Fractionation of platinum group elements in upper mantle: Evidence from peridotite xenoliths from Wangqing |
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| Authors: | Yigang Xu B Orberger S J Reeves |
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| Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Wushan, China;(2) Laboratoire de Geochronologie, Universite, F-75251 Paris 7, Paris, France;(3) School of Earth Sciences, University of Melbourne, 3052 Parkville, Victoria, Australia |
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| Abstract: | The peridotite xenoliths from Wangqing display a downward-concave PGE pattern with Pt at maximum due to Pt-Pd fractionation,
which is different from the flat or negatively sloped patterns commonly observed for worldwide peridotite xenoliths and massifs.
Taking into account the difference in partition coefficients of Pt and Pd between alloy and sulfide melt, it is suggested
that some of the Wangqing peridotites must have been equilibrated with a melt in which alloy and sulfide coexisted. Segregation
of Pt-rich alloy from Pd-sulfide melts due to density contrast and extraction of residual melts without sulfide saturation
resulted in the fractionation of Pt from Pd.
Project supported by the Ministry of Human Affairs and a part of an international collaboration program between the Chinese
Academy of Sciences and Centre National de Recherche Scientifique (CNRS, France), and Australian Institute of Nuclear Sciences
and Engineering (AINSE) grant to SJR. |
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| Keywords: | PGE geochemistry peridotite xenolith upper mantle Wangqing Jilin |
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