Journal
GEOLOGY
Volume 41, Issue 10, Pages 1103-1106Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G34613.1
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Funding
- CRISM APL/JPL contract [104149]
- National Science Foundation [DGE-1143954]
- NASA Mars Fundamental Research Program [NNX11AH09G]
- Mars Exploration Program
- NASA [NNX11AH09G, 144832] Funding Source: Federal RePORTER
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Oversampled Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) visible and near-infrared hyperspectral data over Mount Sharp in Gale Crater, Mars, were used to generate spatially sharpened maps of the location of red crystalline hematite within the uppermost stratum of an similar to 6.5-km-long ridge on the mound's northern flank. Finely layered strata underlie the ridge to the north and have dips consistent with the nearby Mount Sharp sedimentary sequence. Fe-Mg smectites are exposed in a valley to the south of the ridge. Emplacement of the hematite is hypothesized to result either from exposure of anoxic Fe2+-rich ground-water to an oxidizing environment, leading to precipitation of hematite or its precursors, or from in-place weathering of precursor silicate materials under oxidizing conditions. These hypotheses and implications for habitability will be testable with in situ measurements by the Mars rover Curiosity when it reaches Mount Sharp.
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