| 东昆仑祁漫塔格地区白干湖钨锡矿田白云母~(40)Ar/~(39)Ar定年及地质意义 |
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| 引用本文： | 郑震,陈衍景,邓小华,岳素伟,陈红瑾.东昆仑祁漫塔格地区白干湖钨锡矿田白云母~(40)Ar/~(39)Ar定年及地质意义[J].中国地质,2016(4):1341-1352. |
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| 作者姓名： | 郑震 陈衍景 邓小华 岳素伟 陈红瑾 |
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| 作者单位： | 北京大学造山带与地壳演化重点实验室, 北京 100861,北京大学造山带与地壳演化重点实验室, 北京 100861,北京矿产地质研究所, 北京 100012,华南理工大学广州学院, 广东 广州 510802,北京大学造山带与地壳演化重点实验室, 北京 100861 |
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| 基金项目： | 中国地质调查局项目“环塔里木前寒武纪铜镍-钨锡矿成矿规律及找矿方向”（1212011140056）资助。 |
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| 摘 要： | 东昆仑祁漫塔格地区白干湖钨锡矿田是认识中国西北地区钨锡矿床成矿规律的重要窗口。作者对采自含矿石英脉的2个白云母样品进行40Ar/39Ar定年,获得其坪年龄分别为(422.7±4.5)Ma和(421.8±2.7)Ma。2个样品的等时线年龄与反等时线年龄也在误差范围内一致,分别为(424±15)Ma和(418±24)Ma,表明分析数据可信。获得的白云母40Ar/39Ar坪年龄指示成矿作用发生在晚志留世,与原特提斯洋闭合事件密切相关,闭合后的陆陆碰撞使富含成矿物质的变质沉积物重熔而形成花岗岩浆;花岗岩浆侵入并析出含矿热液,导致钨锡成矿。
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| 关 键 词： | 40Ar/39定年 白云母 白干湖钨锡矿田 祁漫塔格 东昆仑造山带 |
| 收稿时间： | 2016/3/14 0:00:00 |
| 修稿时间： | 2016/6/20 0:00:00 |
Muscovite 40Ar/39Ar dating of the BaiganhuW-Sn orefield, Qimantag, East Kunlun Mountains, and its geological implications |
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| ZHENG Zhen,CHEN Yan-jing,DENG Xiao-hu,YUE Su-wei and CHEN Hong-jin.Muscovite 40Ar/39Ar dating of the BaiganhuW-Sn orefield, Qimantag, East Kunlun Mountains, and its geological implications[J].Chinese Geology,2016(4):1341-1352. |
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| Authors: | ZHENG Zhen CHEN Yan-jing DENG Xiao-hu YUE Su-wei and CHEN Hong-jin |
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| Institution: | Key Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China,Key Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China,Beijing Institute of Geology for Mineral Resources, Beijing 100012, China,Guangzhou College, South China University of Technology, Guangzhou 510802, Guangdong China and Key Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China |
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| Abstract: | The newly discovered Baiganhu W-Sn ore district in Qimantag of East Kunlun orogenic belt provides a key window to insight into the W-Sn mineralization in Northwest China. In this paper, the authors present results from the 40Ar/39Ar dating of two muscovite samples collected from the ore-bearing quartz veins in the Baiganhu W-Sn ore district, which yielded two 40Ar/39Ar plateau ages of 422.7 ±4.5 Ma and 421.8 ±2.7 Ma, respectively. These two samples also yielded consistent (within errors) isochronal and inverse isochronal ages of 424 ±15 Ma and 418 ±24 Ma, respectively, suggesting that the analytical results are reliable. The new plateau ages show that the mineralization occurred in the Late Silurian, associated with the tectonic-thermal events induced by the closure of Proto-Tethys. The post-subduction continental collision caused the formation of granitic magmas sourced from remelting of the metalliferous metamorphosed Proterozoic sediments. The W-Sn mineralization resulted by the hydrothermal fluids exsolved from the granitic magmas during their upward emplacement. |
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| Keywords: | 40Ar/39Ar dating muscovite BaiganhuW-Sn ore district Qimantag East Kunlun orogenic belt |
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