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- K. A. Farley
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
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- C. Malespin
- NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
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- P. Mahaffy
- NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
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- J. P. Grotzinger
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
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- P. M. Vasconcelos
- School of Earth Sciences, University of Queensland, Brisbane, Queensland QLD 4072, Australia.
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- R. E. Milliken
- Department of Geological Sciences, Brown University, Providence, RI 02912, USA.
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- M. Malin
- Malin Space Science Systems, San Diego, CA 92121, USA.
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- K. S. Edgett
- Malin Space Science Systems, San Diego, CA 92121, USA.
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- A. A. Pavlov
- NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
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- J. A. Hurowitz
- Department of Geosciences, Stony Brook University, Stony Brook, NY 11794, USA.
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- J. A. Grant
- Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, 6th at Independence SW, Washington, DC 20560, USA.
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- H. B. Miller
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
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- R. Arvidson
- Department of Earth and Planetary Sciences, Washington University in St. Louis, St. Louis, MO 63130, USA.
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- L. Beegle
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
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- F. Calef
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
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- P. G. Conrad
- NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
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- W. E. Dietrich
- Earth and Planetary Science Department, University of California, Berkeley, CA 94720, USA.
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- J. Eigenbrode
- NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
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- R. Gellert
- Department of Physics, University of Guelph, Guelph, ON N1G 2W1, Canada.
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- S. Gupta
- Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK.
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- V. Hamilton
- Southwest Research Institute, Boulder, CO 80302, USA.
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- D. M. Hassler
- Southwest Research Institute, Boulder, CO 80302, USA.
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- K.W. Lewis
- Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.
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- S. M. McLennan
- Department of Geosciences, Stony Brook University, Stony Brook, NY 11794, USA.
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- D. Ming
- NASA Johnson Space Center, Houston, TX 77058, USA.
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- R. Navarro-González
- Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de Mexico, Ciudad Universitaria, México D.F. 04510, Mexico.
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- S. P. Schwenzer
- Department of Physical Sciences, CEPSAR, Walton Hall, Milton Keynes MK7 6AA, UK.
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- A. Steele
- Carnegie Institution, Geophysical Laboratory, Washington, DC 20015, USA.
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- E. M. Stolper
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
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- D. Y. Sumner
- Department of Geology, University of California, Davis, CA 95616, USA.
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- D. Vaniman
- Planetary Science Institute, Tucson, AZ 85719, USA.
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- A. Vasavada
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
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- K. Williford
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
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- R. F. Wimmer-Schweingruber
- University of Kiel, Kiel D-24098, Germany.
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説明
<jats:p> 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 <jats:sup>3</jats:sup> He, <jats:sup>21</jats:sup> Ne, and <jats:sup>36</jats:sup> 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. </jats:p>
収録刊行物
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- Science
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Science 343 (6169), 1247166-, 2014-01-24
American Association for the Advancement of Science (AAAS)
