The Determination and Petrogenesis of Early Cretaceous Post-Collision Granitoids in Coqen Tibet
详细信息
- 责任者：Li Xiangyu (College of Earth Sciences ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Ma Runze
- 刊名：Xinjiang Geology
- 出版年：2013
- 卷期：32(1)
- 关键词：黑云母花岗岩 ; biotite granite ; 西藏 ; Tibet
- 页码：p.57-64
- 图表：illus., 3 tables, 30 refs.
- 分类号：0801
- issnNo：ISSN1000-8845
- isbnNo：CN65-1092/P
摘要
Juerquereba granitic pluton located in the north side of the central Gangdese belt,EW distribution of Galiqiong-Juerquereba-Kongnong area.The main rock type is porphyaceous biotite monzogranite.The SHRIMP U-Pb dating results of zircons from granitic are 129 Ma.Which indicates that the Juerquereba granitic pluton were emplaced during the early Cretaceous.The granitoids belongs to high-K calc-alkaline rock series,according to the geochemical characteristics,Sr-Nd isotopic and other characteristics,show that it belongs to the S-type granites.Granitic magma originated in varying degrees of partial remelting of ancient upper crustal material,source material were the clay-rich pelitic rocks.Combine the tectonic discrimination diagrams and regional studies of similar rocks,the era of granites are considered to be of post-collisional type,the formation of the tectonic environment transitioned from the compressional system to the tensional system.In the early Cretaceous,Bangong Co&Nujiang suture zone is between the Lhasa block and Qiangtang block,which already changed from the compressional and uplifting collision stage into stentering post-collision stage.
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