Origin of the Early Cretaceous Trachyte in Northern Guangdong Province
详细信息
- 责任者：Xiang Yuanxin (School of Earth Sciences ; East China Institute of Science and Technology ; Fuzhou 344000 ; China) ; Wu Jianhua
- 刊名：Geological Journal of China Universities
- 出版年：2011
- 卷期：17(3)
- 关键词：粗面岩 ; trachyte ; 广东 ; Guangdong Province
- 页码：p.436-446
- 图表：8 illus., 1 table, 54 refs.
- 分类号：0801
- 出版序号：224
- issnNo：ISSN1006-7493
- isbnNo：CN32-1440/P
摘要
The trachyte in the Dachangsha basin of the northern Guangdong province was formed in the Early Cretaceous (SHRIMP zircon U-Pb dating shows an age of tracphyte as 135.3±1.5 Ma) . The Sr-Nd-Pb isotopic composition characteristics of tracphyte are discussed. The Sr-Nd, Sr-Pb, Nd-Pb and Pb-Pb relationship of the tracphyte suggests that the trachyte should be originated from partial melting of the young lower crust, while the lower crust should be influenced by metasomatism of fluids from dehydration of subducted upper crust, and there was no upper crust contamination in the process of magma rising.