| 江西九瑞地区宝山斑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 |
| Received:May 26, 2014 Revised:December 27, 2014 点此下载全文 |
| 引用本文：JIA LiQiong,XU WenYi,YANG Dan,YANG ZhuSen,WANG Liang.2015.Zircon U-Pb and molybdenite Re-Os dating of Baoshan porphyry Cu polymetallic deposit in Jiujiang-Ruichang ore concentration area of Jiangxi Province and its geological significance[J].Mineral Deposits,34(1):63~80 |
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| Author Name | Affiliation | | JIA LiQiong | State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | XU WenYi | MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | YANG Dan | MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | YANG ZhuSen | MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | WANG Liang | State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
Gold Geology Institute of Chinese Armed Police Force, Langfang 065000, Hebei, China |
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| 基金项目:本文由国家十二五科技支撑计划课题(项目编号:2009BAB43B03,2011BAB04B03)、国家深部探测技术与实验研究专项(SinoProbe-03-06)和国土资源部公益性行业科研专项项目(项目编号:201311166(SinoProbe-03-07))联合资助 |
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| 中文摘要:宝山斑岩型铜多金属矿床位于九瑞矿集区西北部,隶属于九江-瑞昌铜金矿田,为长江中下游铜金成矿带、大冶-九江成矿亚带的组成部分。对宝山岩体的花岗闪长斑岩进行LA-MC-ICP-MS U-Pb同位素测年,获得其锆石U-Pb年龄为(147.81±0.48) Ma(MSWD=1.07);首次对宝山矿床的辉钼矿进行Re-Os同位素定年,获得矿床的成矿年龄:6件辉钼矿的Re-Os同位素模式年龄范围为(146.1±2.2) Ma~(148.7±2.0) Ma,加权平均年龄为(147.42±0.84) Ma,等时线年龄为(147.7±1.2) Ma。成岩年龄与成矿年龄在误差范围内一致。辉钼矿的Re含量指示宝山矿床的成矿物质来自于壳幔混源。宝山矿区的成岩、成矿时代与九瑞矿集区典型岩体和矿床的成岩、成矿时代相似,也与长江中下游地区铜陵、安庆和鄂东南(部分地区)的典型铜多金属矿床的成岩、成矿时代基本一致,都属于长江中下游成矿带早白垩世多金属成矿事件的一部分。 |
| 中文关键词:地球化学 锆石U-Pb年龄 辉钼矿Re-Os年龄 斑岩铜多金属矿 成矿背景 宝山矿床 九瑞矿集区 |
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| Zircon U-Pb and molybdenite Re-Os dating of Baoshan porphyry Cu polymetallic deposit in Jiujiang-Ruichang ore concentration area of Jiangxi Province and its geological significance |
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| Abstract:Located in the northwestern part of the Jiujiang-Ruichang ore concentration area, the Baoshan porphyry Cu polymetallic deposit belongs to the Jiujiang-Ruichang Cu-Au orefield and is a component part of the Daye-Jiujiang metallogenic subzone along the Middle-Lower Yangtze River Cu-Au metallogenic belt. The U-Pb LA-MC-ICP MS dating of the zircons from Baoshan granodiorite porphyry yielded an age of (147.81±0.48) Ma(MSWD=1.07). Six molybdenite samples separated from the Baoshan deposit were used for Re-Os dating, which yielded the model ages ranging from (146.1±2.2) Ma to (148.7±2.0) Ma, weighted average age of (147.42±0.84) Ma and an isochron age of (147.7±1.2) Ma. These ages suggest that the mineralization in the Baoshan deposit was genetically associated with the granodiorite porphyry, and the rock- and ore-forming process was continuous. The Re content of molybdenite indicates that the ore-forming materials were derived from the mixture of the mantle and the crust. These data indicate that ages of the intrusion and orebody from the Baoshan deposit are almost identical with ages of other typical magmatic intrusions and deposits in the Jiujiang-Ruichang metallogenic belt, and even similar to ages of typical Cu polymetallic ore deposits in Tongling, Anqing and part of southeast Hubei in the Middle-Lower Yangtze River metallogenic belt, all being part of the Early Cretaceous polymetallic metallogenic events in the Middle-Lower Yangtze River metallogenic belt. |
| keywords:geochemistry zircon U-Pb age molybdenite Re-Os age porphyry copper-polymetallic deposit metallogenic setting Baoshan deposit Jiujiang-Ruichang ore concentration area |
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