Platinum-group elements for the mantle peridotites in the Dazhuka ophiolite, Tibet, China |
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Authors: | Hengxiang Yu Bin Xia Houjun Mei Linzhi Guo Liang Qi Xianglin Tu |
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Affiliation: | (1)Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 ,China; (2)Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 ,China; (3)Department of Earth Sciences, Nanjing University, Nanjing 210092 ,China |
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Abstract: | The total PGE amounts of mantle peridotites in the Dazhuka ophiolite, Tibet, are 28.37—50.67 ng/g, slightly higher than those of mantle peridotites in the primitive mantle, and typical ophiolites in the world, and the Alps-type mantle peridotites. The PGE distribution patterns in the Dazhuka mantle peridotites are also different from those of the mantle peridotites of partial melting relict origin. The Dazhuka mantle peridotites have relatively high total PGE amounts and are enriched in Pt, Pd, and Ru. Their PGE distribution patterns belong to the positively inclined- or swallow-type patterns. The PGE distribution patterns in the mantle peridotites of partial melting relict origin belong to the negative-slope patterns or flat patterns. This reflects the unique features of the upper mantle in this region. Relative enrichment in Pt and Pd, as well as in the incompatible elements Cu, Au, Cs, Rb, Ba, Th, U and LREE, indicates that the partial melting-derived relict mantle peridotites in the Dazhuka ophiolite had experienced intensive permeating and mixing processes of the melt and fluid both containing abundant incompatible elements. |
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Keywords: | platinum-group elements mantle peridotites Dazhuka ophiolite Tibet |
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