韧性剪切带中两种线理的地质意义  

Geological significance of two lineations in ductile shear zone

作　　者：蒙丽妙 郭尚宇 李立基 MENG Limiao;GUO Shangyu;LI Liji(The Mineral Resources and Reserves Evaluation Center of Guangxi,Nanning 530028,Guangxi,China)

机构地区：[1]广西壮族自治区矿产资源储量评审中心,广西南宁530028

出　　处：《矿产与地质》2024年第2期365-369,共5页Mineral Resources and Geology

基　　金：广西北海市陆域石英砂矿资源潜力评价及成果集成项目(桂自然资函〔2023〕1337号)资助。

摘　　要：韧性剪切带中丰富的变形现象记录剪切变形过程的重要信息,线理是韧性剪切带中常见且重要的观测要素,能够为剪切带的形成及演化提供关键的线索。通过野外工作实测观察,总结2种典型线理(皱纹线理和交面线理)的特征、形成原因及其观测方法,预测韧性剪切带的剪切运动方向。研究表明,为避免由于皱纹线理易与擦痕混淆误判剪切运动方向,应对C面理和垂直于C面理的多个截面进行综合判断。Abundant deformation phenomena in ductile shear zones record important information of shear deformation process.Lineation is a common and important observation element in ductile shear zones,which can provide key clues for the formation and evolution of shear zones.Through field work observation,the characteristics,formation reasons and observation methods of two typical lineations(wrinkle lineation and intersection lineation)are summarized,and the shear movement direction of ductile shear zone is predicted.The research shows that the comprehensive judgment of C-foliation and multiple sections perpendicular to C-foliation should be carried out to avoid the misjudgment of the direction of shear movement due to the confusion of wrinkle line and scratch.

关 键 词：韧性剪切带 皱纹线理 交面线理 

分 类 号：P542[天文地球—构造地质学]