http://www.sciencemag.org/cgi/content/abstract/313/5794/1763
Originally published in Science Express on 24 August 2006 Science 22 September 2006: Vol. 313. no. 5794, pp. 1763 - 1765 DOI: 10.1126/science.1128865 Reports Oxygen Isotope Variation in Stony-Iron Meteorites R. C. Greenwood,1* I. A. Franchi,1 A. Jambon,2 J. A. Barrat,3 T. H. Burbine4 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. 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 OccidentaleUniversitaire 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. ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
