Geochronology and Geochemistry of the Daolanghuduge A-Type Granite in Inner Mongolia , and Its Geological Significance
详细信息
- 责任者：Xie Hongjing (Key Laboratory of Mineralogy and Metallogeny ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Wu Guang
- 刊名：Acta Petrologica Sinica
- 出版年：2012
- 卷期：28(2)
- 关键词：A型花岗岩 ; A-type granite ; 内蒙古 ; Inner Mongolia
- 页码：p.483-494
- 图表：6 illus., 2 tables, 79 refs.
- 分类号：0801
- 出版序号：20130141
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The K-feldspar granite intrusion from Daolanghuduge, Inner Mongolia, is located in the Bainaimiao arc of the northern margin of the North China Craton (NCC) . The SHRIMP analyses of zircons from the intrusion show that these characteristics resemble A-type granites which originated from the partial melting of felsic crust under high temperature and low pressure conditions and the subsequent fractional crystallization of feldspar, titanite, etc. Combined with regional tectonic evolution, the authors suggest that the K-feldspar granite formed in an intraplate extensional setting.The northern margin of the NCC went through a transitional tectonic regime from compression to extension during Late Mesozoic. Under this tectonic regime, the upwelling asthenosphere provided enhanced heat flux and triggered the partial melting of the overlying felsic crust and then produced the Daolanghuduge K-feldspar granite intrusion.