燕山板内造山带中段近东西向中生代右行走滑构造系统

张长厚; 宋鸿林; 王根厚; 颜丹平; 孙卫华

Volume 26 Issue 5

Sep. 2001

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Article Navigation > Earth Science > 2001 > 26(5): 464-472

Zhang Zhanghou, Song Honglin, Wang Genhou, Yan Danping, Sun Weihua, 2001. MESOZOIC DEXTRAL STRIKE-SLIP STRUCTURAL SYSTEM IN MIDDLE SEGMENT OF INTRAPLATE YANSHAN OROGENIC BELT, NORTHERN CHINA. Earth Science, 26(5): 464-472.

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MESOZOIC DEXTRAL STRIKE-SLIP STRUCTURAL SYSTEM IN MIDDLE SEGMENT OF INTRAPLATE YANSHAN OROGENIC BELT, NORTHERN CHINA

Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2000-10-24
Publish Date: 2001-09-25

Abstract

Abstract

The geometry and inner structures as well as the kinematics of the east-west dextral strike-slip fault system in the middle segment of the intraplate Yanshan orogenic belt are described. The dextral strike-slip fault system is composed of east-west oriented master faults - Gubeikou-Pingquan fault zone and Miyun-Xifengkou fault zone, with the structures between them such as the northeast strike contractional faults and associate folds, northwest oriented extensional faults and dykes as well. The master east-west faults are characterized by subordinate right lateral overstep en echlon faults. While the northwest striking extensional faults and dykes are comparable to "T fractures" expected by Riedel model. The northeast oriented contractional faults and related folds, meanwhile, are the counterparts of compressive structures in Riedel model. The combination of the master faults with the associate northeast fault and folds makes a strike-slip duplex structure. The strike-slip faults formed between later Jurassic and Early Cretaceous. Giving the temporal and spatial relationship among the east-west trending dextral strike-slip fault system and the southeast-ward thrust faulting in the eastern part and the northwestward thrust fault system in the western segment of the Yanshan belt, a unified tectonic model - dextral slip system has been established. This model leads to a renewed interpretation of the tectonic framework and evolution of the Mesozoic-Cenozoic intraplate Yanshan orogenic belt. In this model, the two thrust systems with opposite movement directions in western Liaoning and northwestern Hebei provinces are considered as the result of the compressions in the front of dextral strike-slip plates northeast and southwest of the master fault, respectively. It is reasonable to infer that the tectonic framework of the late Mesozoic intraplate Yanshan orogen is dominated by east-west dextral strike-slip faulting and related deformation. Furthermore, the intraplate Yanshan orogenic belt might be another "extrusion tectonic belt" or "escape tectonics" during the Jura-Cretaceous time in the frame of northeastern Asia. However, a synchronous sinistral strike-slip fault zone north to this belt is needed to prove this interpretation.
- strike-slip fault system,
- strike-slip duplex,
- intraplate orogenic belt,
- Yanshan,
- Hebei Province

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References(31)

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