摘要
鄂西北江北地区上元古代耀岭河群内,韧—脆性剪切带发育,剪切指向表明韧—脆性剪切带的运动方式在早期以 NW(W)向左行剪切为主,逐渐转化为 NW(W)向右行剪切,晚期为自北向南的逆冲运动。通过分析,证实该剪切带为简单剪切机制下的产物。变形环境相当于区域低温动力变质作用中的中高压蓝闪绿片岩相。推测其形成时代可能属印支期。
The ductile-brittle shear zone is well developed in Yaolinghe Group of the Upper Pro- terozoic in north side of Hanjiang River,Northwest Hubei Province.The shear movement is sinistral along NW(W)direction at first,then dextral along NW(W)and overthrust from north toward south in the end.According to qualitative and quantitative analyses,it is proved that the shear zone is formed by simple shear mechanism.The deformation happened at low -temperature,regional dynamometamorphism of moderate-high pressure glaueophane- greenschist facies.Its formation age is about Indosinian.
基金
为地矿部"八五"期间秦巴重点科技攻关项目二级课题部分内容阶段性成果之一。课题编号:85-01-018-08
关键词
耀岭河群
韧—脆性剪切带
变形机制
Yaolinghe Group
Ductile-brittle shear zone
Mechanism of deformation
