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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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。


The Jurassic Mineralization of the Shuangjianzisha Agpolymetallic Deposit and its Significance in Prospecting: Evidence from Geochronology
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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,但该矿床的成矿时代还未得到精确的厘定,这制约了对矿床成因及区域成矿规律的认识。本文在详细的矿床地质特征调查基础上,识别出了与成矿有关的斑状花岗岩,对其进行了LA-MC-ICP-MS锆石U-Pb测年。斑状花岗岩的锆石U-Pb年龄为159.3±2.3 Ma,该年龄可近似代表双尖子山矿床的成岩年龄,这表明矿床为与晚侏罗世斑状花岗岩有关的热液脉型矿床。鉴于双尖子山矿床银、铅、锌的资源量均已达超大型矿床规模,我们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,在后期的找矿勘察中应得到足够的重视。

    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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欧阳荷根,李睿华,周振华.2016.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,90(8):1835-1845.
ouyanghegen, LI Ruihua, ZHOU Zhenghua.2016. The Jurassic Mineralization of the Shuangjianzisha Agpolymetallic Deposit and its Significance in Prospecting: Evidence from Geochronology[J]. Acta Geologica Sinica,90(8):1835-1845.

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  • 收稿日期:2016-05-18
  • 最后修改日期:2016-05-18
  • 录用日期:2016-08-23
  • 在线发布日期: 2016-08-23
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