Open Research Online The Open University’s repository of research publications and other research outputs Trace element distributions in the main group pallasites Conference or Workshop Item How to cite: Johnson, Diane; Rogers, Nick and Grady, Monica (2010). Trace element distributions in the main group pallasites. In: 73rd Annual Meeting of the Meteoritical Society, 26-30 Jul 2010, New York City, USA. For guidance on citations see FAQs. c 2010 The Authors Version: Version of Record Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online’s data policy on reuse of materials please consult the policies page. oro.open.ac.uk TRACE ELEMENT DISTRIBUTIONS IN THE MAIN GROUP PALLASITES D. Johnson1, N.W.Rogers2, M.M. Grady1,3 1PSSRI, Open University, Walton Hall, Milton Keynes, MK7 6AA,UK; E-mail:
[email protected]. 2 Department of Earth and Environmental Sciences, Open University, Walton Hall, Milton Keynes, MK76AA, UK. 3Department of Mineralogy, The Natural History Museum, London, SW7 5BD, UK. Introduction: The origins and evolution of Pallasites have been greatly debated. Proposed Results and Discussion: Hambleton analysis of multiple Kamacite grains shows inter- formation models include core-mantle boundary regions, crystallised impact materials(1), dendritic grain variation trends as shown in Figures 5-7. This can be explained by mixing of the residual melt core growth(2), crystallised material close to the surface of an asteroid subject to external with pre-existing metal crystals this would have taken place at the same time as the olivine metal heating(3).