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Amazonian volcanism inside Valles Marineris on Mars
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SYSNO ASEP 0475545 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Amazonian volcanism inside Valles Marineris on Mars Author(s) Brož, Petr (GFU-E) ORCID, RID
Hauber, E. (DE)
Wray, J. J. (US)
Michael, G. (DE)Source Title Earth and Planetary Science Letters. - : Elsevier - ISSN 0012-821X
Roč. 473, September (2017), s. 122-130Number of pages 9 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords Mars ; Valles Marineris ; volcanism ; scoria cone ; hydrothermal activity Subject RIV DC - Siesmology, Volcanology, Earth Structure OECD category Volcanology Institutional support GFU-E - RVO:67985530 UT WOS 000406571500013 EID SCOPUS 85033580402 DOI 10.1016/j.epsl.2017.06.003 Annotation The giant trough system of Valles Marineris is one of the most spectacular landforms on Mars, yet its origin is still unclear. Although often referred to as a rift, it also shows some characteristics that are indicative of collapse processes. For decades, one of the major open questions was whether volcanism was active inside the Valles Marineris. Here we present evidence for a volcanic field on the floor of the deepest trough of Valles Marineris, Coprates Chasma. More than 130 individual edifices resemble scoria and tuff cones, and are associated with units that are interpreted as lava flows. Crater counts indicate that the volcanic field was emplaced sometime between similar to 0.4 Ga and similar to 0.2 Ga. The spatial distribution of the cones displays a control by trough-parallel subsurface structures, suggesting magma ascent in feeder dikes along trough-bounding normal faults. Spectral data reveal an opaline-silica-rich unit associated with at least one of the cones, indicative of hydrothermal processes. Our results point to magma-water interaction, an environment of astrobiological interest, perhaps associated with late-stage activity in the evolution of Valles Marineris, and suggest that the floor of Coprates Chasma is promising target for the in situ exploration of Mars. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2018
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