作者：H. Y. McSween, R. E. Arvidson, J. F. Bell, D. L. Blaney, Nathalie A. Cabrol, P. R. Christensen, B. C. Clark, J. A. Crisp, L. S. Crumpler, David J. Des Marais, Jack D. Farmer, R. Gellert, A. Ghosh, S. Gorevan, T. G. Graff, J. A. Grant, L. A. Haskin, K. E. Herkenhoff, J. R. Johnson, B. L. Jolliff, G. Klingelhoefer, A. T. Knudson, S. M. McLennan, K. A. Milam, J. E. Moersch, R. V. Morris, R. Rieder, Steven W. Ruff, Paulo de Souza, S. W. Squyres, H. Wänke, A. Wang, M. B. Wyatt, A. S. Yen, J. Zipfel · 发表于：Science · 年份：2004 · DOI：10.1126/science.3050842 · 被引用次数：265 · 研究领域：Planetary Science and Exploration、Astro and Planetary Science、Geological and Geochemical Analysis

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.