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

Zhu Guoqing, Chen Zijun, Yang Shufeng, Chen Hanlin   

  1. Dept. of Earth sciences, Zheiiang University, Hangzhou, 310027
  • Received:1996-03-20 Revised:1996-03-20 Online:1996-03-20 Published:1996-03-20

Abstract: 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. The so-call“Zhangcun Formation” and “Beiwu Formation”have many similar characteristics, and may be resulted by volcanic orogeny. The structure and metamorphism of tile “Shuangxiwu Group” are different from that of the Luojiamen Formation”, “Hongchi Formation”, etc.. A11 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.