Formation Epoch and Origin of the Yizhang Sndesite, Diabase and Granite-Porphyry in Yizhang County, Southern Hu’nan Province: Zircon U-Pb Age and Hf Isotopes
详细信息
- 责任者：Liu Yong (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Li Tingdong
- 刊名：Geological Bulletin of China
- 出版年：2012
- 卷期：31(9)
- 关键词：辉绿岩 ; diabase ; 花岗斑岩 ; granite porphyry ; 安山岩 ; andesite ; 铀—铅计时 ; U-Pb dating ; 湖南 ; Hunan Province
- 页码：p.1363-1378
- 图表：7 illus., 4 tables, 42 refs.
- 分类号：0801
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
Early Yanshanian（Jurassic） rock masses dominated by andesite, diabase and granite-porphyry are widely exposed in Yizhang County, Hunan Province. However, the formation age and petrogenesis of these rock masses remain controversial. Based on several age data of inherited zircons from granites in the neighboring Nanling Range, it can be concluded that the granitites were produced mainly by remelting of the Mesoproterozoic basement rocks. They were probably derived from partial melting of the Proterozoic igneous protoliths with minor addition of the juvenile crust or newly mantle-derived magmas, accompanied by assimilation and fractional crystallization.