摘要
华北地块北缘中上元古界的白云鄂博群尖山组 ,在白云鄂博群东南花果山一带褶皱变形十分复杂 ,为了研究其褶皱形态、变形机制 ,在原 1∶ 5万填图的基础上选近 1 km2的范围进行1∶ 2 0 0 0大比例尺地质填图 ,以变质长石石英砂岩为标志层 ,确定了两期褶皱构造。综合区域资料表明 :早期 EW向褶皱以纯剪切、纯剪切 +简单剪切为主 ,是加里东运动的结果 ;晚期褶皱表现为 EW向压扁 。
Folding of the middle-upper Proterozoic Jianshan Formation of Baiyunebo Group is very complex in Huaguoshan area of southeast Baiyunebo, northern margin of North China Platform. In order to study the shapes of folds and their deformation mechanism, 1/2000 scale geological mapping has been made in an area of 1 km 2. Two stages of folding have been defined based on distribution of metamorphic feldspathic quartz sandstone. Analysis of regional structural deforming indicates that the early EW-striking folds were formed through pure shear or pure shear with simple shear during the Caledonian Period, and that the late folds were formed under the NW-striking compressional strain during the Indosinian Period.
出处
《华南地质与矿产》
CAS
2003年第1期23-26,共4页
Geology and Mineral Resources of South China
基金
中国地质调查局 1: 2 5万区域地质调查项目( 2 0 0 0 13 0 0 0 0 80 5 1)
关键词
叠加褶皱
动力学
变形机制
白云鄂博群
superimposed folding
dynimics
deformation mechanism
Baiyunebo Group
