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Elemental Geochemistry of Sedimentary Rocks at Yellowknife Bay, Gale Crater, Mars
Department of Geosciences, State University of New York, Stony Brook.
U.S. Geological Survey, Astrogeology Science Center, Flagstaff.
School of Earth and Space Exploration, Arizona State University.
Space Research Centre, Department of Physics and Astronomy, University of Leicester.
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Number of Authors: 522014 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 343, no 6169, article id 1244734Article in journal (Refereed) Published
Abstract [en]

Sedimentary rocks examined by the Curiosity rover at Yellowknife Bay, Mars, were derived from sources that evolved from an approximately average martian crustal composition to one influenced by alkaline basalts. No evidence of chemical weathering is preserved, indicating arid, possibly cold, paleoclimates and rapid erosion and deposition. The absence of predicted geochemical variations indicates that magnetite and phyllosilicates formed by diagenesis under low-temperature, circumneutral pH, rock-dominated aqueous conditions. Analyses of diagenetic features (including concretions, raised ridges, and fractures) at high spatial resolution indicate that they are composed of iron- and halogen-rich components, magnesium-iron-chlorine–rich components, and hydrated calcium sulfates, respectively. Composition of a cross-cutting dike-like feature is consistent with sedimentary intrusion. The geochemistry of these sedimentary rocks provides further evidence for diverse depositional and diagenetic sedimentary environments during the early history of Mars.

Place, publisher, year, edition, pages
2014. Vol. 343, no 6169, article id 1244734
National Category
Aerospace Engineering
Research subject
Atmospheric science
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URN: urn:nbn:se:ltu:diva-2545DOI: 10.1126/science.1244734ISI: 000330039300004PubMedID: 24324274Scopus ID: 2-s2.0-84892917248Local ID: 02b46aa0-09b2-4652-bec5-d51dbf82d4ceOAI: oai:DiVA.org:ltu-2545DiVA, id: diva2:975397
Note

Upprättat; 2014; Bibliografisk uppgift: Javier Martín-Torres ingår i the MSL Science Team.; 20150224 (ninhul)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-05-14Bibliographically approved

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