Enstatite chondrites and enstatite achondrites (aubrites) were not derived from the same parent body |
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| Affiliation: | 1. U.S. Geological Survey, 959, Reston, VA 22092 USA;2. Department of Geology, Institute of Meteoritics, University of New Mexico, Albuquerque, NM 87131 USA;1. Department of Earth and Planetary Sciences and McDonnell Center for the Space Sciences, Washington University in St Louis, One Brookings Drive, St. Louis, MO 63130, USA;2. Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA 02138, USA;3. Department of Earth Sciences, Durham University, Science Labs, Durham DH1 3LE, United Kingdom;4. Institut de Physique du Globe de Paris, Institut Universitaire de France, Université Paris Diderot, Sorbonne Paris Cité, 1 rue Jussieu, 75238 Paris Cedex 05, France;1. Institut für Mineralogie, Leibniz Universität Hannover, 30167 Hannover, Germany;2. Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, Cambridge, MA 02139, USA;3. Department of Geology, University of Liège, 4000 Sart Tilman, Belgium;4. Bayerisches Geoinstitut, University of Bayreuth, 95440 Bayreuth, Germany;1. Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, The Netherlands;2. Centre for Planetary Sciences, Birkbeck – UCL, London, UK;3. Department of Earth Sciences, Mineral and Planetary Sciences Division, Natural History Museum, London, UK;1. Institute for Geochemistry and Petrology, ETH Zürich, Clausiusstrasse 25, 8092 Zurich, Switzerland;2. Institut für Planetologie, Westfälische Wilhelms-Universität Münster, Wilhelm Klemm-Str. 10, 48149 Münster, Germany;3. Department of Earth and Environmental Sciences, 2534 C.C. Little Building, 1100 N. University, Ann Arbor, MI 48109, USA;4. Laboratoire de Géologie des Lyon, Ecole Normale Supérieure de Lyon, CNRS and UCBL, 46, Allée d’Italie, 69364 Lyon cedex 7, France;1. Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC) Sorbonne Universités - UPMC Univ Paris 06, UMR CNRS 7590, Museum National d''Histoire Naturelle, IRD, 4 Place Jussieu, F-75005 Paris, France;2. Institut de Physique du Globe de Paris, Sorbonne Paris Cité - Université Paris Diderot, UMR CNRS 7154, F-75005 Paris, France;1. Dept. of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, DC, 20560-0119, USA;2. Science Matters Consulting, LLC, Washington, DC, 20016, USA;3. School of Earth and Planetary Sciences, Curtin University, Bentley, WA, 6102, Australia;4. Center for Meteorite Studies, School of Earth and Space Exploration, Arizona State University, Tempe, AZ, 85287-1404, USA |
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| Abstract: | Enstatite achondrites (aubrites) were not derived from known enstatite chondrites by melting and fractionation on one and the same parent body, for these and other reasons: (1) There is no satisfactory mechanism for fractionating metal plus troilite in enstatite chondrites to form these phases in different proportions and with different Ti contents in aubrites. (2) Many enstatite chondrites and aubrites are regolith or fragmental breccias, but clasts of one within the other have not been found. (3) Cosmic ray exposure ages of the two groups are difficult to explain if they are from the same parent body, but are easy to explain if they are from different parent bodies.Siderophile element abundances in metal from the Mt. Egerton meteorite, which consists of enstatite and metallic Fe,Ni, preclude it from being a complementary differentiate of the aubrites. Rather, it appears that Mt. Egerton was formed from the same source material as enstatite chondrites, but the components were mixed in different proportions. |
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