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GRS evidence and the possibility of paleooceans on Mars

January 1, 2009

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 relict or 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 overlapping alternatives of paleooceans and/or heterogeneous rock compositions from diverse provenances (e.g., differing igneous compositions). ?? 2008 Elsevier Ltd.

Publication Year 2009
Title GRS evidence and the possibility of paleooceans on Mars
DOI 10.1016/j.pss.2008.10.008
Authors J. M. Dohm, V.R. Baker, W. V. Boynton, A.G. Fairen, J.C. Ferris, M. Finch, R. Furfaro, T.M. Hare, D.M. Janes, J.S. Kargel, S. Karunatillake, J. Keller, K. Kerry, K.J. Kim, G. Komatsu, W.C. Mahaney, D. Schulze-Makuch, L. Marinangeli, G.G. Ori, J. Ruiz, S.J. Wheelock
Publication Type Article
Publication Subtype Journal Article
Series Title Planetary and Space Science
Index ID 70034750
Record Source USGS Publications Warehouse
USGS Organization California Water Science Center