地质通报2026，Vol.45Issue(4)：708-719,12.DOI:10.12097/gbc.2025.03.041
川西南威远背斜南部多向挤压构造演化过程及其主控因素
The evolutionary process and controlling factors of multi-directional compressional tectonics south of the Weiyuan anticline,SW Sichuan Basin
摘要
Abstract
[Objective]Under the influence of adjacent contractional orogenesis,multiple groups of structures with varying orientations have developed in the southwestern Sichuan Basin,exhibiting complex superimposed deformation characteristics.Clarifying the active stages and genesis mechanisms of different fault systems is crucial for understanding hydrocarbon migration pathways,trap formation,and reconstruction processes.[Methods]Based on 3D seismic reflection data,this investigation selects the region south of the Weiyuan anticline as a case study to conduct detailed structural analysis.The dominant structural styles,evolutionary processes,and controlling factors in this area were then analyzed.[Results]The results indicate that NEE-and NW-trending contractional faults and their associated folds are predominantly developed.Among these,the NEE-trending structure is influenced by detachment layers within the Cambrian,Silurian,and Triassic strata,primarily developing thin-skinned structures and displaying stratified deformation characteristics.The NW-trending structure is mainly controlled by detachment layers within the Silurian and Triassic strata.Integrated growth strata analysis and balanced structural restoration indicate that the NE-trending structure underwent four stages of tectonic shortening:Late Caledonian,Hercynian,Indosinian,and Yanshan-Himalayan periods,whereas the NW-trending structure primarily experienced three stages of deformation:Early-and Middle-Indosinian and Yanshan-Himalayan periods.Deformation related to the NEE-trending structures rapidly propagated to the pinch-out of the Lower Cambrian salt detachment layer during the early stage of tectonic deformation,resulting in the formation of the Ziliujing anticline.However,due to the weakening of late-stage compression,NW-directed propagation was significantly restricted.The NW-trending structure initiated later but,driven by continuous and intense tectonic activity,deformation progressively propagated toward the northeast direction.[Conclusions]Consequently,the present-day complex superimposed deformation pattern in the study area is primarily governed by the spatial distribution of the detachment layers and the timing and magnitude of structural deformation in each direction.关键词
滑脱层/缩短率/多期变形/多向挤压/构造演化/四川盆地Key words
detachments/shortening ratio/multi-stage deformation/multi-directional compression/tectonic evolution/Sichuan Basin分类
天文与地球科学引用本文复制引用
尹超,饶刚,唐鹏程,汪仁富,刘嘉伟,杨文雄,黄旭日..川西南威远背斜南部多向挤压构造演化过程及其主控因素[J].地质通报,2026,45(4):708-719,12.基金项目
国家自然科学基金项目《数值模拟研究褶皱三维生长及其地貌演化》(批准号:42272271)、四川省自然科学基金项目《宜宾地区柏树溪断裂构造分析及其地震风险指示意义》(编号:2022NSFSC0212)、自然资源部深地科学与探测技术实验室开放课题《川南构造叠加区断裂模型构建及其地震指示意义》(编号:SinoProbe Lab 202213) Supported by the National Natural Science Foundation of China(No.42272271),the Natural Science Foundation of Sichuan,China(No.2022NSFSC0212),and the Open Fund of the SinoProbe Laboratory,Chinese Academy of Geological Sciences(No.SinoProbe Lab 202213) （批准号:42272271）
