0000000000065855

AUTHOR

Alfred S. Mcewen

showing 2 related works from this author

Field reconnaissance geologic mapping of the Columbia Hills, Mars, based on Mars Exploration Rover Spirit and MRO HiRISE observations

2011

Chemical, mineralogic, and lithologic ground truth was acquired for the first time on Mars in terrain units mapped using orbital Mars Reconnaissance Orbiter's High Resolution Imaging Science Experiment (MRO HiRISE) image data. Examination of several dozen outcrops shows that Mars is geologically complex at meter length scales, the record of its geologic history is well exposed, stratigraphic units may be identified and correlated across significant areas on the ground, and outcrops and geologic relationships between materials may be analyzed with techniques commonly employed in terrestrial field geology. Despite their burial during the course of Martian geologic time by widespread epiclasti…

MartianAtmospheric ScienceEcologyWater on MarsOutcropEarth scienceGeochemistryPaleontologySoil ScienceForestryEvidence of water on Mars from Mars OdysseyMars Exploration ProgramAquatic ScienceOceanographyGeologic recordGeologic mapGeophysicsSpace and Planetary ScienceGeochemistry and PetrologyEarth and Planetary Sciences (miscellaneous)Period (geology)GeologyEarth-Surface ProcessesWater Science and TechnologyJournal of Geophysical Research
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Pyroclastic Activity at Home Plate in Gusev Crater, Mars

2007

Home Plate is a layered plateau in Gusev crater on Mars. It is composed of clastic rocks of moderately altered alkali basalt composition, enriched in some highly volatile elements. A coarsegrained lower unit lies under a finer-grained upper unit. Textural observations indicate that the lower strata were emplaced in an explosive event, and geochemical considerations favor an explosive volcanic origin over an impact origin. The lower unit likely represents accumulation of pyroclastic materials, whereas the upper unit may represent eolian reworking of the same pyroclastic materials.

BasaltgeographyMultidisciplinarygeography.geographical_feature_categoryExplosive eruptionGeochemistryPyroclastic rockMineralogyVolcanic rockIgneous rockImpact craterPyroclastic surgeClastic rockGeologyScience
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