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辽宁柏杖子金矿区中酸性岩浆岩岩石地球化学特征、 锆石U-Pb年代学及其与成矿的关系

  • 鄂建新1,胡博心2,缪广2,屈海浪2,张少远2,解本德3,王成3

  • 作者单位:
  • (1. 贵州锦丰矿业有限公司;2. 中国黄金集团地质有限公司;3. 凌源日兴矿业有限公司)
  • 基金项目:

  • 国家重点研发计划项目(2022YFC2903600);中国黄金集团有限公司地质科研专项基金项目(WKY201702)
  • 详细信息:

  • 作者简介:
  • 鄂建新(1974—),男,高级工程师,从事金铜矿勘查及管理工作;E⁃mail:289847880@qq. com
  • 通讯作者:
  • PDF下载

Lithogeochemical characteristics and zircon U-Pb geochronology of intermediate-acidic magmatic rocks in the Baizhangzi Gold Deposit, Liaoning, and their relationship to mineralization

  • English Author:
  • E Jianxin¹, Hu Boxin², Miao Guang², Qu Hailang², Zhang Shaoyuan², Xie Bende³, Wang Cheng³

  • Unit:
  • (1. Guizhou Jinfeng Mining Co., Ltd.; 2. China Gold Group Geology Co., Ltd.; 3. Lingyuan Rixing Mining Co., Ltd.)
  • 摘要
  • 在线预览
  • 参考文献

摘要:

柏杖子金矿床为产于花岗岩内部张性构造裂隙的石英脉型金矿床。为了判定该矿区中酸性岩浆岩与成矿作用关系,对赋矿围岩柏杖子花岗岩、虎头石花岗岩及苗金沟正长斑岩进行了岩石地球化学和锆石U-Pb年代学的系统研究。定年结果表明,柏杖子花岗岩形成时代为晚三叠世(227.4 Ma±2.7 Ma)。柏杖子花岗岩侵位后,在其南部和西南部分别侵位了虎头石花岗岩(223.6 Ma±2.3 Ma)、苗金沟正长斑岩(221.3 Ma±2.4 Ma)。岩石地球化学特征表明,各类中酸性岩浆岩具有同源特征,但柏杖子花岗岩受强烈的成矿热液作用影响,具有明显的 Th、U元素异常,说明柏杖子花岗岩是该区主要的赋矿岩体,是下一步找矿的重点方向。

关键词:

成岩时代;岩石地球化学;中酸性岩浆岩;柏杖子;金矿床;赋矿岩体;成矿作用

Abstract:

The Baizhangzi Gold Deposit is a quartz vein⁃type gold deposit hosted in tensional structural fractureswithin granite. To clarify the relationship between intermediate-acidic magmatic rocks and mineralization in the area, asystematic study was conducted on the lithogeochemistry and zircon U-Pb geochronology of the ore⁃hosting Baizhangzigranite, the Hutoushi granite, and the Miaojingou syenite porphyry. U-Pb dating results show that the Baizhangzi graniteformed in the Late Triassic(227.4 Ma±2.7 Ma), followed by the intrusion of the Hutoushi granite to its south(223.6 Ma±2.3 Ma)and the Miaojingou syenite porphyry to its southwest(221.3 Ma±2.4 Ma). Lithogeochemical characteristicsindicate that these intermediate-acidic magmatic rocks share a common magmatic source. However, the Baizhangzigranite has been strongly affected by ore⁃forming hydrothermal fluids, exhibiting pronounced Th and U anomalies. Thissuggests that the Baizhangzi granite is the principal ore⁃hosting intrusion in the district and should be prioritized infuture exploration efforts.

Keywords:

petrogenesis age; petrogeochemistry; intermediate-acidic magmatic rocks; Baizhangzi; gold deposit;ore⁃hosting rock mass; mineralization