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Meteoritics & Planetary Science 44 (2009) 1643-1661
Connection between micrometeorites and Wild 2 particles: From Antarctic snow to cometary ices
E. Dobrica1, C. Engrand1, J. Duprat1, M. Gounelle2, H. Leroux3, E. Quirico4, J.-N. Rouzaud5

We discuss the relationship between large cosmic dust that represents the main source of extraterrestrial matter presently accreted by the Earth and samples from comet 81P/Wild 2 returned by the Stardust mission in January 2006. Prior examinations of the Stardust samples have shown that Wild 2 cometary dust particles contain a large diversity of components, formed at various heliocentric distances. These analyses suggest large-scale radial mixing mechanism(s) in the early solar nebula and the existence of a continuum between primitive asteroidal and cometary matter. The recent collection of CONCORDIA Antarctic micrometeorites recovered from ultra-clean snow close to Dome C provides the most unbiased collection of large cosmic dust available for analyses in the laboratory. Many similarities can be found between Antarctic micrometeorites and Wild 2 samples, in terms of chemical, mineralogical, and isotopic compositions, and in the structure and composition of their carbonaceous matter. Cosmic dust in the form of CONCORDIA Antarctic micrometeorites and primitive IDPs are preferred samples to study the asteroid-comet continuum.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 :  LMMNHN - Laboratoire de minéralogie du Muséum National d'Histoire Naturelle
3 :  LSPES - Laboratoire de structures et propriétés de l'état solide
4 :  LPG - Laboratoire de Planétologie de Grenoble
5 :  LGE - Laboratoire de géologie de l'ENS
Physique/Astrophysique/Planétologie et astrophysique de la terre

Planète et Univers/Astrophysique/Planétologie et astrophysique de la terre
Micrometeorite(s) – cometary Dust – Cosmic dust – Interplanetary dust particles (IDPs)