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Boom boom pow: Shock-facilitated aqueous alteration and evidence for two shock events in the Martian nakhlite meteorites
Univ Glasgow, Sch Geog & Earth Sci, Glasgow G12 8QQ, Lanark, Scotland;Curtin Univ, Sch Earth & Planetary Sci, Space Sci & Technol Ctr, GPO Box U1987, Perth, WA 6845, Australia;Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia.
Univ Glasgow, Sch Geog & Earth Sci, Glasgow G12 8QQ, Lanark, Scotland.
Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England.
Univ Glasgow, Sch Geog & Earth Sci, Glasgow G12 8QQ, Lanark, Scotland.
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2019 (English)In: Science Advances, E-ISSN 2375-2548, Vol. 5, no 9, article id eaaw5549Article in journal (Refereed) Published
Abstract [en]

Nakhlite meteorites are similar to 1.4 to 1.3 Ga old igneous rocks, aqueously altered on Mars similar to 630 Ma ago. We test the theory that water-rock interaction was impact driven. Electron backscatter diffraction demonstrates that the meteorites Miller Range 03346 and Lafayette were heterogeneously deformed, leading to localized regions of brecciation, plastic deformation, and mechanical twinning of augite. Numerical modeling shows that the pattern of deformation is consistent with shock-generated compressive and tensile stresses. Mesostasis within shocked areas was aqueously altered to phyllosilicates, carbonates, and oxides, suggesting a genetic link between the two processes. We propose that an impact similar to 630 Ma ago simultaneously deformed the nakhlite parent rocks and generated liquid water by melting of permafrost. Ensuing water-rock interaction focused on shocked mesostasis with a high density of reactive sites. The nakhlite source location must have two spatially correlated craters, one similar to 630 Ma old and another, ejecting the meteorites, similar to 11 Ma ago.

Place, publisher, year, edition, pages
2019. Vol. 5, no 9, article id eaaw5549
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Geophysics Geology
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URN: urn:nbn:se:uu:diva-396671DOI: 10.1126/sciadv.aaw5549ISI: 000491128800023PubMedID: 31517047OAI: oai:DiVA.org:uu-396671DiVA, id: diva2:1368593
Available from: 2019-11-07 Created: 2019-11-07 Last updated: 2019-11-07Bibliographically approved

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