| 内蒙古双尖子山银多金属矿床侏罗纪成矿的年代学证据及其找矿意义 |
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| 引用本文： | 欧阳荷根,李睿华,周振华.内蒙古双尖子山银多金属矿床侏罗纪成矿的年代学证据及其找矿意义[J].地质学报,2016,90(8):1835-1845. |
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| 作者姓名： | 欧阳荷根 李睿华 周振华 |
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| 作者单位： | 中国地质科学院矿产资源研究所,中国地质科学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室，北京，100037,中国地质科学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室，北京，100037 |
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| 基金项目： | 本文为国家自然科学基金项目（41403042）和中央级科研院所基本科研业务费项目（K1414）联合资助的成果。 |
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| 摘 要： | 双尖子山银多金属矿床是近年来在大兴安岭南段发现的一超大型规模矿床,其银资源量为2.6×10~4t,锌3.3Mt,铅1.1Mt,但矿床的成矿时代目前还未得到精确的厘定,这制约了对矿床成因、区域成矿规律及找矿方向的认识。本文在详细的矿床地质特征调查基础上,识别出了与双尖子山银多金属矿床成矿有关的斑状花岗岩。该岩体内部发育浸染状方铅矿和矿化的隐爆角砾岩,岩体外接触带硅化、绿泥石化及银铅锌矿化强烈,这指示双尖子山矿床的银铅锌矿化和蚀变作用与斑状花岗岩的侵入作用密切相关。鉴于此,作者对斑状花岗岩的锆石进行了LA-MC-ICP-MS U-Pb定年,获得该岩体16颗锆石的~(206)Pb/~(238)U加权平均年龄为159.3±2.3Ma,该年龄可近似代表双尖子山矿床的成矿年龄。上述结果表明,双尖子山银多金属矿床为与晚侏罗世斑状花岗岩有关的热液脉型矿床。尽管精确的成矿年龄数据已揭示大兴安岭南段存在侏罗纪成矿事件,但大多数的观点认为早白垩世(~135Ma)是大兴安岭南段内生金属矿床成矿作用的峰期,因此忽视了侏罗纪成矿事件的重要性。鉴于双尖子山矿床银、铅和锌的资源量均已达超大型矿床规模,作者认为,大兴安岭南段侏罗纪成矿作用的强度可能并不亚于早白垩世,应在今后的找矿勘察中得到足够的重视。
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| 关 键 词： | 双尖子山、大兴安岭南段、热液脉型矿床、斑状花岗岩、隐爆角砾岩 |
| 收稿时间： | 2016/5/18 0:00:00 |
| 修稿时间： | 2016/5/18 0:00:00 |
The Jurassic Mineralization of the Shuangjianzisha Ag polymetallic Deposit and its Significance in Prospecting: Evidence from Geochronology |
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| ouyanghegen,LI Ruihua and ZHOU Zhenghua.The Jurassic Mineralization of the Shuangjianzisha Ag polymetallic Deposit and its Significance in Prospecting: Evidence from Geochronology[J].Acta Geologica Sinica,2016,90(8):1835-1845. |
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| Authors: | ouyanghegen LI Ruihua and ZHOU Zhenghua |
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| Institution: | Institute of Mineral Resources, Chinese Academy of Geological Sciences,MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037 and MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037 |
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| Abstract: | The Shuangjianzishan Ag-polymetallic deposit is a newly discovered super-large deposit in the southern Great Xing''an Range. However, the mineralization age which affects the understanding of the genesis of this deposit and the regional metallogeny in the southern Great Xing''an Range is still a pending question. In this study, zircon U-Pb dating by LA-MC-INP-MS of the porphyritic granite related to the Ag-polymetallic minerlazation was conducted. The results show that the formation age of the porphyritic granite is 159.3±2.3 Ma. It indicates that the Shuangjianzishan deposit is a vein-type deposit relating to the Late Jurrasic porphyritic granite. We proposed that the importance and intensity of the Jurassic mineralization in the southern Great Xing''an Range may not be second to the Early Cretaceous, and must be taken into account in the upcoming prospecting works. |
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