Late Mesozoic Extension Structures on the North China Craton and Adjacent Regions and Its Geodynamics
详细信息
- 责任者：Lin Wei (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Wang Jun
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(5)
- 关键词：伸展构造 ; extension tectonics ; 动力学 ; dynamics ; 华北地区 ; North China
- 页码：p.1791-1810
- 图表：illus., 155 refs.
- 分类号：0300
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Late Mesozoic extension tectonics was quite significant on eastern Eurasia Continent and it was expressed by extensional domal structure such as the metamorphic core complexes,syntectonic plutons,and ductile detachment fault,even graben and half graben basins. According to our field observations,laboratory work and previous research,from north to south,five extension belts have been separated: Transbaikalia-Okhotsk belt,western part of North China Block,eastern part of North China Block,south margin of North China Block and Qinling-Dabie belt and South China Block. As a largest extension tectonic at the scale of crust in the world, these entire belts have NW-SE extensional direction and this extensional structure make the middle to lower curst rocks exhumed to the surface along the detachment normal fault. Geochronological work on these ductile detachment fault indicated a very narrow period around 130 ～ 126Ma except the eastern part of North China Block,which have a width extensional period relatively. Lithosphere delamination could be considered as the geodynamic of this large scale extension tectonic. This geodynamic model could make us to understand the time,scale,and mechanism on the topic of North China Craton destruction from the view of structure analyses.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |