Late Ordovician Collision and Orogen in Middle Tianshan: Evidences of Geochemical Analyses and Geochronology on Metamorphosed Granitoid Rocks
详细信息
- 责任者：Wang Xingjun (School of Geosciences and Resource ; China University of Geosciences ; Beijing 100083 ; China) ; Wang Genghou
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(7)
- 关键词：变花岗岩 ; apogranite ; 铀—铅计时 ; U-Pb dating ; 天山 ; Tianshan Mountains
- 页码：p.2203-2212
- 图表：8 illus., 2 tables, 41 refs.
- 分类号：0802
- 出版序号：1680
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
A series of metamorphosed and deformed granitoid rocks occurred in Baoertu area, middle Tianshan Mountains of Northwest China. After comprehensive study of petrology, mineralogy and geochemistry, such granitoid rocks are identified as typical calc-alkaline granitoids with following characters: high levels of Hf and Th, lower content of Li , Nb and Ta, the medium REE total, medium negative abnormity of Eu, and V-type REE distribution pattern. It is indicated that the rocks are Caledon-I type and syn-collision granitoids. The results are significant to reveal the tectonic evolution in the area of middle Tianshan, Northwest China.
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