| 吉南早元古代集安群构造解析 |
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| 引用本文： | 胡国巍.吉南早元古代集安群构造解析[J].吉林地质,1994,13(3):39-45. |
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| 作者姓名： | 胡国巍 |
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| 作者单位： | 地质矿产部天津地质矿产研究所 |
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| 摘 要： | 早元古代集安群经历了三期构造变形，分别形成了三个特征各异的构造形迹组合。Ⅰ世代为层理褶皱组合，由平卧褶皱、轴面片理和韧性剪切变形带组成；Ⅱ和Ⅲ世代为片理褶皱组合，分别由各种位态的片理褶皱和轴面褶劈理、膝折面理组成；Ⅰ、Ⅱ世代的原始构造线方位均为近南北向，为近共轴叠加，但因Ⅲ世代构造的强烈改造，现今多变位为东西向。Ⅰ世代构造形迹组合的特征显示集安群的早期构造环境具有构造层次较深、以近水平韧性剪切变形作用为主导的特点。
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| 关 键 词： | 层理褶皱 构造形迹 集安群 地层 早元古代 |
THE STRUCTURAL ANALYSIS OF THE EARLY PRETEROZOIC JI'AN GROUP IN THE SOUTHERN JILIN PROVINCE |
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| Hu Guowei.THE STRUCTURAL ANALYSIS OF THE EARLY PRETEROZOIC JI''AN GROUP IN THE SOUTHERN JILIN PROVINCE[J].Jilin Geology,1994,13(3):39-45. |
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| Authors: | Hu Guowei |
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| Institution: | Tianjin Institute of Geology and Mineral Resources 300170 |
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| Abstract: | The early Proterozoic Ji'an Group underwent three stages of deformation,resulted in formation of three generationts of strcture assemblages with different characteristics. Thefirst generation is called as assemblage of the bedding folds which is composed of the recum-bent folds with axial-plane schastosity and dtictile shear zones.Both of the second and thirdone are named as assemblage of the schistosity folds which is comprised of all kinds of schas -tosity folds,axial-plane crenulation clearage and kink foliations. The first two generations ofthe structure assemblage are nearly palaeo-structure direction of Sotith-North, superimposedwith almost psralleling axis, However,as the strong deformation of the third generation offolds, their strtictural directions have largely been turned to east-west.Characteristics of thelst structure generation show that the earlier tectonic environment of the Ji'an Group is dom-inated by ductile shear deformation with a low angle at pretty lower structural level of thecrusr. |
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| Keywords: | Bedding fold Schistosity fold Palimpsest direction Structural features Generation of structure Schistosity Crenulation cleavage Ductile shear |
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