Palaeoproterozoic Tectonic Setting in the Eastern Shandong Province
详细信息
- 责任者：Li Hongkui (Shandong Institute and Laboratory of Geological Sciences ; Ji’nan 250013 ; China) ; Li Yifan
- 刊名：Geological Survey and Research
- 出版年：2013
- 卷期：36(2)
- 关键词：大地构造 ; tectonics ; 山东 ; Shandong Province
- 页码：p.114-122,130
- 图表：4 illus., 29 refs.
- 分类号：0300
- issnNo：ISSN1672-4135
- isbnNo：CN12-1353/P
摘要
The eastern Shandong area is a typical place where the Jingshan group and Fenzishan group(JFG for short) of Palaeoproterozoic formation outcrop,and it is famous for the gigantic reserves of talc,magnesite and graphite deposit.There has been a lot of controversy over the tectonic setting of JFG,with mainly three types of controversial academic view points: rift basin,active continental margin area and subduction-accretionary complex.After synthetical analysis of the above view points,this work discusses the tectonic setting of JFG through its stratigraphic sequence,rock assemblage,deformation,metamorphism,palaeotectonic environment and the changes of structure location and intensity during its evolutionary process.The article concludes that the JFG probably formed in the back-arc basins along continental margin.Both Jingshan group and Fenzishan group are all exposed to the paleoproterozoic collisional orogeny.The former probably formed in back-arc basins environment,with the same characteristics as ancient island arc or back-arc extension.The latter probably formed in back-arc basins subduction-accretionary complex.The high-pressure metamorphic granulite facies rocks of Jingshan group probably resulted from the plate subduction and collision.