Main Achievements in Regional Geological and Mineral Prospective Survey of 1∶50 000 in Southern Beitinggong of Gaize County,Tibet
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摘要: 西藏1∶5万改则县北亭贡南部地区地质矿产调查项目取得的主要成果有:①通过采集到的古生物化石依据,新建上三叠统嘎拉弄组,厘定上侏罗统吐卡日组;②通过精准锆石U-Pb测年,得出闪长岩体年龄值为(120±0.7)Ma,下白垩统美日切错组年龄值为(121.9±1.6)Ma,证实早白垩世是测区最为剧烈火山作用时期,与班公湖-怒江洋的俯冲有关。Abstract: The regional geological and mineral prospective survey project of 1∶50 000 in southern Beitinggong of Gaize County,Tibet has achieved main achievements as follows:①A new stratigraphic unit,the Upper Triassic Galanong Formation,was identified,and the Upper Jurassic Karinuo Formation was redefined according to evi-dences of paleontological fossils.② The U-Pb age of zircons from the diorite was (120 ±0.7)Ma,and the age from Lower Cretaceous Meiriqiecuo Formation was (121.9 ±1.6)Ma,which suggested that the Early Cretaceous was the most important period of volcanic activities in the survey area,and the volcanic activities were quite close with the subduction of Bangongco-Nujiang ocean.
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Key words:
- Gaize County /
- Galanong Formation /
- Tukari Formation /
- Meiriqiecuo Formation /
- diorite
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