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Structural Styles of longmen mountain thrust belt,SW China

Journal of Earth Science 2010年第1期21卷 19-31页

作者：金文正汤良杰杨克明万桂梅吕志洲余一欣 School of Energy Resources China University of Geosciences(Beijing) Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism Ministry of EducationChina University of Geosciences Basin and Reservoir Research Centre China University of Petroleum(Beijing) State Key Laboratory of Petroleum Resource and Prospecting(Beijing) Southwest Division Company SINOPEC

Through field geological investigation and seismic interpretation of the longmen （龙门） mountain thrust belt, we summarized the following structural styles： thrust belt, fault-related fold （fault bend fold, fault propagation fold, and fault decollement fold）, pop-up, triangle zone, duplex, superimposed fold, ductile deformation structures, reverse thrust fault, klippe, decollement structure,etc.. These structural styles have evident distribution characteristics; they had zonation and segmentation in plane. The zonation presents as the thrust nappe tectonic zone to the west of Tongjichang （通济场） fault, fault-related folds between Tongjichang fault and Guankou （关口） fault, and low and mild folds to the east of Guankou fault. The segmentation is evidenced as the scale of reverse thrust faults was minor between Tongjichang No. 1 fault and Tongjichang No. 2 fault. The distance between these two faults became long in the Daynanbao （大园包） structure, and there developed typical fault propagation fold and pop-up between these two faults. Furthermore, the structures had stratifi-cation in profile. The salt layer of T21 provided good conditions for the formation and development of large listric thrust faults; the thrust fault slipped in the salt layer and formed decollement structures and fault-related fold. At the same time, there formed duplex and reverse thrust faults between the two decollement layers.

关键词： longmen mountain thrust belt structural style duplex zonation segmentation stratification.

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Fault Characteristics in longmen mountain thrust belt, Western Sichuan Foreland Basin, China

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Journal of China University of Geosciences 2008年第6期19卷 611-624页

作者：万桂梅汤良杰杨克明金文正吕志洲余一欣 Basin and Reservoir Research Center China University of Petroleum State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Key Laboratory for Hydrocarbon Accumulation Mechanism Ministry of Education Southwest Division Company SINOPEC

Through field geological survey, the authors found that abundant thrust faults developed in the longmen （龙门） mountain thrust belt. These faults can be divided into thrust faults and strike-slip faults according to their formation mechanisms and characteristics. Furthermore, these faults can be graded into primary fault, secondary fault, third-level fault, and fourth-level fault according to their scale and role in the tectonic evolution of longmen mountain thrust belt. Each thrustfault is such as composed of several secondary faults, Qingchuan （青川）-Maowen （茂汶） fault zone is composed of Qiaozhuang （乔庄） fault, Qingxi （青溪） fault, Maowen fault, Ganyanggou （赶羊沟） fault, etc.. The longmen mountain thrust belt experienced early Indosinian movement, Anxian （安县） movement, Yanshan （燕山） movement, and Himalayan movement, and the faults formed gradually from north to south.

关键词： longmen mountain thrust belt characteristics of fault fault grade evolution of fault

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Differential Tectonic Deformation of the longmen mountain thrust belt,Western Sichuan Basin,China

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Acta Geologica Sinica(English Edition) 2009年第1期83卷 158-169页

作者： TANG Liangjie YANG Keming JIN Wenzheng WAN Guimei LüZhizhou YU Yixin State Key Laboratory of Petroleum Resource and Prospecting Beijing 102249 China Key Laboratory for Hydrocarbon Accumulation Mechanism China University of Petroleum Ministry of Education Beijing 102249 China Basin and Reservoir Research Center China University of Petroleum Beijing 102249 China Southwest Branch Company SINOPEC Chengdu Sichuan 610081 China

Field investigation and seismic section explanation showed that the longmen mountain thrust belt has obvious differential deformation： zonation, segmentation and stratification. Zonation means that, from NW to NE, the longmen mountain thrust belt can be divided into the Songpan- Garz~ Tectonic belt, ductile deformation belt, base involved thrust belt, frontal fold-thrust belt, and foreland depression. Segmentation means that it can be divided into five segments from north to south： the northern segment, the Anxian Transfer Zone, the center segment, the Guanxian Transfer Zone and the southern segment. Stratification means that the detachment layers partition the structural styles in profile. The detachment layers in the longmen mountain thrust belt can be classified into three categories： the deep-level detachment layers, including the crust-mantle system detachment layer, intracrustal detachment layer, and Presinian system basal detachment layer; the middle-level detachment layers, including Cambrian-Ordovician detachment layer, Silurian detachment layer, etc.; and shallow-level detachment layers, including Upper Triassic Xujiahe Formation detachment layer and the Jurassic detachment layers. The multi-level detachment layers have a very important effect on the shaping and evolution of longmen mountain thrust belt.

关键词： differential deformation detachment layer segmentation stratification transfer zone,zonation longmen mountain thrust belt

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