Structural Styles of Longmen Mountain Thrust Belt, SW China

• Published in: Journal of earth science (Wuhan, China) Vol. 21; no. 1; pp. 19 - 31
• Main Author: 金文正 汤良杰 杨克明 万桂梅 吕志洲 余一欣
• Format: Journal Article
• Language: English
• Published: China University of Geosciences (Wuhan) China University of Geosciences (Wuhan) 01.02.2010; Springer Nature B.V
• Subjects: Biogeosciences; Earth and Environmental Science; Earth science; Earth Sciences; Fault lines; Geochemistry; Geology; Geosphere; Geotechnical Engineering & Applied Earth Sciences; Mountains; Seismology; Zonation; 中国西南; 冲断带; 断层传播褶皱; 断层相关褶皱; 断层转折褶皱; 构造样式; 逆冲推覆构造带; 龙门山; China; structural style; duplex; zonation; segmentation; stratification; Longmen Mountain thrust belt
• ISSN: 1674-487X; 1867-111X
• DOI: 10.1007/s12583-010-0010-7

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.