Biblioteca de la Universidad Complutense de Madrid

New evidence for a magmatic influence on the origin of Valles Marineris, Mars


Dohm, James M. y Williams, Jean-Pierre y Anderson, Robert C. y Ruiz Pérez, Javier y McGuire, Patrick C. y Komatsu, Goro y Davila, Alfonso F. y Ferris, Justin C. y Baker, Victor R. y Boynton, William V. y Fairén, Alberto G. y Hare, Trent M. y Miyamoto, Hirdy y Tanaka, Kennth L. y Wheelock, Shawn J. (2009) New evidence for a magmatic influence on the origin of Valles Marineris, Mars. Journal of volcanology and geothermal research, 185 . pp. 12-27. ISSN 0377-0273

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In this paper, we show that the complex geological evolution of Valles Marineris, Mars, has been highly
influenced by the manifestation of magmatism (e.g., possible plume activity). This is based on a diversity of
evidence, reported here, for the central part, Melas Chasma, and nearby regions, including uplift, loss of huge
volumes of material, flexure, volcanism, and possible hydrothermal and endogenic-induced outflow channel
activity. Observations include: (1) the identification of a new N50 km-diameter caldera/vent-like feature on
the southwest flank of Melas, which is spatially associated with a previously identified center of tectonic
activity using Viking data; (2) a prominent topographic rise at the central part of Valles Marineris, which
includes Melas Chasma, interpreted to mark an uplift, consistent with faults that are radial and concentric
about it; (3) HiRISE-identified landforms along the floor of the southeast part of Melas Chasma that are
interpreted to reveal a volcanic field; (4) CRISM identification of sulfate-rich outcrops, which could be
indicative of hydrothermal deposits; (5) GRS K/Th signature interpreted as water–magma interactions and/
or variations in rock composition; and (6) geophysical evidence that may indicate partial compensation of
the canyon and/or higher density intrusives beneath it. Long-term magma, tectonic, and water interactions
(Late Noachian into the Amazonian), albeit intermittent, point to an elevated life potential, and thus Valles
Marineris is considered a prime target for future life detection missions.

Tipo de documento:Artículo
Palabras clave:Mars, Valles Marineris, Tharsis, Plume, Superplume, Magma, Water, Canyon System, Life
Materias:Ciencias > Geología > Geodinámica
Código ID:10517
Depositado:07 Jul 2010 07:51
Última Modificación:26 Aug 2010 09:09

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