| 内蒙古沙麦钨矿区高分异花岗岩独居石U-Pb定年及成矿意义 |
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| 引用本文： | 宓奎峰,杨艳,颜廷杰,吕志成,柳振江.内蒙古沙麦钨矿区高分异花岗岩独居石U-Pb定年及成矿意义[J].现代地质,2020,34(3):504-513. |
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| 作者姓名： | 宓奎峰 杨艳 颜廷杰 吕志成 柳振江 |
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| 作者单位： | 1.中国地质调查局发展研究中心,北京 1000372.自然资源部矿产勘查技术指导中心,北京 1000833.中国地质大学(北京) 地球科学与资源学院,北京 100083 |
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| 基金项目： | 国家重点研发计划重点专项“深地资源勘查开采”(2018YFC0603806);国家自然科学基金项目(41802115);国家自然科学基金项目(41702098);中国地质调查局地质调查项目(DD20190166);内蒙古自治区地质勘查基金项目(2014-01-YS01) |
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| 摘 要： | 兴蒙造山带是中国北方重要的多金属成矿带,产出有一系列的钨多金属矿床。沙麦钨矿位于内蒙古二连浩特—东乌旗成矿带东侧,是兴蒙造山带发育的典型石英脉型钨矿床之一。通过对沙麦矿区出露的花岗岩开展独居石U-Pb测年,总结区域钨矿化的成矿年龄与矿化特征,探讨区域钨矿成矿时序及构造动力学背景。测年结果显示,沙麦矿区中细粒黑云母二长花岗岩、似斑状黑云母二长花岗岩LA-ICP-MS独居石U-Pb谐和年龄分别为(141.6±1.1) Ma 和(141.4±0.3) Ma,进一步确认沙麦钨矿形成于早白垩世。而二连浩特—东乌旗成矿带及其邻区钨矿化存在晚石炭世—早二叠世、早白垩世两期,成矿时代分别发生于约300 Ma和140~130 Ma。300 Ma成矿期钨成矿作用受古亚洲洋的影响;140~130 Ma成矿期为区域钨矿成矿作用高峰期,成矿作用受到古太平洋和蒙古—鄂霍次克洋构造体系叠加作用的影响。
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| 关 键 词： | 沙麦钨矿 高分异花岗岩 独居石U-Pb测年 二连浩特—东乌旗成矿带 |
| 收稿时间： | 2019-01-02 |
| 修稿时间： | 2019-12-20 |
In-situ Monazite U-Pb Geochronology of Highly Fractionated Granites in Shamai Tungsten Deposit,Inner Mongolia and Its Mineralization Significance |
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| MI Kuifeng,YANG Yan,YAN Tingjie,Lü Zhicheng,LIU Zhenjiang.In-situ Monazite U-Pb Geochronology of Highly Fractionated Granites in Shamai Tungsten Deposit,Inner Mongolia and Its Mineralization Significance[J].Geoscience——Journal of Graduate School,China University of Geosciences,2020,34(3):504-513. |
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| Authors: | MI Kuifeng YANG Yan YAN Tingjie LÜ Zhicheng LIU Zhenjiang |
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| Institution: | 1. Development and Research Center, China Geological Survey, Beijing 100037, China2. Technical Guidance Center for Mineral Resources Exploration, Ministry of Natural Resources of People’s Republic of China, Beijing 100083, China3. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The Xing’an-Mongolia Orogenic Belt (XMOB) is an important metallogenic belt in northern China, hosting a series of tungsten polymetallic deposits. The Shamai tungsten deposit, located in the eastern part of the Erenhot-Dongwuqi metallogenic belt in the XMOB, is a typical quartz-vein hosted tungsten deposit. In this paper, in-situ LA-ICP-MS monazite U-Pb dating was used to determine the ages of the ore-bearing granites at Shamai, and the metallogenic epoch and geodynamic background of the regional tungsten mineralization were discussed. The monazite from the medium-grained biotite monzogranite and porphyritic biotite monzogranite, yield concordant ages of (141.6±1.1) Ma and (141.4±0.3) Ma, respectively, reflecting their crystallization ages. Tungsten mineralization in the Erenhot-Dongwuqi metallogenic belt occurred in two stages at ca. 300 Ma and ca. 140-130 Ma. The former stage was likely related to the subduction of the Paleo-Asian ocean, while the latter stage was likely co-influenced by the (post)-subduction tectonics of the Mongol-Okhotsk Ocean and the Paleo-Pacific Ocean. |
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| Keywords: | Shamai Tungsten deposit highly fractionated granite in-situ monazite U-Pb age Erenhot-Dongwuqi metallogenic belt |
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