ISSN 1009-6248CN 61-1149/P 双月刊

主管单位：中国地质调查局

主办单位：中国地质调查局西安地质调查中心
中国地质学会

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    段忠志, 何世平, 计波, 时超, 王立轩, 魏小燕. 甘肃榆中县黄崖口铅锌矿赋矿岩系变流纹岩锆石U-Pb年龄及其地质意义[J]. 西北地质,2021,54(2): 30-42.
    引用本文: 段忠志, 何世平, 计波, 时超, 王立轩, 魏小燕. 甘肃榆中县黄崖口铅锌矿赋矿岩系变流纹岩锆石U-Pb年龄及其地质意义[J]. 西北地质,2021,54(2): 30-42.
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    DUAN Zhongzhi, HE Shiping, JI Bo, SHI Chao, WANG Lixuan, WEI Xiaoyan. Zircon U-Pb Age of the Meta-rhyolite of Huangyakou Lead-zinc Deposit and Its Geological Significance in Yuzhong County, Gansu Province[J]. Northwestern Geology,2021,54(2): 30-42.
    Citation: DUAN Zhongzhi, HE Shiping, JI Bo, SHI Chao, WANG Lixuan, WEI Xiaoyan. Zircon U-Pb Age of the Meta-rhyolite of Huangyakou Lead-zinc Deposit and Its Geological Significance in Yuzhong County, Gansu Province[J]. Northwestern Geology,2021,54(2): 30-42.
    shu

    甘肃榆中县黄崖口铅锌矿赋矿岩系变流纹岩锆石U-Pb年龄及其地质意义

    Zircon U-Pb Age of the Meta-rhyolite of Huangyakou Lead-zinc Deposit and Its Geological Significance in Yuzhong County, Gansu Province

      摘要
    • 摘要: 黄崖口铅锌矿位于白银矿田外围，一直被认为与小铁山铅锌矿成矿特征类似，是白银矿区外围找矿的重点地段之一。通过对黄崖口铅锌矿区与成矿密切相关的变酸性火山岩LA-ICP-MS锆石U-Pb同位素测年，获得铅锌矿赋矿岩系变流纹岩的形成年龄为（507.6±1.8）Ma（MSWD=0.23，Points=23），属于中寒武世。该年龄可代表黄崖口铅锌矿的形成时代，故认为黄崖口铅锌矿形成于中寒武世。结合前人研究成果，白银铜多金属矿形成时代为（467.1±2.2）～（465.0±3.7）Ma，属于中奥陶世，黄崖口铅锌矿的形成时代早于白银铜多金属矿。因此，初步提出白银铜多金属矿田及外围具有多期成矿特征，该认识对白银矿田外围找矿具有重要指示意义。

       

      Abstract: Huangyakou lead-zinc deposit is located outside Baiyin orefield,being the main prospecting mining areas. Its metallogenic characteristics have long been considered to be similar to that of Xiaotieshan lead-zinc deposit. Through the LA-ICP-MS zircon U-Pb isotope dating of the meta-acid volcanic rocks in Huangyakou lead-zinc deposit,the age of meta-rhyolite is(507.6±1.8) Ma (MSWD=0.23, Points=23), belonging to the Middle Cambrian.This is also the formation age of Huangyakou lead-zinc deposit.On the basis of previous research,it is held that Baiyin copper polymetallic ore is formed in (467.1±2.2)-(465.0±3.7) Ma which belongs to the Middle Ordovician.There for,Huangyakou lead-zinc deposit was formed earlier than Baiyin copper polymetallic ore.It is proposed that Baiyin copper polymetallic orefield and its periphery are multi-stage metallogenic, which has some implications in the prospecting of the Baiyin orefield.

       

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