A Preliminary Research on the Slump Structures in Cambrian System in the Western Hills of Beijing
详细信息
- 责任者：Su Dechen (State Key Laboratory of Continental Tectonics and Dynamics ; Beijing 100037 ; China) ; Sun Aiping
- 刊名：Acta Geologica Sinica
- 出版年：2013
- 卷期：87(8)
- 关键词：滑塌构造 ; slump structure ; 北京 ; Beijing
- 页码：p.1067-1075
- 图表：5 illus., 1 table, 38 refs.
- 分类号：0803
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
The Cambrian system in the Western Hills of Beijing outcropps mainly along the Yongding river valley in the north and along the Dazhihe river valley in the south.Famed for the complete sequence,unique rock types and good exposure,the Western Hills in Beijing has been a key location for the study of Cambrian system in China.However,nearly all the field work and publications have been concentrated on the northern part (along the Yongding river valley),for the convenient transportation.The slump structures are found about 5 m above the boundary between the Zhangxia Formation (Middle Cambrian oolite) and the Gushan Formation (Upper Cambrian) in the southern part of Wetsten Hillsalong a branch of the Dazhihe river valley).The slump is mainly composed of micro folds and faults.Axial planes of these folds are SN-striking.The typically dip gently towards the east.The average dipping angle of the micro-faults is about 10 degrees.The deformation pattern is very similar with that in the Late Pleistocene Lisan Formation near the Dead Sea.Two wedge-shaped features are discovered just below the slump layer.Our preliminary research shows that the direct trigger for the newly discovered slump structures are probably the palaeoearthquake associated with the tilting movement of the North China palaeoplate in the late Cambrian.
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