Zircon SHRIMP U-Pb Dating and Lu-Hf Isotopic Composition for Early Cretaceous Plutonic Rocks in Tengchong Block , Southeastern Tibet
详细信息
- 责任者：Qi Xuexiang (State Key Laboratory of Continental Tectonics and Dynamics ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Zhu Luhua
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(11)
- 关键词：火成岩 ; igneous rocks ; 铀—铅计时 ; U-Pb dating ; 镥同位素 ; lutetium isotopes ; 铪同位素 ; hafnium isotopes ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.3409-3421
- 图表：8 illus., 3 tables, 56 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The Early Cretaceous granodiorite and quartz monzonite are the main types of igneous rocks in Tengchong block. The characteristics of I-type plutonic rocks are shown by the mineral assemblages, and high Na2O and low K2O contents and A/CNK values. Zircon SHRIMP U-Pb dating show the granodiorite and quartz monzonite emplaced at (122±1.3) Ma and (125±1.3) Ma, respectively. The zircon εHf(t) values for granodiorite and quartz monzonite range from -9.6 to -4.8 (average -6.7±0.7) and -7.8 to -4.7 (average -6.3±0.6), with corresponding single-stage model ages ranging from 979 to 1 190 Ma and 975 to 1 113 Ma, respectively.