Re-Os (ICP-MS) dating of the massive sulfide ores from the Jinchuan Ni-Cu-PGE deposit
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%.
作 者： YANG Gang DU Andao LU Jiren QU Wenjun CHEN Jiangfeng 作者单位： YANG Gang(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)DU Andao,QU Wenjun(National Research Center of Geoanalysis, Beijing 100037, China)
LU Jiren(Institute of Mineral Resource, Chinese Academy of Geological Sciences, Beijing 100037, China)
CHEN Jiangfeng(Laboratory for Earth Material Cycling, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China)
刊 名： 中国科学D辑（英文版） SCI 英文刊名： SCIENCE IN CHINA SERIES D (EARTH SCIENCES) 年，卷(期)： 2005 48(10) 分类号： P3 关键词： Jinchuan Ni-Cu-PGE deposit Re-Os dating ICP-MS