| 江西九瑞地区东雷湾矽卡岩型铜多金属矿床锆石U-Pb和辉钼矿Re-Os年龄及其地质意义 |
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| 关键词:metallogenetic setting zircon U-Pb age molybdenite Re-Os age skarn copper-polymetallic deposit Dongleiwan mining area Jiujiang–Ruichang ore concentration area |
| 基金项目:国家十二五科技支撑计划课题(编号: 2009BAB43B03; 2011BAB04B03);国家专项“深部探测技术与实验研究”(编号: SinoProbe-03-06);国土资源部公益性行业科研专项(编号: 201311166(SinoProbe-03-07)) |
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| Zircon U-Pb and Molybdenite Re-Os Dating of the Dongleiwan Skarn Cu Polymetallic Deposit in the Jiujiang–Ruichang Ore Concentration Area of Jiangxi Province and Its Geological Significance |
| The Dongleiwan skarn Cu-Mo-Au polymetallic deposit is located in northwestern Jiujiang–Ruichang ore concentration area. U-Pb LA-MC-ICP MS dating of zircons from Dongleiwan granodiorite porphyry yielded an age of (142.24±0.52) Ma. Six molybdenite samples separated from quartz sulfides in Dongleiwan skarn orebodies were used for Re-Os dating and the model ages obtained range from (144.8±3.1) Ma to (147.1±2.4) Ma, with weighted average (146.12±0.97) Ma and isochron age (143.3±5.2) Ma. These ages suggest that the mineralization in the Dongleiwan skarn copper-polymetallic deposit was genetically associated with the granodiorite porphyry, and the rock-forming and ore-forming processes were quite consistent with each other. The Re content of molybdenite indicates that the ore-forming materials were derived from the mantle and the crust. These data show that ages of rock body and ore body in the Dongleiwan deposit are almost identical with ages of other typical rock masses and deposits in the Jiujiang–Ruichang ore concentration area, and even quite close to ages of typical Cu-polymetallic deposits in such areas as Tongling, Anqing and part of southeast Hubei along the Middle–Lower Yangtze River metallogenic belt. Based on regional tectonic evolution, it is inferred that the Dongleiwan deposit was formed in the transition period from EW-striking Indosinian tectonic domain to NE-striking Paleo-Pacific tectonic domain. |
| JIA Li-qiong,YANG Dan,XU Wen-yi,LÜ Qing-tian,YANG Zhu-sen,MO Xuan-xue,WANG Liang.2015.Zircon U-Pb and Molybdenite Re-Os Dating of the Dongleiwan Skarn Cu Polymetallic Deposit in the Jiujiang–Ruichang Ore Concentration Area of Jiangxi Province and Its Geological Significance[J].Acta Geoscientica Sinica,36(2):177-186. |
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