| 西藏甲玛矿区侵入岩成岩成矿年龄 |
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| 引用本文： | 李波,胡道功,林广奇,徐聪聪,张瑞鹏,张翼飞.西藏甲玛矿区侵入岩成岩成矿年龄[J].现代地质,2016,30(6):1234-1243. |
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| 作者姓名： | 李波 胡道功 林广奇 徐聪聪 张瑞鹏 张翼飞 |
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| 作者单位： | 1山东省地矿工程勘察院，山东 济南250014； 2 中国地质科学院 地质力学研究所，北京100081 |
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| 基金项目： | 中国地质调查局项目（1212011120185） |
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| 摘 要： | 摘要：西藏甲玛铜多金属矿床位于冈底斯成矿带东段，属于超大型斑岩-矽卡岩型矿床，具有巨大的成矿潜力。铜多金属矿床的成矿作用主要受控于NS向正断层及其受断裂控制的具有埃达克岩地球化学特征的中酸性斑岩体。利用锆石LA ICP MS U Pb测年方法对矿区含矿与不含矿的中酸性斑岩脉进行了年龄测定，3件样品的岩浆锆石U Pb年龄为14~16 Ma，表明甲玛铜多金属矿床及矿区与成矿有关的岩脉均形成于中新世早期；利用ESR测年方法，获得含矿石英脉年龄139~164 Ma，含矿方解石脉年龄5~7 Ma，测年结果表明甲玛矿区主要成岩成矿作用同期，形成于中新世早期，并在中新世晚期受构造运动影响仍然存在较弱的成矿作用。
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| 关 键 词： | 甲玛矿床 锆石U-Pb年龄 ESR年龄 中新世 西藏 |
The Diagenesis and Metallogenesis Age of the Intrusive Rock in Jiama Deposit in Tibet |
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| LI Bo,HU Daogong,LIN Guangqi,XU Congcong,ZHANG Ruipeng,ZHANG Yifei.The Diagenesis and Metallogenesis Age of the Intrusive Rock in Jiama Deposit in Tibet[J].Geoscience——Journal of Graduate School,China University of Geosciences,2016,30(6):1234-1243. |
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| Authors: | LI Bo HU Daogong LIN Guangqi XU Congcong ZHANG Ruipeng ZHANG Yifei |
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| Institution: | 1Shandong Geo engineering Exploration Institute，Jinan, Shandong250014，China;
2Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing100081,China |
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| Abstract: | Abstract: The Jiama copper multi metal deposit in Tibet lies in the eastern part of the Gangdisi metallogenic belt. It belongs to super large porphyry skarn type deposit and has great potential for mineralization. The mine ralization in the mining area is controlled by the NS normal fault, which offer the space for metallic element enrichment and magmatic hydrothermal rise. In this paper, LA ICP MS zircon U Pb dating was used to study the porphyry and skarn age. The dating results show that the diagenesis and mineralization age of the mining area is 14-16 Ma, and the ESR dating results show that the quartz veins age is 139-164 Ma, the calcite veins age is 5-7 Ma. The dating results show that the diagenesis and the metallogenesis are both in the Miocene period, in the later period, there are still weak metallogenesis in Jiama deposit influenced by tectonic movement. |
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| Keywords: | Jiama deposit zircon U Pb dating ESR dating Miocene Tibet |
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