| 新疆元宝山金矿床锆石U-Pb、全岩Rb-Sr年代学及其地质意义 |
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| 引用本文： | 段瑞春,杨红梅,刘重芃,张利国,童喜润.新疆元宝山金矿床锆石U-Pb、全岩Rb-Sr年代学及其地质意义[J].矿床地质,2017,36(2):449-462. |
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| 作者姓名： | 段瑞春 杨红梅 刘重芃 张利国 童喜润 |
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| 作者单位： | 中国地质调查局武汉地质调查中心, 湖北 武汉 430205;中国地质大学资源学院, 湖北 武汉 430074;中国地质调查局花岗岩成岩成矿地质研究中心, 湖北 武汉 430205,中国地质调查局武汉地质调查中心, 湖北 武汉 430205;中国地质调查局花岗岩成岩成矿地质研究中心, 湖北 武汉 430205,中国地质调查局武汉地质调查中心, 湖北 武汉 430205;中国地质调查局花岗岩成岩成矿地质研究中心, 湖北 武汉 430205,中国地质调查局武汉地质调查中心, 湖北 武汉 430205;中国地质调查局花岗岩成岩成矿地质研究中心, 湖北 武汉 430205,中国地质调查局武汉地质调查中心, 湖北 武汉 430205;中国地质调查局花岗岩成岩成矿地质研究中心, 湖北 武汉 430205 |
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| 基金项目： | 本文得到中国地质调查局地质调查项目（编号：12120114005701、DD20160029）和公益性行业专项（编号：201411075）联合资助 |
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| 摘 要： | 元宝山金矿床位于新疆鄯善县境内,属于东天山康古尔塔格金矿带,受秋格明塔什-黄山韧性剪切带控制。为探讨元宝山金矿床的成矿时代及其地质意义,本次研究开展了矿石石英Rb-Sr年代学、含矿围岩Rb-Sr、Sm-Nd及锆石U-Pb同位素年代学分析。(255.6±1.0)Ma的含矿围岩Rb-Sr同位素等时线年龄以及(256±14)Ma的石英Rb-Sr等时线年龄,限定了该矿床的形成时代,而(334.7±9.8)Ma的含矿围岩锆石U-Pb年代学数据表明,该矿床的含矿围岩为中石炭统。Sr、Nd同位素特征表明,成矿物质来源具有幔源特征并有壳源物质参与,而区内韧性剪切带右行走滑剪切及随后的抬升作用导致的压力和温度的降低应是元宝山金矿床形成的动力学背景。
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| 关 键 词： | 地球化学 锆石U-Pb测年 Rb-Sr测年 成矿时代 元宝山金矿床 东天山 |
| 收稿时间： | 2016/10/13 0:00:00 |
| 修稿时间： | 2017/2/25 0:00:00 |
Zircon U-Pb and whole rock Rb-Sr dating of Yuanbaoshan gold deposit in Xinjiang and its geological significance |
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| DUAN RuiChun,YANG HongMei,LIU ChongPeng,ZHANG LiGuo and TONG XiRun.Zircon U-Pb and whole rock Rb-Sr dating of Yuanbaoshan gold deposit in Xinjiang and its geological significance[J].Mineral Deposits,2017,36(2):449-462. |
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| Authors: | DUAN RuiChun YANG HongMei LIU ChongPeng ZHANG LiGuo and TONG XiRun |
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| Institution: | Wuhan Center of Geological Survey, CGS, Wuhan 430205, Hubei, China;China University of Geosciences, Faculty of Earth Resource, Wuhan 430074, Hubei, China;Research Center for Petrogenesis and Mineralization of Granitoid Rocks, CGS, Wuhan 430205, Hubei, China,Wuhan Center of Geological Survey, CGS, Wuhan 430205, Hubei, China;Research Center for Petrogenesis and Mineralization of Granitoid Rocks, CGS, Wuhan 430205, Hubei, China,Wuhan Center of Geological Survey, CGS, Wuhan 430205, Hubei, China;Research Center for Petrogenesis and Mineralization of Granitoid Rocks, CGS, Wuhan 430205, Hubei, China,Wuhan Center of Geological Survey, CGS, Wuhan 430205, Hubei, China;Research Center for Petrogenesis and Mineralization of Granitoid Rocks, CGS, Wuhan 430205, Hubei, China and Wuhan Center of Geological Survey, CGS, Wuhan 430205, Hubei, China;Research Center for Petrogenesis and Mineralization of Granitoid Rocks, CGS, Wuhan 430205, Hubei, China |
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| Abstract: | The Yuanbaoshan gold deposit, located in Shanshan County of Xinjiang, belongs to the Kanggurtage gold belt of eastern Tianshan Mountains. The deposit is controlled by the Qiugemingtashi-Huangshan ductile shear zone. In order to investigate the ore-forming age of the Yuanbaoshan gold deposit and its geological significance, the authors analyzed the Rb-Sr isotope composition of fluid inclusions in quartz and the ore-bearing rock. The Sm-Nd isotope composition of mineralized whole rock and U-Pb dating of zircon from the rock were all carried out. The ore-bearing rock yielded an Rb-Sr isochron age of (255.6±1.0) Ma, which is in agreement with the (256±14) Ma obtained by quartz within error, indicating that the Yuanbaoshan gold deposit was formed at 256 Ma. The U-Pb dating of the mineralized whole rock yielded an age of (334.7±9.8) Ma, revealing that the ore-bearing rock belongs to middle Carboniferous strata. The characteristics of Sr and Nd isotope indicate that the metallogenic material had the mantle-derived attribute with the addition of some crust matters. The decrease of pressure and temperature caused by the dextral strike-slip and subsequent uplift action constituted the main dynamic mechanism for the formation of the Yuanbaoshan gold deposit. |
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| Keywords: | geochemistry zircon U-Pb dating Rb-Sr dating ore-forming age Yuanbaoshan gold deposit East Tianshan |
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