GRS evidence and the possibility of paleooceans on Mars
| Autor: | Lucia Marinangeli, John Keller, Daniel M. Janes, Roberto Furfaro, Alberto G. Fairén, Gian Gabriele Ori, J. C. Ferris, Trent M. Hare, Dirk Schulze-Makuch, Javier Ruiz, Kris Kerry, Michael Finch, Victor R. Baker, William V. Boynton, Jeffrey S. Kargel, Shawn J. Wheelock, William C. Mahaney, Kyeong Ja Kim, Suniti Karunatillake, James M. Dohm, Goro Komatsu |
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| Přispěvatelé: | Korea Institute of Geoscience and Mineral Resource, Ministry of Science and Technology (South Korea) |
| Rok vydání: | 2009 |
| Předmět: |
Mars Odyssey spacecraft
Geodinámica Evaporite deposits Shorelines Sorting (sediment) Geochemistry Mars Hydrogeology Thorium chemistry.chemical_element Astronomy and Astrophysics Weathering Mars Exploration Program Geophysics Ancient acidic oceans Paleosol Gamma Ray Spectrometer (GRS) Potassium (K) thorium (Th) and iron (Fe) distribution Igneous rock chemistry Space and Planetary Science Clastic rock Deposition (chemistry) Geology |
| Zdroj: | E-Prints Complutense. Archivo Institucional de la UCM instname Digital.CSIC. Repositorio Institucional del CSIC E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid |
| Popis: | 71 manuscript pages, 12 figures, 3 tables.-- Presented at the 2nd International Workshop on Exploring Mars and its Earth Analogues, Trento, Italy, June 19-23, 2007: http://digital.csic.es/handle/10261/8617 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 eathering/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). We are grateful to the Gamma Ray Spectrometer Team whose diligent efforts have yielded tremendous fruit. Kyeong Kim is partially supported by the Basic Research Project (08-3611) of the Korea Institute of Geoscience and Mineral Resources (KIGAM) funded by the Ministry of Science and Technology (MOST) of Korea. |
| Databáze: | OpenAIRE |
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