Oxygen Isotope Variation in Stony-Iron Meteorites

Author:

Greenwood R. C.1234,Franchi I. A.1234,Jambon A.1234,Barrat J. A.1234,Burbine T. H.1234

Affiliation:

1. 1Planetary and Space Sciences Research Institute, Open University, Walton Hall, Milton Keynes, MK7 6AA UK.

2. Laboratoire Magmatologie et Géochimie Inorganique et Expérimentale, Université Pierre et Marie Curie, CNRS UMR 7047 case 110, 4 place Jussieu, 75252 Paris Cedex 05, France.

3. Université de Bretagne Occidentale–Universitaire Européen de la Mer, CNRS UMR 6538 (Domaines Océaniques), place Nicolas Copernic, F-29280 Plouzané Cedex, France.

4. Department of Astronomy, Mount Holyoke College, South Hadley, MA 01075, USA.

Abstract

Asteroidal material, delivered to Earth as meteorites, preserves a record of the earliest stages of planetary formation. High-precision oxygen isotope analyses for the two major groups of stony-iron meteorites (main-group pallasites and mesosiderites) demonstrate that each group is from a distinct asteroidal source. Mesosiderites are isotopically identical to the howardite-eucrite-diogenite clan and, like them, are probably derived from the asteroid 4 Vesta. Main-group pallasites represent intermixed core-mantle material from a single disrupted asteroid and have no known equivalents among the basaltic meteorites. The stony-iron meteorites demonstrate that intense asteroidal deformation accompanied planetary accretion in the early Solar System.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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