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| The Sulfur Isotopic Characteristics and Geological Significance of Jinbaoshan Pt-Pd Deposit and Limahe Nickel Deposit |
| MA Yan-sheng1,2, TAO Yan1, ZHU Fei-lin1,2, WANG Xing-zhen3 |
1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, China;
2. Graduate School of the Chinese Academy of Science, Beijing 100049, China;
3. Department of Resource and Environment Engineering, Anhui Institute of Technology, Huainan City, Anhui 232001, China |
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Abstract The Jinbaoshan Pt-Pd deposit and Limahe nickel deposit are two important Ni-Cu-PGE sulfide deposits in the Emeishan Large Igneous Province(ELIP),SW China.The two deposits have very distinctive mineralization characteristics that the Jinbaoshan deposit enriched Pt and Pd but depleted Cu and Ni,and contained low content of disseminated sulfides;while the Limahe deposit depleted PGE and enriched troilite-like or massive sulfide ores.The objective of this study is to explore the large variations of ore-forming elements and texture types of ores by the means of analyzing S isotopic compositions of the sulfide ores.The sulfide ores in Jinbaoshan have a restricted range of δ34S values from +0.6‰ to +2.8‰ slightly higher than the range of 0±2‰,which is considered to be normal for sulfur of mantle derivation.These values indicate that the ore-forming magma experienced a weak contamination of crustal material.Compared with the Jinbaoshan deposit,the Limahe deposit has higher δ34S values from +2.4‰ to +5.4‰ which are significantly higher than the corresponding values of Jinbaoshan deposit.It indicates that the ore-forming magma of Limahe experienced a larger degree of contamination from the crustal material.As a result,the difference degrees of crustal material contamination during the evolution of ore-forming magma may be one important reason for the variations of mineralization types of magmatic Ni-Cu-PGE deposits in the ELIP.
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Received: 04 August 2008
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