安丘-莒县断裂与昌邑-大店断裂朱里以北段空间位置及活动性研究

Spatial Location and Activity Research on the North Section of Anqiu-Juxian Fault and Changyi-Dadian Fault From Zhuli

安丘-莒县断裂与昌邑-大店断裂朱里以北段,主要隐伏于第四系之下,少见断裂出露。本项研究根据近年来开展的大量地球物理探测成果,结合野外地质考察、钻探验证以及断层活动资料等的分析对比,阐述了安丘-莒县断裂与昌邑-大店断裂的空间位置和构造特征,并应用区域地震地质、第四纪地质方法和断裂活动的绝对年龄资料对断裂现代活动性进行研究,认为安丘-莒县断裂主要经方家屯村东、文山东坡、石湾店南村西、东冢镇后柳村东、下营等地,属晚更新世活动断裂;昌邑-大店断裂作为郯庐断裂带东地堑的东侧边界断裂,控制潍河东侧的青山、青龙山花岗岩体的西边界,经董家隅村东、下营东,向北大致与安丘莒县断裂平行延伸至莱州湾,属于早中更新世断裂。

The north section of Anqiu-Juxian fault and Changyi-Dadian fault from Zhuli is mostly concealed under the Quaternary system and has little outcrops. On the basis of a large number of geophysical detection results in recent years, combining with the field geological investigation, drilling verification and comparison analysis of fault activity information, this study expounds the location and structure characteristic of the Anqiu-Juxian fault and the Changyi-Dadian fault, studies the modern fracture activity using the method of seismic geology and quaternary geology based on absolute age data. The results show that the Anqiu-Juxian fault mainly cuts across the northern Fangjatun village, eastern slope of Wenshan, western Shiwandian-south village, eastern Houliu village of Dongzhong town and Xiaying village, etc. and is a late Pleistocene active fault. As the eastern boundary faults of the east-graben on the east of the Tanlu fault zone, the Changyi-Dadian fault controls the west boundry of granite rock mass of Qingshan and Qinglongshan in the east side of the Weihe. The Changyi-Dadian fault goes across the east side of Dongjia village, eastern Xiaying and extends to the Laizhou Bay; it is nearly parallel to the Anqiu-Juian fault to northward and is an early Pleistocene fault.