蛟河地区前进岩体锆石U-Pb年龄及其与吉中-延边地区钼矿成矿作用的关系

Qianjin rock body zircon U-Pb ages of Jiaohe region to the molybdenum mineralization of central part of Jilin Province-Yanbian region

通过系统翔实的野外地质调查,对吉林蛟河地区前人划分的前进岩体进行了详细研究,结合岩石学、岩石化学等特征,确定该岩体岩石类型为中粒-中细粒二长花岗岩。采用LA-ICPMS锆石U-Pb方法获取该岩体二长花岗岩的侵位年龄为(205±5.0)Ma,与吉林大学孙德有教授做三道河碱长花岗岩岩体同位素年龄(216±3)Ma基本相当;同时作者详细研究了吉中-敦化地区钼矿成矿作用,确定该期花岗岩与钼矿成矿作用无关。

Though detailed,systematic geological survey in filed,detailed studied the Qianjin rock body of the previous division of Jilin Jiaohe region,combined with petrological,lithogeochemical characteristics to determine the rock type（medium-grained-fine adamellite）.Using LA-ICPMS zircon U-Pb method to get the adamellite emplacement age of 205 ± 5.0Ma,being roughly equal to Jilin University Professor Sun De-you Sandaohe alkali-feldspar granite isotopic age（216 ± 3Ma）;meanwhile,the authors detailed studied molybdenum mineralization of central part of Jilin Province-Yanbian region,and determined that the granites and molybdenum mineralization have nothing to do.