[meteorite-list] Mesosiderites= Vestan?

[Darren Garrison]

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 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.