| 西藏冈底斯中西段主碰撞期成矿事件——德新矿区花岗斑岩锆石U-Pb年龄证据 |
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| 引用本文： | 柯贤忠,龙文国,周岱,王晶,钟石玉.西藏冈底斯中西段主碰撞期成矿事件——德新矿区花岗斑岩锆石U-Pb年龄证据[J].地质通报,2017,36(5):772-779. |
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| 作者姓名： | 柯贤忠 龙文国 周岱 王晶 钟石玉 |
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| 作者单位： | 1. 中国地质调查局武汉地质调查中心, 湖北 武汉 430205;2. 湖北省地质调查院, 湖北 武汉 430034 |
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| 基金项目： | 中国地质调查局项目《钦杭西段关键地区区域地质调查》（编号：12120113066400）、《信宜－增城－龙川构造混杂岩带研究》（编号：12120114039201）、《钦杭成矿带西段资源远景调查评价》（编号：12120113067200） |
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| 摘 要： | 德新银铅锌矿床位于拉萨地块中部隆格尔-工布江达断隆带中段,是冈底斯银铅锌多金属成矿带上典型的热液型矿床之一。区内的铅锌矿化主要赋存于围岩裂隙和花岗斑岩中。利用LA-ICP-MS锆石U-Pb测年方法对区内含矿花岗斑岩进行年龄测定,获得~(206)Pb/~(238)U年龄加权平均值为57.7±0.5Ma(MSWD=1.6,n=15),代表花岗斑岩及与之相关的铅锌矿化形成年龄。综合区域地质背景,认为德新矿区与花岗斑岩有关的铅锌矿化形成于印度-亚洲大陆主碰撞时期,与纳如松多隐爆角砾岩型铅锌矿属同一岩浆成矿系统,冈底斯中西段存在(近)主碰撞阶段成矿事件。
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| 收稿时间： | 2015/12/15 0:00:00 |
| 修稿时间： | 2016/6/13 0:00:00 |
Metallogenesis of the main collisional period in mid-western Gangdise:Zir-con U-Pb geochronology of the granite porphyry in Dexin deposit,Tibet |
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| KE Xianzhong,LONG Wenguo,ZHOU Dai,WANG Jing and ZHONG Shiyu.Metallogenesis of the main collisional period in mid-western Gangdise:Zir-con U-Pb geochronology of the granite porphyry in Dexin deposit,Tibet[J].Geologcal Bulletin OF China,2017,36(5):772-779. |
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| Authors: | KE Xianzhong LONG Wenguo ZHOU Dai WANG Jing and ZHONG Shiyu |
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| Institution: | 1. Wuhan Center of Geological Survey, CGS, Wuhan 430205, Hubei, China;2. Hubei Geological Survey, Wuhan 430034, Hubei, China |
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| Abstract: | The Dexin Ag-Pb-Zn deposit,located in the Longgeer-Gongbujiangda fault-block uplift belt at the center of Lhasa Ter-rane,is one of the representative hydrothermal type deposits in the Gangdise Ag-Pb-Zn polymetallic ore-forming belt.The Pb-Zn mineralization dominantly occurs in the fractures of wall rocks and the granitic porphyries.Zircons from the ore-bearing granitic por-phyry in Dexin were measured by the LA-ICP-MS U-Pb dating method,which yielded a weighted average 206Pb/238U age of 57.7±0.5Ma (MSWD=1.6,n=15) that represents the formation age of the granitic porphyries and the Pb-Zn mineralization in the granitic porphyries.With a comprehensive analysis of geological background,it is concluded that the Pb-Zn mineralization associated with the granitic porphyries in Dexin and the cryptoexplosive breccia type Pb-Zn mineralization in Narusongduo were formed by the same magmatic metallogenic system,and there were many magmatic-metallogenic events near/in the main Indian-Asian collisional period in the mid-west part of Gangdise. |
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| Keywords: | granitic porphyry zircon U-Pb age Dexin Tibet |
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