摘要
大兴安岭绿林林场一带兴华渡口岩群属于中元古代层状变质岩系 ,受长期热动力变质事件影响 ,形成三个世代褶皱变形构造 ,其中以第二世代褶皱变形为主。此外 ,发育两套大型的韧性剪切带 ,它们在该区构造格架形成过程中起着重要作用。变质与变形作用关系密切 ,由第一世代至第二世代变质表现为角闪岩相的递进变质作用 。
The Xinghuadukou rock group distributes in the Lülin forestry center in the Daxing'anling area, belonging to a middle Proterozoic stratified metamorphic sequences. It experienced a extended thermometamorphism. By means of intensive analysis of the fold structure, three phases of fold deformation have been found out. The second phases of fold is the principal structure. Besides, two major ductile shear zones have been recognized. They played an important role in the formation of the structural framework in the area. The metamorphism is closely related to the deformation. From first phases of fold to second phases of fold deformation, it showed an advancing metamorphism of hornblende facies. Then regressive metamorphism of green schist facies.
出处
《前寒武纪研究进展》
2000年第1期44-50,共7页
Progress in Precambrian Research
基金
国土资源部浅覆盖区 1:2 5万区调填图方法研究课题
关键词
多期褶皱变形
变质变形
兴华渡口岩群
大兴安岭
Xinghuadukou rock group
Polyphase fold deformation
metamorphism and deformation
Daxing'anling
