东天山库姆塔格沙垄东二长花岗岩锆石SHRIMP U-Pb测年

SHRIMP U-Pb dating of zircons from the east Shalong monzogranite in Kumtag, East Tianshan, Xinjiang, China

库姆塔格沙垄东二长花岗岩体由于缺乏同位素年龄依据,其时代厘定一直存在疑问。1∶5万区域地质矿产调查时,对该岩体进行了锆石SHRIMPU-Pb年龄测定,获得了293Ma±6Ma年龄值,表明该岩体形成于晚石炭世。

The age of the east Shalong monzogranite in Kumtag, East Tianshan, Xinjiang, has long been in question because of the lack of isotope age evidence. During 1：50000 regional geological and mineral survey, SHRIMP U-Pb dating was performed on zircons from this intrusion and an age of 293＋6 Ma was obtained. This age suggests that this intrusion formed in the Late Carboniferous.