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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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206Pb/238U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。
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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致谢: 野外工作得到西藏金泰矿业公司徐仲勋总工程师、西藏地勘局第五地质大队驻德新矿区工作人员及“西藏则学地区矿产远景调查”项目组成员的热情指导和帮助，锆石U-Pb定年工作得到中国地质大学（武汉）地质过程与矿产资源国家重点实验室胡兆初老师的帮助，在此一并表示诚挚的感谢。
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图 2 德新矿区地质图①
Q—第四系；E2n—年波组火山岩；C2-P1l2—拉嘎组上段含砾砂板岩；C2-P1l1—拉嘎组下段粉砂质板岩；K2δ—晚白垩世闪长岩；δμ—闪长玢岩；1—正断层；2—逆断层；3—地质界线；4—含矿花岗斑岩；5—银铅锌多金属矿体；6—采样位置
Figure 2. Geological map of the Dexin Ag-Pb-Zn deposit, Tibet
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图 3 西藏德新矿区花岗斑岩锆石阴极发光图像
Figure 3. Cathodoluminescence (CL) images of zircon from the granite porphyry in Dexin deposit, Tibet
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图 4 西藏德新矿区花岗斑岩（DX1-QP01）锆石U-Pb谐和图
Figure 4. U-Pb concordia diagram of the zircon from the granite porphyry in Dexin deposit, Tibet
表 1 西藏德新矿区花岗斑岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1 Zircon LA-ICP-MS U-Th-Pb data of the granite porphyry in Dexin deposit, Tibet
样品编号 Th/10-6 U/10-6 Th/U 同位素比值 同位素年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ DX1-QP01-01 3042 8204 0.37 0.04874 0.00207 0.06110 0.00252 0.00911 0.00012 135 91 60 2 58.5 0.7 DX1-QP01-02 3151 8263 0.38 0.04548 0.00170 0.05584 0.00213 0.00889 0.00011 -30 75 55 2 57.1 0.7 DX1-QP01-03 2542 6910 0.37 0.04798 0.00198 0.05962 0.00245 0.00898 0.00010 98 89 59 2 57.6 0.7 DX1-QP01-04 2174 7951 0.27 0.04678 0.00226 0.05612 0.00266 0.00866 0.00011 38 99 55 3 55.6 0.7 DX1-QP01-05 3394 9888 0.34 0.04785 0.00180 0.05968 0.00240 0.00895 0.00013 92 85 59 2 57.4 0.8 DX1-QP01-06 2928 7086 0.41 0.04798 0.00202 0.06019 0.00247 0.00911 0.00011 98 88 59 2 58.5 0.7 DX1-QP01-07 2849 6044 0.47 0.04740 0.00194 0.05883 0.00244 0.00895 0.00011 69 88 58 2 57.4 0.7 DX1-QP01-08 3307 8903 0.37 0.04898 0.00180 0.06064 0.00222 0.00895 0.00012 147 80 60 2 57.5 0.8 DX1-QP01-09 2781 5510 0.50 0.04846 0.00239 0.06107 0.00302 0.00915 0.00011 122 109 60 3 58.7 0.7 DX1-QP01-10 1567 1474 1.06 0.05111 0.00433 0.06390 0.00494 0.00933 0.00018 246 172 63 5 60.0 1.0 DX1-QP01-11 3641 8126 0.45 0.04732 0.00189 0.05905 0.00239 0.00900 0.00012 66 84 58 2 57.8 0.8 DX1-QP01-12 5313 12458 0.43 0.04611 0.00183 0.05683 0.00239 0.00885 0.00014 4 82 56 2 56.8 0.9 DX1-QP01-13 2698 8829 0.31 0.04500 0.00172 0.05562 0.00211 0.00893 0.00011 -19 74 55 2 57.3 0.7 DX1-QP01-14 3129 7990 0.39 0.04814 0.00186 0.06072 0.00235 0.00906 0.00010 106 84 60 2 58.2 0.7 DX1-QP01-15 1027 885 1.16 0.04923 0.00534 0.05967 0.00629 0.00908 0.00022 159 230 59 6 58.0 1.0 
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