The Chemical Composition of Martian Soil and Rocks Returned by the Mobile Alpha Proton X-ray Spectrometer: Preliminary Results from the X-ray Mode

R. Rieder, T. Economou, Wä, H. nke, A. Turkevich, J. Crisp, Brü, J. ckner, G. Dreibus, McSween Jr. H. Y. , Science Magazine

This article presents the chemical composition of six soils and five rocks at the Ares Vallis landing site obtained by the alpha proton x-ray spectrometer on board the rover of the Mars Pathfinder mission. The analyzed rocks were compositionally similar to each other, but were unexpectedly high in silica and potassium and low in magnesium compared to previously studied Martian soils and meteorites. The analyzed rocks are similar in composition to terrestrial andesites and close to the mean composition of Earth's crust. Soil analyses appear similar to those determined by the Viking missions.

Subject: Geoscience:Lunar and Planetary Science:Mars:Martian Meteorites, Geoscience:Geology:Igneous and Metamorphic Petrology, Mineralogy:Mineral Analysis, Geoscience:Geology:Geochemistry:Geochemical Analysis, Geoscience:Lunar and Planetary Science:Mars:Volcanology/Petrology, Geoscience:Lunar and Planetary Science:Mars
Resource Type: Audio/Visual:Images/Illustrations, Scientific Resources:Overview/Reference Work
Topics: Solar system:Mars:Martian Meteorites, Volcanology/Petrology, Solid Earth:Petrology, Mineralogy:Mineral Analysis, Solar system:Mars, Solid Earth:Geochemistry:Geochemical Analysis
Theme: Teach the Earth:Course Topics:Geochemistry, Mineralogy, Planetary Science, PetrologyKeyword: APXS