高校地质学报2026，Vol.32Issue(4)：471-487,17.DOI:10.16108/j.issn1006-7493.2025043
川西高原南缘构造磁组构及其有限应变分析
Tectonic Magnetic Fabric Characteristics and Finite Strain Analysis of Southern Margin of the Western Sichuan Plateau
摘要
Abstract
Through anisotropy of magnetic susceptibility(AMS)analysis,it is investigated that the superposed structural characteristics and tectonic evolution of the southern margin of the Western Sichuan Plateau,including the Longmen Shan Fault Zone,the Songpan-Ganzi Block,and portions of the Qiangtang Block.The findings offer new constraints on the strain patterns and tectonic history of the study area.Focusing on the Triassic Xikang Group strata,six distinct types of magnetic fabrics were identified across 87 sampling sites,representing progressively increasing deformation intensity.These magnetic fabric types include:sedimentary fabric,incipient deformation fabric,pencil fabric,weak foliation fabric,strong foliation fabric,and stretching lineation fabric.Notably,the incipient deformation fabric is quantitatively dominant.Furthermore,a significant proportion of the magnetic fabrics exhibit superimposed characteristics,recording the overprinting of tectonic stresses and revealing two major phases of tectonic deformation:Late Triassic and Cenozoic.The magnetic fabrics record Late Triassic deformation characterized by widespread NE-SW oriented tectonic shortening(compression).Additionally,along the eastern margin of the Songpan-Garzê Terrane,this shortening exhibits a gradual decrease in intensity from SE to NW.The Cenozoic deformation recorded by the magnetic fabrics is superimposed upon the pre-existing Late Triassic fabrics and is primarily controlled by Cenozoic fault-related shear deformation.Regionally,the Late Triassic deformation is pervasive,displaying marked characteristics of penetrative deformation.In contrast,the Cenozoic deformation is predominantly localized around major fault zones,exhibiting a non-penetrative deformation pattern at the regional scale.关键词
川西高原/磁组构/构造叠加/松潘—甘孜地块/有限应变Key words
West Sichuan Plateau/magnetic fabric(AMS)/superimposed deformation/Songpan-Garzê Block/finite strain分类
天文与地球科学引用本文复制引用
张家恺,贾东,钟城,张勇,李玮..川西高原南缘构造磁组构及其有限应变分析[J].高校地质学报,2026,32(4):471-487,17.基金项目
国家自然科学基金联合基金项目(U22B6002) （U22B6002）
国家自然科学基金项目(42171001 （）
41972219 （）
41572187)联合资助 （）
