Oxygen isotope studies of carbonaceous chondrites |
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| Institution: | 1. Enrico Fermi Institute, Department of Chemistry, Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, USA;2. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA;1. Department of Earth and Planetary Sciences, University of California-Davis, One Shields Avenue, Davis, CA 95616, USA;2. Research School of Earth Sciences, The Australian National University, Canberra, ACT 2601, Australia;3. Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, USA;1. IMPMC, MNHN, UPMC, UMR CNRS 7590, 61 rue Buffon, 75005 Paris, France;2. CRPG, CNRS, Université de Lorraine, UMR 7358, Vandoeuvre les Nancy, F-54501, France;3. Institut Universitaire de France, Maison des Universités, 103 bd. Saint-Michel, 75005 Paris, France;1. Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, 10th & Constitution NW, Washington, DC 20560-0119, USA;2. Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road NW, Washington, DC 20015-1305, USA;3. Planetary and Space Sciences, Department of Physical Sciences, Open University, Milton Keynes MK7 6AA, UK;1. CNRS, CRPG UMR 7358, Vandoeuvre-lès-Nancy, F-54501, France;2. Université de Lorraine, CRPG UMR 7358, Vandoeuvre-lès-Nancy, F-54501, France;3. Institut de Physique du Globe de Paris (IPGP), CNRS UMR 7154, Paris, F-75238, France |
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| Abstract: | The carbonaceous chondrites display the widest range of oxygen isotopic composition of any meteorite group, as a consequence of the interaction of primordial isotopic reservoirs in the solar nebula. These isotopic variations can be used to identify the reservoirs and to determine conditions and loci of their interactions. We present a comprehensive set of whole-rock analyses of CV, CO, CK, CM, CR, CH, and CI chondrites, as well as selected components of some of these meteorites. A simple model is developed which describes the isotopic behavior during parent-body aqueous alteration processes. The process of thermal dehydration also produces a recognizable effect in the oxygen isotopic composition. |
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