广西桂林地区东部栗木花岗岩体SHRIMP锆石U-Pb年龄

SHRIMP zircon U-Pb age of the Limu granite in eastern Guilin,Guangxi

栗木矿区位于南岭钨锡多金属成矿带的中段,成矿作用与花岗岩密切相关。通过对栗木金竹源与三个黄牛地区云英岩化花岗岩的年代学研究,获得2个SHRIMP锆石U-Pb年龄分别为218.3Ma±2.4Ma和214.0Ma±5.0Ma,代表了栗木花岗岩体的形成年龄。结合前人的研究数据,栗木矿区成岩、成矿作用年龄近乎一致,应为晚三叠世同一期次岩浆作用的产物。

The Limu Sn-Nb-Ta ore deposit located in north Guangxi is an important component part of the Nanling W-Sn polymetallic belt.In this research,zircon SHRIMP U-Pb dating was conducted in Jinzhuyuan and Sangehuangniu area,and the resultant ages are 218.3±2.4Ma and 214.0±5.0Ma,respectively,which represent the formation age of the Limu granite.Combined with the previous research data,it is suggested that the formation of Limu granite and the mineralization occurred almost simultaneously,and that they should be the same magmatic products in Late Triassic.