LA-MC-ICPMS Zircon U-Pb Dating of Wulanwuzhuer Porphyritic Syenite Granite in the Qimantag Mountain of Qinghai
详细信息
- 责任者：Guo Tongzhen (Key Laboratory of Geological Processes and Mineral Resources of Northern Qinghai-Tibetan Plateau ; Qinghai Institute of Geological Survey ; Xining 810012 ; China) ; Liu Rong
- 刊名：Geological Bulletin of China
- 出版年：2011
- 卷期：30(8)
- 关键词：正长花岗岩 ; syenogranite ; 铀—铅计时 ; U-Pb dating ; 青海 ; Qinghai Province
- 页码：p.1203-1211
- 图表：illus., 2 tables, 29 refs.
- 分类号：0801
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
Wulanwuzhuer porphyritic syenite granite in Qimantag region is characterized by high silica, high alkali (AR 3.02-5.88, NK/A 1.04-1.17, and A/CNK 0.96-1.07), high TFeO/MgO ratio, poor CaO and MgO, relatively high ∑REE, slight enrichment of LREE, indistinct light and heavy REE fractionation, negative Eu anomalies, somewhat right-oblique “V”-shaped REE patterns, significant enrichment of Rb, K, Th and other large ion lithophile elements, relative enrichment of Zr, Hf and other high field strength elements, and relative depletion of such elements as Ba, Sr, P, Ti, and Nb. In combination with geochemical and structural features and regional geological setting, the authors hold that the intrusive body was formed in a relative extension environment during post-orogenic or late orogenic evolution.