Geochemical characteristics of the platinum-group elements in the Abulangdang ultramafic intrusion,Sichuan Province,China |
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| Authors: | Yansheng Ma Yan Tao Hong Zhong Feilin Zhu Jiaxi Zhou |
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| Institution: | (1) State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China;(2) Graduate School of the Chinese Academy of Science, Beijing, 100049, China |
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| Abstract: | The contents of the platinum-group elements (PGEs: Os, Ir, Ru, Rh, Pt, Pd) in the Abulangdang ultramafic intrusion have been
determined using ICP-MS after nickel sulfide fire assay preconcentration. Different samples show significant differences in
absolute PGE abundance. They display a pronounced negative incline in mantle-normalized patterns which are characterized by
strong enrichment in IPGEs (Os, Ir, Ru) and depleting to slight enrichment in PPGEs (Rh, Pt, Pd). The characteristics of PGE
distribution in the Abulangdang rocks are due to the combined action of sulfide and non-sulfide (spinel/chromite or alloy
or micro-granular aggregation of metals). In comparison with the mafic-ultramafic rocks which host Ni-Cu-PGE deposits in the
Emeishan Large Igneous Province (ELIP), it is assumed that the Abulangdang ultramafic intrusion may be the product of early-stage
magma activity in the ELIP. |
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| Keywords: | platinum-group elements (PGEs) sulfide ultramafic rock ELIP |
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