Science in China Series D: Earth Sciences

, Volume 51, Supplement 2, pp 32–43

Multi-level decollement zones and detachment deformation of Longmenshan thrust belt, Sichuan Basin, southwest China

Authors

    • State Key Laboratory of Petroleum Resource and ProspectingChina University of Petroleum
    • Key Laboratory for Hydrocarbon Accumulation MechanismChina University of Petroleum, Ministry of Education
    • Basin and Reservoir Research CenterChina University of Petroleum
  • KeMing Yang
    • Southwest Division CompanySINOPEC
  • WenZheng Jin
    • State Key Laboratory of Petroleum Resource and ProspectingChina University of Petroleum
    • Key Laboratory for Hydrocarbon Accumulation MechanismChina University of Petroleum, Ministry of Education
    • Basin and Reservoir Research CenterChina University of Petroleum
  • ZhiZhou Lü
    • Southwest Division CompanySINOPEC
  • YiXin Yu
    • State Key Laboratory of Petroleum Resource and ProspectingChina University of Petroleum
    • Key Laboratory for Hydrocarbon Accumulation MechanismChina University of Petroleum, Ministry of Education
    • Basin and Reservoir Research CenterChina University of Petroleum
Article

DOI: 10.1007/s11430-008-6014-9

Cite this article as:
Tang, L., Yang, K., Jin, W. et al. Sci. China Ser. D-Earth Sci. (2008) 51: 32. doi:10.1007/s11430-008-6014-9

Abstract

As is well known that many decollement layers were developed in the Longmenshan thrust belt, Sichuan Basin, China. Through field investigation, explanation of seismic profiles and analysis of the balanced sections, we can divide the decollement zones into 3 categories: (1) the deep level decollement zones, including the crust-mantle decollement layer, intracrustal decollement layer, and presinian basal decollement layer. The main structural styles of their deformation are the crust-mantle decoupling detachment deformation, the basal ductile shear deformation, etc.; (2) the middle level decollement zones, including the Cambrian-Ordovician decollement layer, the Silurian decollement layer, etc., the main structural styles of their deformation are the isopachous fold, the angular fold, the saddle structure, and the combination styles of them; and (3) the shallow level decollement zones, including the Xujiahe Formation decollement layer of Upper Triassic and the Jurassic decollement layers, the main structural styles of their deformation are the thrust-nappe tectonic, the pop-up, the triangle zone, the duplex, etc. Multi-level decollement zones not only made the Longmenshan thrust belt develop many different deformation styles from deep place to shallow place, but also made some local areas have the superimposition of the tectonic deformation apparently. This study indicates that the multi-level decollement zones have a very important effect on the shaping and evolution of the Longmenshan thrust belt.

Keywords

decollement layerstructural stylesmulti-level decollement zonesLongmenshan thrust belt

Copyright information

© Science in China Press and Springer-Verlag GmbH 2008