成都理工大学学报（自然科学版）2026，Vol.53Issue(1)：1-17,17.DOI:10.12474/cdlgzrkx.2024070801
龙门山褶皱冲断带剥蚀-沉积作用和先存断层结构砂箱物理模拟
Analog experiments of erosion and sedimentation,and the preexisting fault structure in the Longmenshan fold-thrust belt
摘要
Abstract
Fold-thrust foreland basin systems generally undergo a complex shallow tectonic denudation-deposition process that is controlled by factors such as rock stratum distribution and preexisting structure,imparting them with complex three-dimensional spatial structural deformation characteristics and evolutionary processes.In this paper,the Longmenshan fold-thrust belt in the western Sichuan foreland basin system,located on the eastern margin of the Qinghai-Tibet Plateau,is taken as the study object.Based on sandbox analog experiments,an experimental model with preexisting faults and weak rock strata as controlling factors was designed.The structural evolution sequence and subsidence history of different tectonic belts were analysed and discussed.The results show that erosion and sedimentation obviously leads to multistage activation of the boundary faults of the thrust belt,and the area around the preexisting faults is a structurally weak zone.During the compression process,preexisting faults are reactivated to accommodate inversion structures.The existence of a weak detachment layer leads to decollement,which in turn facilitates the formation of diverse inversion structures.The erosion and sedimentation histories of different tectonic belts in the fold thrust belt are significantly different.The hanging wall material of the thrust belt demonstrates a weak buried depth,arising from thrust deformation,and a rapid and continuous burial process occurred during the thrust load process of the foreland basin.The buried structural belt in the frontier of the Longmenshan Mountain has an inverted structural deformation zone that facilitates oil and gas accumulation.关键词
褶皱冲断带/青藏高原东缘/剥蚀-沉积作用/先存断层/反转构造/埋深-沉降史Key words
fold-thrust belt/eastern margin of the Tibetan Plateau/erosion and sedimentation/preexisting fault/inversion structure/subsidence history分类
天文与地球科学引用本文复制引用
邓宾,何泽亮,张小兵,刘恣君,马华灵,胡欣,郭虹兵,张本健,张旋,何宇,涂国煜..龙门山褶皱冲断带剥蚀-沉积作用和先存断层结构砂箱物理模拟[J].成都理工大学学报（自然科学版）,2026,53(1):1-17,17.基金项目
国家自然科学基金(42572160) （42572160）
四川省科技厅创新团队项目(2022JDRC0001). （2022JDRC0001）
