大兴安岭呼中地区倭勒根岩群变形特征及构造地层单位的建立

Deformation features of the Wolegen Group-complex and establishment of tectonostratigraphic units in the Huzhong area, Da Hinggan Mountains

依据大兴安岭呼中地区中浅变质岩系构造变形特征,对其划分了5个构造岩片,其经历了两期构造变形作用的改造,早期伸展构造改变了原始地层的基本结构,晚期收缩体制下强烈的推覆挤压又造成了构造岩片的移位和叠置,从而使地层广泛非史密斯化。根据不同岩石组合变形特征,划分了8个构造地层类型,在此基础上,结合建造组合特征,建立了构造地层单位—吉祥沟岩组和大网子岩组,两岩组并称为倭勒根岩群。

According to the tectonic deformation features of a medium- and lower-grade metamorphic series in the Huzhong area, Da Hinggan Mountains, five tectonic slices are distinguished. They underwent two phases of tectonic deformation. In the early phase extension changed the basic structure of the original strata. In the late phase, in the contractional regime strong thrusting-compression resulted in displacement and overlapping of tectonic slices and thus made the strata wide non-Smith. According to the deformation features of different rock associations, eight tectonostratigraphic types are recognized. On that basis, combined with the characteristics of rock associations, the authors establish the tectonostratigraphic units-the Jixianggou formation-complex and Dawangzi formation-complex. The two formation-complexes are called the Wolegen Group-complex.