Geochemistry and Petrogenesis of the Indosinian Dashenshan Granite, Western Hunan Province , South China
详细信息
- 责任者：Zhang Longsheng (Key Laboratory of Non-Ferrous Metals Metallogenic Prediction ; Ministry of Education ; School of Geosciences and Info-Physics ; Central South University ; Changsha 410083 ; China) ; Peng Jiantang
- 刊名：Geotectonica et Metallogenia
- 出版年：2012
- 卷期：36(1)
- 关键词：I型花岗岩 ; I-type granite ; 岩石学 ; petrology ; 岩石地球化学 ; lithogeochemistry ; 湖南 ; Hunan Province
- 页码：p.137-148
- 图表：12 illus., 3 tables, 47 refs.
- 分类号：0801
- issnNo：ISSN1001-1552
- isbnNo：CN44-1595/P
摘要
The Darongxi tungsten deposit in western Hunan Province is spatially and genetically related to the Dashenshan granite, which consists mainly of biotite monzonitic granite. The geochemical data reveal that the Dashenshan granite emplaced during the late stage of post-collision between the Yangtze and the Cathysia blocks, and belongs to I-type granite. The collision between Yangtze and Cathysia blocks and subsequently intra-continental subduction resulted in the over thickened lithosphere, and thus caused the lithospheric delamination and upper mantle upwelling in the Xuefengshan region, western Hunan Province. The underplating mantle magma led to the melt of the lower crust in the studied area, and produced a mantle-crust mixing magma which seems to be mainly derived from the partial melting of lower crustal materials rather than upper mantle. Thus, the mantle-crust mixing magma gradually evolved and finally formed Dashenshan granite.