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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

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段忠志, 何世平, 计波, 时超, 王立轩, 魏小燕. 2021. 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. 西北地质, 54(2): 30-42. doi: 10.19751/j.cnki.61-1149/p.2021.02.003
引用本文: 段忠志, 何世平, 计波, 时超, 王立轩, 魏小燕. 2021. 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. 西北地质, 54(2): 30-42. doi: 10.19751/j.cnki.61-1149/p.2021.02.003
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DUAN Zhongzhi, HE Shiping, JI Bo, SHI Chao, WANG Lixuan, WEI Xiaoyan. 2021. Zircon U-Pb Age of the Meta-rhyolite of Huangyakou Lead-zinc Deposit and Its Geological Significance in Yuzhong County, Gansu Province. Northwestern Geology, 54(2): 30-42. doi: 10.19751/j.cnki.61-1149/p.2021.02.003
Citation: DUAN Zhongzhi, HE Shiping, JI Bo, SHI Chao, WANG Lixuan, WEI Xiaoyan. 2021. Zircon U-Pb Age of the Meta-rhyolite of Huangyakou Lead-zinc Deposit and Its Geological Significance in Yuzhong County, Gansu Province. Northwestern Geology, 54(2): 30-42. doi: 10.19751/j.cnki.61-1149/p.2021.02.003
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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

  • 1. 中国地质科学院, 北京 100037;

  • 2. 中国地质大学(北京), 北京 100083;

  • 3. 中国地质调查局西安地质调查中心, 陕西 西安 710054

  • 基金项目:

    中国地质调查局“商丹—大柴旦地区区域地质调查”（DD20190069）二级项目下设“甘肃白银一带J48E021008、J48E022009、I48E022010三幅专项地质调查”子项目。

详细信息
    作者简介: 段忠志(1995-),男,地质工程专业硕士研究生。E-mail:cutecatekk@163.com。
    通讯作者: 何世平(1963-),男,研究员。E-mail:xakeyi@163.com。

  • 中图分类号: P62;P597.3

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

  • 1. Chinese Academy of Geological Sciences, Beijing 100037, China;

  • 2. China University of Geoscience(Beijing), Beijing 100083, China;

  • 3. Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, Shaanxi, China

More Information

    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。
    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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