LA-ICP-MS Zircon U-Pb Age of the Halihadeshan Granite-Gneiss in Northeastern Dulan , Qinghai Province
详细信息
- 责任者：Xu Yaling (Faculty of Earth Sciences ; China University of Geosciences ; Wuhan 430074 ; China) ; Ba Jin
- 刊名：Geological Bulletin of China
- 出版年：2011
- 卷期：30(7)
- 关键词：花岗质片麻岩 ; granitic gneiss ; 铀—铅计时 ; U-Pb dating ; 青海 ; Qinghai Province
- 页码：p.1037-1042
- 图表：3 illus., 1 table, 16 refs.
- 分类号：0802
- 出版序号：1684
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
The Halihadeshan granite-gneiss in northeastern Dulan County of Qinghai Province has a protolith of S-type granites. LA-ICP-MS dating of 20 grains of zircon from this gneiss show that the protolith magma was composed of Mesoproterozoic and Neoproterozoic materials, and that the protolith magma was emplaced and crystallized at ~950 Ma. The correct judgment as to whether the metamorphic wall rocks of the Halihadeshan granite-gneiss belong to Dakendaban Group of Quanji massif seems to be the key to understanding the tectonic evolution relationship between the Quanji massif and Qaidam block in Neoproterozoic period.