Differential Tectonic Deformation of the Longmen Mountain Thrust Belt,Western Sichuan Basin,China  

作　　者：TANG Liangjie YANG Keming JIN Wenzheng WAN Guimei LüZhizhou YU Yixin 

机构地区：[1]State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102249, China [2]Key Laboratory for Hydrocarbon Accumulation Mechanism, China University of Petroleum, Ministry of Education, Beijing 102249, China [3]Basin and Reservoir Research Center, China University of Petroleum, Beijing 102249, China [4]Southwest Branch Company, SINOPEC, Chengdu, Sichuan, 610081, China

出　　处：《Acta Geologica Sinica(English Edition)》2009年第1期158-169,共12页地质学报（英文版）

基　　金：support from:National Natural Science Foundation of China (Grant no.40672143,40472107,40172076);National Major Fundamental Research and Development Project (Grant no.2005CB422107,G1999043305);Development Foundation of Key Laboratory for Hydrocarbon Accumulation of Education Ministry (Grant no.2003-01);Project of Southern Exploration and Development Division Company,SINOPEC (2003-04).

摘　　要：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.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 

分 类 号：P54[天文地球—构造地质学]