| 新疆伊吾琼河坝地区铜、金矿成矿时代及其找矿前景 |
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| 引用本文：WANG DengHong,LI HuaQin,YING LiJuan,MEI YuPing,CHU ZhenLi.2009.Copper and gold metallogenic epoch and prospecting potential in Qiongheba area of Yiwu County, Xinjiang[J].Mineral Deposits,28(1):73~82 |
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| 基金项目:国家305项目“新疆成矿体系研究与资源潜力评估”（编号：2006BAB07B08_01）、“我国重要矿产和区域成矿规律研究”项目（编号：1212010633903）、中国地质大调查 |
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| 中文摘要:文章采用高分辨率、高灵敏度离子探针（SHRIMP）和Rb_Sr等时线定年技术，对新疆伊吾琼河坝地区的云英山斑岩铜矿和淖毛湖北山金矿床的岩体和矿体进行了年代学研究，获得云英山斑岩铜矿区内斜长花岗斑岩体SHRIMP锆石U_Pb年龄为（4117±71）Ma（95%置信度，MSWD=3.0），该矿床的含矿石英脉石英矿物Rb_Sr等时线年龄为（357±15）Ma（95%置信度，MSWD=0.16）；淖毛湖北山金矿含矿石英脉中石英矿物Rb_Sr等时线年龄为（346±10）Ma（95%置信度，MSWD=0.19）。测定结果显示，该区斑岩型铜矿和破碎带蚀变岩型金矿的形成时间为晚泥盆世—早石炭世，表明云英山式斑岩型铜金矿和淖毛湖式金矿成矿作用与泥盆纪—石炭纪汇聚阶段的火山_次火山岩浆活动有关，也意味着在琼河坝地区具有寻找与火山作用有关的铜、金多金属矿的潜力。 |
| 中文关键词:地球化学 年龄测定 铜金矿床 伊吾琼河坝 新疆 |
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| Copper and gold metallogenic epoch and prospecting potential in Qiongheba area of Yiwu County, Xinjiang |
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| Abstract:Chronological studies of rock bodies and ore bodies in the Yunyingshan porphyry copper deposit and the Beishan gold deposit of Naomaohu district in Qiongheba ar ea, Yiwu of Xinjiang, were performed by SHRIMP and Rb_Sr dating in this paper. T he dating data obtained show that the SHRIMP U_Pb age of zircon from plagio_gran ite porphyry in the Yunyingshan porphyry copper deposit is (412±7) Ma (with 95% of credibility, MSWD=3.0), and Rb_Sr isochron age of quartz from ore_bearing q u artz vein is (357±15) Ma (with 95% of credibility, MSWD=0.16), whereas Rb_Sr i s ochron age of quartz from ore_bearing quartz vein in the Beishan gold deposit of Naomaohu is (346±10) Ma (with 95% of credibility, MSWD=0.19). The above ages i ndicate that porphyry copper deposits and gold deposits of the fracture zone alt ered rock type were formed in Late Devonian and Early Carboniferous. Mineralizat ions of porphyry copper_gold deposits of Yunyingshan style and gold deposits of Naomaohu style were related to volcanic and sub_volcanic magmatic activities dur ing the convergent stage of Devonian_Carboniferous period. It is also held that it is promising to explore copper and gold polymetallic deposits in Qiongheba area. |
| keywords:geochemistry, geochronology, copper_gold deposit, Qiongheba a rea of Yiwu County, Xinjiang |
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