Geochemistry and Tectonic Setting of the Jiarongjiandegongka Intrusive Rocks in Qumarleb , Qinghai
详细信息
- 责任者：Bai Yunshan (Wuhan Center ; China Geological Survey ; Wuhan 430205 ; China) ; Niu Zhijun
- 刊名：Sedimentary Geology and Tethyan Geology
- 出版年：2011
- 卷期：31(3)
- 关键词：侵入体 ; intrusions ; 构造环境 ; tectonic setting ; 青海 ; Qinghai Province
- 页码：p.88-94
- 图表：8 illus., 6 tables, 6 refs.
- 分类号：0801
- issnNo：ISSN1009-3850
- isbnNo：CN51-1593/P
摘要
The intrusive sequences in Jiarongjiandegongka, Qinghai Province consist of quartz diorite, tonalite, granodiorite and syenogranite. The lithochemical compositions display the evolution from intermediate, basic to acidic rocks, and the magmas are rich in silica and alkali. The geochemical signatures are characterized by the enrichment of LREE, enrichment of large ion lithophile elements such as Rb, K, Ba and Th, slight depletion of Sr, Nb and Ta, and strongly depletion of Ti and P. The tectonic setting of the Jiarongjiandegongka intrusive rocks are assigned to syn-collision granites, and may be traced back to Early Cretaceous.