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| Re-Os (ICP-MS) dating of the massive sulfide ores from the Jinchuan Ni-Cu-PGE deposit | |
| 作者姓名： | YANG Gang DU Andao LU Jiren QU Wenjun & CHEN Jiangfeng . National Research Center of Geoanalysis Beijing China . Laboratory for Earth Material Cycling School of Earth and Space Sciences University of Science and Technology of China Hefei China . Institute of Mineral Resource Chinese Academy of Geological Sciences Beijing China |
| 作者单位： | YANG Gang1，2，DU Andao1，LU Jiren3，QU Wenjun1 & CHEN Jiangfeng2 1. National Research Center of Geoanalysis，Beijing 100037，China; 2. Laboratory for Earth Material Cycling，School of Earth and Space Sciences，University of Science and Technology of China，Hefei 230026，China; 3. Institute of Mineral Resource，Chinese Academy of Geological Sciences，Beijing 100037，China |
| 摘 要： | The Jinchuan Ni-Cu-PGE deposit is the largest nickel sulfide deposit in China and the third largest in the world1]. It is also the largest platinum deposit in China and contains about 60% platinum reserve of China2]. The Jinchuan intrusion covers only an area of 1.34 km2, but 47.8% of its volume is the orebody. That makes Jinchuan a typical “large ore deposit in a small intrusion”. A number of research works has been car-ried out towards the Jinchuan deposit. Different ore-forming mo… |
Re-Os (ICP-MS) dating of the massive sulfide ores from the Jinchuan Ni-Cu-PGE deposit |
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| YANG Gang,,DU Andao,LU Jiren,QU Wenjun & CHEN Jiangfeng . National Research Center of Geoanalysis,Beijing ,China, . Laboratory for Earth Material Cycling,School of Earth and Space Sciences,University of Science and Technology of China,Hefei ,China, . Institute of Mineral Resource,Chinese Academy of Geological Sciences,Beijing ,China.Re-Os (ICP-MS) dating of the massive sulfide ores from the Jinchuan Ni-Cu-PGE deposit[J].Science in China(Earth Sciences),2005,48(10). | |
| Authors: | YANG Gang DU Andao LU Jiren QU Wenjun CHEN Jiangfeng |
| Institution: | 1. National Research Center of Geoanalysis, Beijing 100037, China;Laboratory for Earth Material Cycling, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China 2. National Research Center of Geoanalysis, Beijing 100037, China 3. Institute of Mineral Resource, Chinese Academy of Geological Sciences, Beijing 100037, China 4. Laboratory for Earth Material Cycling, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China |
| Abstract: | Massive sulfide ore from the Jinchuan Ni-Cu-PGE deposit was dated by Re-Os technique using Carius Tube digestion, Os distillation, Re extraction by acetone and ICP-MS measurement. An isochron giving an age of 833 ± 35 Ma, initial 187Os/188Os ratio of 0.279 ± 0.018 (MSWD = 1.7) and γOs = 130 ± 15 is obtained. The Re-Os age obtained agrees, within analytical uncertainties, with previous SHRIMP zircon U-Pb age of 827 ± 8 Ma (n=5, MSWD = 4.3). The result suggests that the deposit was formed at Neoproterozoic and that the formation of the Jinchuan Ni-Cu-PGE sulfide deposit may be closely related to the plume activity, which were attributed to the breakup of the Rodinia supercontinent. The high γOs of the massive ores suggests that crustal material was involved in the formation of the Jinchuan deposit, however, the quantity of the added crustal material is less than 10%. |
| Keywords: | Jinchuan Ni-Cu-PGE deposit Re-Os dating ICP-MS |
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