鄂东北大别杂岩中表壳岩系的多期褶皱

基金项目:

国家自然科学基金NSF85040093资助

POLYPHASE FOLDING OF SUPRACRUSTAL SEQUENCES IN THE DABIE COMPLEX IN NORTHEASTERN HUBEI

摘要: 鄂东北大别杂岩中的表壳岩系属于晚太古代层状变质岩系。经详细的褶皱构造解析,识别出四期褶皱变形,主体构造是一大型的RamsayⅡ型叠加褶皱。此外,还识别出二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的作用。该研究成果提供了研究大别杂岩构造学和岩石学的一个窗口。

Abstract: The supracrustal sequences in the Dabie complex in northeastern Hubei belongs to a late Archean stratified metamorphic sequences. By means of intensive analysis of the fold structure,four phases of fold deformation have been recognized. The principal structure is a large-scale Ramsay II-type superimposed fold. Besides, two major ductile shear zones have been recognized. They played an important role in the formation of the structural framework in the area.