The Magmatic and Genetic Evolution of Early Cretaceous Granitoids in Eastern Guangdong Province
详细信息
- 责任者：Zhao Xilin (Nanjing Institute of Geology and Mineral Resources ; Nanjing 210016 ; China) ; Yu Minggang
- 刊名：Geological Review
- 出版年：2012
- 卷期：58(5)
- 关键词：花岗岩类 ; granitoid ; 广东 ; Guangdong
- 页码：p.965-977
- 图表：6 illus., 3 tables, 27 refs.
- 分类号：0801
- issnNo：ISSN0371-5736
- isbnNo：CN11-1952/P
摘要
Granitoids in the Eastern Guangdong encompass three main rock types： the Dapu biotite-granites, the Dapu bitite-K-spar granites and the Jiexi bitite-K-spar granites. Zircon LA-ICP-MS U-Pb dating of the Dapu biotite-granites and the Jiexi bitite-K-spar granites indicates similar ages of emplacement of (136.3 ± 0.6) Ma and (134.9 ±0.4) Ma, respectively, which belongs to Early Cretaceous but not Late Jurassic. All of these three types of rocks are rich in Si, A1, medium in alkali content, but poor in Fe, Mg, Ca,Ti and P, belong to a high-K calcalkaline series, as well as a weakly peraluminous granite series. The Dapu bitite-K-spar granites and the Jiexi bitite-K-spar granites are coexist closely, forming in the same time, and shows continuous variation trend in geochemistry, have similar isotopic composition, may be formed by partial mehing of Proterozoic pelitic metamorphic sedimentary rocks, are the results of different evolution stage of the same magma.