6533b7ddfe1ef96bd12754ff

RESEARCH PRODUCT

Basaltic Rocks Analyzed by the Spirit Rover in Gusev Crater

James F. BellKeith A. MilamLarry S. CrumplerRaymond E. ArvidsonLarry A. HaskinJeffrey E. MoerschRudolf RiederJoy A. CrispScott M. MclennanDavid J. Des MaraisPhilip R. ChristensenSteven W. RuffJeffrey R. JohnsonJohn A. GrantAlbert S. YenN. A. CabrolG. KlingelhoeferTrevor G. GraffA. T. KnudsonBenton C. ClarkP. A. De SouzaRichard V. MorrisA. GhoshJutta ZipfelRalf GellertHeinrich WänkeS. P. GorevanJack D. FarmerK. E. HerkenhoffDiana L. BlaneyAlian WangSteven W. SquyresBradley L. JolliffHarry Y. McsweenMichael B. Wyatt

subject

Geologic SedimentsExtraterrestrial EnvironmentMagnesium CompoundsMarsMineralogyPyroxeneengineering.materialFeldsparSpectroscopy MossbauerPlagioclaseComposition of MarsBasaltMineralsgeographyMultidisciplinarygeography.geographical_feature_categoryOlivineSilicatesSpectrum AnalysisWaterOxidesVolcanic rockIgneous rockvisual_artengineeringvisual_art.visual_art_mediumIron CompoundsGeology

description

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.

https://doi.org/10.1126/science.3050842