Geochemical, Zircon U-Pb Dating and Hf Isotope Compositions Studies for Tatelekebulake Granite in South Altyn Tagh
详细信息
- 责任者：Cao Yuting (State Key Laboratory of Continental Dynamics ; Department of Geology ; Northwest University ; Xi’an 710069 ; China) ; Liu Liang
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(11)
- 关键词：二长花岗岩 ; monzogranite ; 岩石地球化学 ; lithogeochemistry ; 铀—铅计时 ; U-Pb dating ; 新疆 ; Xinjiang
- 页码：p.3259-3271
- 图表：2 illus., 4 tables, 47 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Geochemical researches indicate that the monzogranite from Washixia area in the South of Altyn Tagh is rich in silica （SiO2=63.62%~72.06%） and alkali （ALK=6.39~7.83）, and is peraluminous. Based on the CL images and the characters of trace element （Th/U >0.1） of zircons, LA-ICP-MS in situ U-Pb dating obtains the age of 462±2Ma should be the formation age of the granite. According to CaO/Na2O-Al2O3/TiO2 and R1-R2 diagram, the granite is formed in original period after collision. Comparing the formation age （462Ma） with the metamorphic ages （~500 Ma） of South Altyn Tagh, the monzogranite from Washixia area in Altyn Tagh is produced in the initial stage of stress relief after collision, when the crustal materials were partial melted due to the lessening of stress.