Mineralogical and Oxygen Isotope Study of a Refractory Chondrule Fragment from Comet Wild2

Details Mineralogical and Oxygen Isotope Study of a Refractory Chondrule Fragment from Comet Wild2 Mineralogical and Oxygen Isotope Study of a Refractory Chondrule Fragment from Comet Wild2

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1836b&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1836

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An unexpected result from the Stardust mission to retrieve samples from the coma of the Jupiter Family Comet Wild2 has been the identification of a large proportion of high temperature, crystalline material e.g. 0.5 - 0.65 [1]. An extreme example of this is the identification of refractory material similar to calcium aluminium rich inclusions (CAIs) from carbonaceous chondrites [2, 3]. Study of this material has the potential to inform us about early Solar System thermal processing, whether it originated in the inner or outer Solar System, and the relationship between asteroidal and cometary materials. To fully understand the affinities with other planetary materials, a variety of techniques need to be used. In particular for this purpose, the combination of electron microscopy and oxygen isotope analyses is particularly useful. Transmission Electron Microscopy (TEM) of Stardust samples and Focused Ion Beam preparation of mineral and isotope standards have been performed at the University of Leicester (UoL). NanoSIMS 50L oxygen isotope analyses on the same section have been made at the PSSRI, Open University. We use this combination of techniques to study a terminal grain from Track#154.

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