应用落差分析研究高邮凹陷南断阶主控断层

强烈的构造运动使高邮凹陷南部断阶带主控断层上升盘遭受剥蚀而缺失大套地层,难以用常规方法对其进行研究,而断层落差分析法恰恰能弥补这一不足,从而可以明确断层形成时期及发育历史.对真①、真②’、真②等断层的落差分析表明,真①断层形成于泰州期,阜宁期活动最为强烈;真②’断层形成于戴南初期,并在三垛期强烈活动;真②断层在许庄地区形成于三垛早期,三垛末期强烈活动,而在竹墩地区则形成于戴南末期,三垛期活动强烈.随着三垛运动的结束,南断阶构造活动趋于平静,各主控断层在盐城期相继停止活动.

Study on the control faults in south fault terrace of Gaoyou Sag by fault throw analysis

It is difficult to study the master control faults by routine method,because intense tectonic movements make their up-throw sides be denuded and lack many strata.Through fault fall analysis this difficulty can be solved,and thus the formation time and evolution history of master control faults can be obtained.Some conclusions drawn from the fault throw analysis of Zhen①、Zhen②' and Zhen② faults,are as follows:Zhen① fault forms in Taizhou period and acts intensively in Funing period.Zhen②' fault forms in earlier Dainan period and acts intensively in Sanduo period.Zhen② fault forms in earlier Sanduo period and acts intensively in later Sanduo period in Xuzhuang area,and forms in later Dainan period and acts intensively in Sanduo period in Zhudun area.At the end of Sanduo movement,the structural movement in south terrace becomes quiet again and all the activity of the master control faults stops successively in Yancheng period.