摘要
巢湖北部地区位于扬子板块北东边界,西邻华北板块,且与郯庐断裂带相交汇,特殊的地理位置使得巢湖北部地区发育有特殊的地质构造——M型的“两向一背”式褶皱。通过对巢湖北部构造变形特征的研究分析,表明该地区现阶段褶皱的变形特征主要是由印支运动挤压和燕山运动的叠加改造而形成的;通过进行物理模拟实验,根据相似度准则采用与实际情况相近的材料,实验真实还原出巢湖北部地区构造的形成过程。该地区演化主要受中生代运动的影响,印支运动时期古太平洋板块向扬子板块俯冲,使扬子板块与华北板块挤压,产生了北西西-南东东向的挤压力,从而形成了巢湖北部两个向斜夹一个背斜的整体构造格局;后期在燕山运动作用下,南北向挤压对该地区的褶皱变形进行叠加,对印支运动形成的构造进行了改造,使得现今巢北地区的断层发育。
The northern Chaohu area is located in the northeast boundary of the Yangtze Plate,borders on the North China Plate in the west,and crosses the Tan-Lu fault zone.Due to its special geographical location,it is developed with a specific geological structure,i.e.,a fold with two synclines holding one anticline in the form of“M”.Analysis of the features of structural deformation in the area indicates that the deformation is resulted primarily from the compression of the Indosinian Movement and later reworking by the Yanshanian Movement.According to the similarity criterion,the formation process of the structure in the northern Chaohu area was reconstructed by using materials similar to those in the actual situation.The evolution of the area was mainly affected by the Mesozoic movement.During the Indosinian Movement,the ancient Pacific plate subducted under the Yangtze plate,and caused the compression between the Yangtze plate and the North China Plate in the NWW-SEE direction,and thus formed the overall structural framework of two synclines holding one anticline in the northern Chaohu area.Later,the Yanshanian Movement led to the north-south compression,which was superimposed on the folding deformation in the area,and reformed the structures that had already been formed by the Indosinian Movement,as a result,faults are developed in the northern Chaohu area nowadays.
作者
刘柯
宋立军
刘学锋
LIU Ke;SONG Li-jun;LIU Xue-feng(School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China)
出处
《安徽地质》
2022年第1期12-14,79,共4页
Geology of Anhui
基金
国家级大学生创新训练项目(编号:201910705017)资助。
关键词
巢湖北部
构造物理模拟实验
构造演化
northern Chaohu area
physical simulation test of structures
structural evolution
