浙北双溪坞群的构造特征及地质意义

本文在野外地质工作基础上,通过对双溪坞群的岩层对比和构造分析,认为本区的双溪坞群与上覆地层间在构造样式上的存在着较大差异。双溪坞群的章村组和北组具有相似的地质特征,为同一火山放心回的产物。神功运动使早期形成的双溪坞群褶皱造山,开怀 竖线型平臣褶皱构造,并受后期构造的叠加改造,形成轴向北东的叠加褶皱构造格局。

TECTONIC CHARACTERISTICS OF THE SHUANGXIWU GROUP AND ITS GEOLOGICAL SIGNIFICANCE IN NORTHERN ZHEJIANG PROVINCE

Zhangcun region is tectonically located in the west side of the northeast end of the Jiangshao fracture zone, with a series of pre-Sinian formations appearing. For a long time, the tectonics in this region is considered commonly simple.After field exploration and study, the authors draw a conclusion, that, WIth multiplate orogenics acting on this region, the tectonics may be complex. Tile so-call "Zhangcun Formation" and "Beiwu Formation" have many similar characteristics, and may be resulted by volcanic orogeny. The structure and mctamorphism of the "Shuangxiwu Group" are different from that of the "Luojiamen Formation", "IIongchi Formation", etc. All of these indicate that after the "Shuangxiwu Group" was formed, it underwent a strong tectonic orogeny,namely, the "Shengong movement", and a tightly closed linear recumbent or reclined fold with an even axial plane was caused. Afterwards, Zhangcun region has undergone subsequent tectonic movement, and thus formed a superimposed fold.