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GRS evidence and the possibility of paleooceans on Mars

Dohm, James M. and Baker, Victor R. and Boynton, William V. and Fairén, Alberto G. and Ferris, Justin C. and Finch, Michael and Furfaro, Roberto and Hare, Trent M. and Janes, Daniel M. and Kargel, Jeffrey S. and Karunatillake, Suniti and Keller, John and Kerry, Kris and Kim, Kyeong J. and Komatsu, Goro and Mahaney, William C. and Schulze-Makuchm, Dirk and Marinangeli, Lucia and Ori, Gian G. and Ruiz Pérez, Javier and Wheelock, Shawn J. (2009) GRS evidence and the possibility of paleooceans on Mars. Planetary and space science, 57 . pp. 664-684. ISSN 0032-0633

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Abstract

The Gamma Ray Spectrometer (Mars Odyssey spacecraft) has revealed elemental distributions of
potassium (K), thorium(Th), and iron (Fe) on Mars that require fractionation of K (and possibly Th and
Fe) consistent with aqueous activity. This includes weathering, evolution of soils, and transport, sorting,
and deposition, as well as with the location of first-order geomorphological demarcations identified as
possible paleoocean boundaries. The element abundances occur in patterns consistent with weathering
in situ and possible presence of relictor exhumed paleosols, deposition of weathered materials (salts
and clastic minerals), and weathering/transport under neutral to acidic brines. The abundances are
explained by hydrogeology consistent with the possibly over lapping alternatives of paleooceans and/or
heterogeneous rock compositions from diverse provenances (e.g., differing igneous compositions).

Item Type:Article
Uncontrolled Keywords:Mars, Gamma-ray spectrometer, Oceans, Water, Elemental, Hidrogeology
Subjects:Sciences > Geology > Geodynamics
ID Code:10512
Deposited On:10 Jun 2010 09:37
Last Modified:31 Dec 2011 23:05

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