In situ radiometric and exposure age dating of the martian surface

Autor: Farley, K.A., Malespin, C., Mahaffy, P., Grotzinger, J.P., Vasconcelos, P.M., Milliken, R.E., Malin, M., Edgett, K.S., Pavlov, A.A., Hurowitz, J.A., Grant, J.A., Miller, H.B., Arvidson, R., Beegle, L., Calef, F., Conrad, P.G., Dietrich, W.E., Eigenbrode, J., Gellert, R., Gupta, S., Hamilton, V., Hassler, D.M., Lewis, K.W., McLennan, S.M., Ming, D., Navarro-González, R., Schwenzer, S.P., Steele, A., Stolper, E.M., Sumner, D.Y., Vaniman, D., Vasavada, A., Williford, K., Wimmer-Schweingruber, R.F., MSL Science Team, the, NWO-NSO: The role of perchlorates in the preservation of organic compounds on Mars, Petrology
Přispěvatelé: NWO-NSO: The role of perchlorates in the preservation of organic compounds on Mars, Petrology, California Institute of Technology (CALTECH), NASA Goddard Space Flight Center (GSFC), University of Queensland [Brisbane], Department of Geological Sciences [Providence], Brown University, Department of Geosciences [Stony Brook], Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY), Center for Earth and Planetary Studies [Washington] (CEPS), Smithsonian National Air and Space Museum, Smithsonian Institution-Smithsonian Institution, Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Department of Earth and Planetary Science [UC Berkeley] (EPS), University of California [Berkeley], University of California-University of California, Department of Physics [Guelph], University of Guelph, Department of Earth Science and Technology [Imperial College London], Imperial College London, Southwest Research Institute [Boulder] (SwRI), Princeton University, NASA Johnson Space Center (JSC), NASA, Instituto de Ciencias Nucleares [Mexico], Universidad Nacional Autónoma de México (UNAM), Dept. of Physical Sciences, The Open University [Milton Keynes] (OU), Geophysical Laboratory [Carnegie Institution], Carnegie Institution for Science [Washington], Planetary Science Institute [Tucson] (PSI), Kiel University, GeoRessources, Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Institut national des sciences de l'Univers (INSU - CNRS)
Rok vydání: 2013
Předmět:
Zdroj: Science, 343(6169), 1. American Association for the Advancement of Science
Science
Science, American Association for the Advancement of Science, 2014, 343 (6169), ⟨10.1126/science.1247166⟩
ISSN: 0036-8075
1095-9203
Popis: We determined radiogenic and cosmogenic noble gases in a mudstone on the floor of Gale Crater. A K-Ar age of 4.21 ± 0.35 billion years represents a mixture of detrital and authigenic components and confirms the expected antiquity of rocks comprising the crater rim. Cosmic-ray–produced 3 He, 21 Ne, and 36 Ar yield concordant surface exposure ages of 78 ± 30 million years. Surface exposure occurred mainly in the present geomorphic setting rather than during primary erosion and transport. Our observations are consistent with mudstone deposition shortly after the Gale impact or possibly in a later event of rapid erosion and deposition. The mudstone remained buried until recent exposure by wind-driven scarp retreat. Sedimentary rocks exposed by this mechanism may thus offer the best potential for organic biomarker preservation against destruction by cosmic radiation.
Databáze: OpenAIRE
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