Geochronological and Geochemical Studies on Quartz Diorite in Yuximolegai Daban,
详细信息
- 责任者：Niu Hecai (Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Shan Qiang
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(10)
- 关键词：石英闪长岩 ; quartz diorite ; 元素地球化学 ; elements geochemistry ; 铀—铅计时 ; U-Pb dating ; 天山 ; Tianshan Mountains
- 页码：p.2935-2945
- 图表：4 illus., 2 tables, 40 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The relatively less variable major element contents of the quartz diorite from Yuximolegai Daban and their CA/TH index about 1.2 indicated that they should belong to the calc-alkaline series rocks. The quartz diorite might be the co-magmatic rocks with the associated calc-alkaline basaltic andesite of the Dahalajunshan Formation. Both of them are the products of partial melting of the enriched spinel-lherzolite, and their formation was controlled by the fluid derived from the dehydration of the subducting plate. This process of enrichment and metasomatism in primary mantle wedge illustrated the significant characteristics of continental contamination in the quartz diorite of Yuximolegai Daban. So, this quartz diorite occurred in a compressive tectonic setting while the high-K series of volcanic lava in the Dahalajunshan Formation was formed in an extensional tectonic setting induced by the plate-slit.
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