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Amazonian volcanism inside Valles Marineris on Mars
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SYSNO ASEP 0475545 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Amazonian volcanism inside Valles Marineris on Mars Tvůrce(i) Brož, Petr (GFU-E) ORCID, RID
Hauber, E. (DE)
Wray, J. J. (US)
Michael, G. (DE)Zdroj.dok. Earth and Planetary Science Letters. - : Elsevier - ISSN 0012-821X
Roč. 473, September (2017), s. 122-130Poč.str. 9 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Mars ; Valles Marineris ; volcanism ; scoria cone ; hydrothermal activity Vědní obor RIV DC - Seismologie, vulkanologie a struktura Země Obor OECD Volcanology Institucionální podpora GFU-E - RVO:67985530 UT WOS 000406571500013 EID SCOPUS 85033580402 DOI 10.1016/j.epsl.2017.06.003 Anotace 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. Pracoviště Geofyzikální ústav Kontakt Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Rok sběru 2018
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