摘要：Jura-type folds are well-developed in the eastern Sichuan fold-thrust belt, which are separated into two areas with different structural styles by the northeast-trending Qiyueshan fault, ejective folds to the northwest and trough-like folds to the southeast. The tectonic deformation of the Mesozoic intra-continental structural belt is progressive from southeast to northwest and controlled by multiple detachment layers which are the basement decollement horizon, lower-Cambrian shale, Silurian shale and Triassic gypsum-rock, respectively. However, there is still much controversy about the formation mechanism of the eastern Sichuan fold belt and its overall and segmentation formation time. Based on tectonic physical simulation, we reproduced the formation of the Jura-type folds in eastern Sichuan and analyzed the influence of pre-existing fault and fault dips on the tectonic deformation of the eastern Sichuan fold belt. The simulation results show that the eastern Sichuan fold belt is the product of fault-related folding caused by tectonic extrusion in the step system composed of Qiyueshan fault, Huayingshan fault, basement decollement horizon and Silurian detachment layer. The basement decollement horizon (depth of ~16 km) results in trough-like folds, while the Silurian shale leads to ejective folds. The structural shortening rate of Mesozoic (about 165-75 Ma) in eastern Sichuan is about 32%. The Qiyueshan fault is an important hinge for the transition from trough-like folds to ejective folds, and is the product of migration of the shallow part of this high-angle fault to the northwest. The steep-dipping Huayingshan fault determines the wavelength of folds, favoring the development of typical ejective folds.
© 2019, Editorial Department of Earth Science. All right reserved.

ISSN号：1000-2383

卷、期、页：v 44,n 3,p784-797

发表日期：2019-03-01

期刊分区（SCI为中科院分区）：无

收录情况：EI（工程索引）

发表期刊名称：Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences

参与作者：张建新

通讯作者：王晔

第一作者：邱楠生,常健

论文类型：期刊论文

论文概要：邱楠生,常健,张建新,王晔，Physical Simulation on Development of Multilayer Detachment Fold Belt in Eastern Sichuan，Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences，2019，v 44,n 3,p784-797

论文题目：Physical Simulation on Development of Multilayer Detachment Fold Belt in Eastern Sichuan