Studies on the Geochemistry, Zircon U-Pb Age and Geological Significance of Diabase in the Sepikou Region, Eastern Bogda, Xinjiang
详细信息
- 责任者：Gao Jinggang (Key Laboratory of Western China’s Mineral Resources and Geological Engineering ; Ministry of Education ; College of Earth Science and Resources ; Chang’an University ; Xi’an 710054 ; China) ; Li Wenyuan
- 刊名：Xinjiang Geology
- 出版年：2013
- 卷期：31(2)
- 关键词：辉绿岩 ; diabase ; 铀—铅计时 ; U-Pb dating ; 博格达山 ; Bogeda Mountains
- 页码：p.117-123
- 图表：7 illus., 3 tables, 20 refs.
- 分类号：0801
- issnNo：ISSN1000-8845
- isbnNo：CN65-1092/P
摘要
The Late Carboniferous Diabase in bogda orogenic belt provides important information on the bogda rift tectonic evolution. The geochemistry of the major is characterized by low contents of TiO2 (0.81% ~2.1%), MgO(5.83% ~ 10.48%), K2O and P2O5, high Al2O3 and low K2O /Na2O ration. The above characteristics indicate that magma source are originated from depleted mantle of contamination by crustal materials. Using LA-ICP-MS method of U-Pb age dating, it is the （300.5±1.7） Ma(MSWD=2.3, Th/U =0.36~1.33)that represents the crystallized age of the diabase.It represents the important conversion from compression to extension in Geodynamics.