Geochemistry and Genesis of Michang Granites and Their Dark Microgranular Enclaves in Guangxi
详细信息
- 责任者：Fu Qiang (China University of Geosciences ; Beijing 100083 ; China) ; Ge Wensheng
- 刊名：Acta Geoscientica Sinica
- 出版年：2011
- 卷期：32(3)
- 关键词：花岗岩 ; granite ; 岩石包体 ; rock inclusions ; 广西 ; Guangxi
- 页码：p.293-303
- 图表：9 illus., 2 tables, 36 refs.
- 分类号：0801
- 出版序号：806
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
///The biotite granite on the southwestern margin of Bobai-Cenxi faulted zone contains abundant mafic magmatic enclaves. The authors systematically studied petrological and geochemical characteristics of the pluton and the enclaves, and have concluded that the Michang pluton and the enclaves belong to meta-aluminous, high-K calc-alkaline rocks. The selected major oxides of MME and biotite granite show a linear correlation in Harker diagrams, and trace elements studies show that they are rich in both large ion lithophile elements and high field strength elements. According to a comprehensive analysis of their tectonic settings as well as petrographical characteristics and geochemical data, it is suggested that the dark microgranular enclaves in Michang pluton were generated by mixing of underplating basic magma and its induced crustal felsic magma in an extension environment.