恒山中东部灰色片麻岩剪切变形初探  

Shearing deformation of gray gneisses in the east-central part of Hengshan Mountain,Shanxi,China

作　　者：李好斌[1] 温长顺[1] 杨俊才[2] 

机构地区：[1]中国地质大学地球科学与资源学院 [2]山西省地质调查院,山西晋中030600

出　　处：《地质通报》2007年第2期190-199,共10页Geological Bulletin of China

基　　金：山西恒山王庄堡测区(1992);荆庄测区(1994)等1:5万区域地质调查项目部分成果。

摘　　要：恒山高级变质岩区是中国早前寒武纪变质岩研究的经典地区之一。通过对区内露头尺度的构造研究,识别出恒山灰色片麻岩在新太古代晚期发生了2期剪切变形,2期剪切变形形成的构造形迹在空间分布、岩石的变形习性、变形组构等方面均存在差异。重点分析了早期构造变形形成的各种构造形迹的特点,认为恒山中东部的灰色片麻岩早期形成的自北而南由网结状分布的强变形带向均匀带状展布的强变形带的变化是构造变形分解的结果,代表了岩石在中深构造层递进变形的过程,具有时空演变的意义。这一过程是由均匀的岩石、各向异性不均匀的岩石向强烈定向的岩石转变的过程。The Hengshan high-grade metamorphic terrain is one of the typical areas for the study of Early Precambrian metamorphic rocks in China. Through outcrop-scale tectonic analysis of the area, two stages of Late Neoarchean sheafing deformation of the Hengshan gray gneisses have been recognized. The tectonic features formed in the two stages of shearing deformation show differences in their spatial distribution and deformation behaviors and fabrics of rocks. The focus of the paper is on the tectonic features formed in the early-stage tectonic deformation. It is thought that the early-stage change of the Hengshan gray gneisses fi：om the nonuniform netted strong shearing deformation zone to uniform striped strong shearing deformation zone from north to south is the result of structural deformation decomposition, which represents a process of progressive deformation of rocks at the mid-deep tectonic levels and has the significance of temporal-spatial evolution. This process is one of transition from uniform rocks and anisotropic, nonuniform rocks to strongly oriented rocks.

关 键 词：恒山 灰色片麻岩 剪切变形 条带构造 旋转斑体 

分 类 号：P588.345[天文地球—岩石学]