甘肃阳山金矿带中酸性岩脉成岩年龄与成矿时代

文章研究了阳山金矿带中酸性岩脉侵位时代，探讨了岩脉与金矿成矿的关系，对矿带内不同区段内出露的中酸性岩脉中的锆石进行了SHRIMP U-Pb 年龄测定。结合前人对矿带内岩脉的K-Ar、Rb-Sr法年龄和含金石英脉中锆石SHRIMP U-Pb 年龄的测试成果，以及西秦岭地区的中生代岩浆岩形成时代和金矿成矿年龄统计分析，认为阳山矿带内的中酸性脉岩主要形成于晚三叠世末—早侏罗世，金成矿不仅与这个时期的岩浆活动关系密切，而且受到了白垩纪早期及第三纪早期2次岩浆-热液活动的影响

Zircon SHRIMP U-Pb ages of moderate-acid dykes and ore-forming epochs of Yangshan gold belt in Gansu Province

In order to study the intrusive age of mode-rate-acid dykes and the relationship between magmatic activity and gold mineralization in the Yangshan gold belt, the authors determined zircon SHRIMP U-Pb ages of moderate-acid dykes. Samples were collected from different segments of the ore belt. Based on the K-Ar, Rb-Sr ages of the dykes and zircon SHRIMP U-Pb ages of gold-bearing quartz veins in combination with the statistics of the formation epochs of magmatite in Mesozoic and gold metallogenic ages in West Qinling, the authors have reached the conclusion that moderate-acid dykes in the Yangshan ore belt were mainly formed in late Triassic and early Jurassic, and that gold mineralization had close relationship with magmatic activities in this period and was affected by two times of magmatic-hydrothermal activities in early Cretaceous and early Tertiary.