河南嵩山区前寒武纪构造形变史及古构造型式

绪言本文工作范围为以河南省嵩山为中心的800平方公里面积(图2,5),位于秦岭巨型纬向构造带上,东西向登封大背斜的核部及北翼。区内出露了由三个角度不整合相隔的三套前寒武纪岩系(图1),为我国前寒武系典型发育地区之一。

THE PRECAMBRIAN DEFORMATION HISTORY AND PALEO-STRUCTURAL TYPES OF THE SONGSHAN AREA, CHINA

A detailed study has been made on the deformation history and paleo-structural types of the three Precambrian Groups in the Songshan area, Henan Province, China. It has revealed that the structure of the late Precambrian Wufoshan Group delineates an arcuate belt, belonging to the latitudinal tectonic system and displays features of gliding tectonics. At least two widespread episodes of deformation can be recognized in the Songshan Group. The folds of the first generation constitute a nearly N-S trending folded belt, while the second generation folds, which are superimposed upon the former, trend NNE-SSW to NB-SW. These two acts of deformation have also influenced and reformed the rocks of the underlying Dengfeng’ Group, producing two generation of folds, which together with the structures formed by the Songshan Movement impose an intricate interference pattern on the Archean metamorphic complex.