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| 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 | |
| 引用本文： | 贾丽琼,徐文艺,杨丹,杨竹森,王梁.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[J].矿床地质,2015,34(1):63-80. |
| 作者姓名： | 贾丽琼 徐文艺 杨丹 杨竹森 王梁 |
| 作者单位： | 1. 中国地质大学地质过程与矿产资源国家重点实验室,地球科学与资源学院,北京100083;中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京100037 2. 中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京100037 3. 中国地质大学地质过程与矿产资源国家重点实验室,地球科学与资源学院,北京100083;武警黄金地质研究所,河北廊坊065000 |
| 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 |
| 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。 |
| 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 |
| 收稿时间： | 2014/5/26 0:00:00 |
| 修稿时间： | 2014/12/27 0:00:00 |
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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| JIA LiQiong,XU WenYi,YANG Dan,YANG ZhuSen and WANG Liang.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,2015,34(1):63-80. | |
| Authors: | JIA LiQiong XU WenYi YANG Dan YANG ZhuSen and WANG Liang |
| Institution: | 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;MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;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 |
| 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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