新疆塔什库尔干县南青白口纪侵入体的发现-来自LA-ICP-MS锆石U-Pb同位素测年的证据

The Discovery of Qingbaikouan Plutonite inT axorgan, Xinjiang,and Evidence from Zircon LA-ICP-MS U-Pb Dating of Intrusive Rock.

1.
China University of Geosciences, Beijing,100083,China Shaanxi Geological Survey, Xi′an,710065,China
2.
China University of Geosciences, Beijing,100083
3.
Xi′an Institute of Geology and Mineral Resources, Xi′an, 710054, China
4.
Xinjiang Bureau of Geology and Mineral Resources, Urumqi 830000,China

摘要: 笔者在新疆塔什库尔干县南进行1∶5万区域地质填图过程中,在前人划分的下古生界地层中解体出一套前寒武系,其中分布有片麻状英云闪长岩。岩石地球化学表明为钙碱性系列,具有火山弧花岗岩特征。两个英云闪长岩体中单颗粒锆石LA-ICP-MS年龄分别为855±14 Ma、836±12Ma,是目前为止喀喇昆仑地区仅有的新元古代岩浆事件年龄。填补了喀喇昆仑地区前寒武纪岩浆事件研究的空白。
- 喀喇昆仑 /
- 新远古代 /
- 英云闪长岩 /
- 锆石U-Pb定年
Abstract: In the period of 1∶50000 field mapping, precambrian strata was distinguished from theLower Paleozoic strata,intruding the Neoproterozoic tonalite pluton. In situ zircon U-Pb LA-ICP-MS dating on the tonalite pluton zircons yielded an age of the 855±14 Ma and 836±12Ma,representing the tonalite pluton intruding age and being the only Neoproterozoic age in Karakorumbelt,which is important in studying of Karakorum Precambrian geological evolution.
- Karakorum /
- Precambrian /
- tonalite /
- zircon LA-ICP-MS U-Pb dating