中国科技核心期刊
美国化学文摘社(CAS)数据库
美国EBSCO学术数据库
日本科学技术振兴机构数据库(JST)
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
E Jianxin¹, Hu Boxin², Miao Guang², Qu Hailang², Zhang Shaoyuan², Xie Bende³, Wang Cheng³
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。
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.