Structural Deformation in the East Ridge of Huangyuan, Zhoukoudian and Its Geological Significance
详细信息
- 责任者：Xu Teng (School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Ai Yujie
- 刊名：Geoscience
- 出版年：2013
- 卷期：27(2)
- 关键词：构造变形 ; tectonic deformation ; 北京 ; Beijing
- 页码：p.288-293
- 图表：illus., 25 refs.
- 分类号：0300
- issnNo：ISSN1000-8527
- isbnNo：CN11-2035/P
摘要
Detailed analysis of the structural deformation in the Qingbaikouan and Lower Paleozoic erathem in the East Ridge of Huangyuan has not been reported.A recent field observation yields that the oolitic limestone in Zhangxia Formation in the middle of East Ridge occurs repeatedly with its ooides insignificantly deformed,leading to a new detection of thrust faults in Zhangxia Formation.In addition,a small-sized inclined plunging fold,which is composed of the Cambrian Fujunshan Formation and the Qingbaikouan System Jing’eryu Formation outcroping on the excavating face of a quarry in the East Ridge,is characterized by fault contact between one of its limbs and Cambrian Manmao Formation over it.The fault thrust SSW-ward causing the absence of certain strata as well as ductile deformation in wall rocks.These phenomena rectify the previous view of single-stage structural deformation dominated by folds in the East Ridge of Huangyuan,and a new hypothesis of multi-stage deformation starting with folding followed by fault thrusting is put forward.The hypothesis is valuable for a better understanding of the regional structural evolution in West Hills of Beijing.
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