济南南部山区的古地震事件岩石学识别

Petrological identification of ancient seismic events in the southern mountain area of Jinan City

通过野外调查、室内鉴定和对比研究,从济南南部下寒武统李官组和朱砂洞组中识别出了一系列由古地震引起的同沉积变形构造,并在一定程度上分析了其形成机理。在朱砂洞组中发育多种震积岩构造,包括卷曲变形、微断层、不协调岩块、震裂隙、震碎角砾及震裂缝充填构造等,李官组中发育震滑塌构造。它们是早寒武世沧浪铺期至龙王庙期的地震事件记录,与大连大林子组及洛南朱砂洞组中的地震记录的地质时代一致。

Based on field survey,lab examination and comparative study,a series of causes for synsedimentary deformational structures of ancient seismic events are identified in Liguan Format and Zhushadong Format in the Lower Cambrian in the southern mountain area of Jinan City.This paper analyzes their formation mechanism to certain degree.There are many seismite structures,including curl deformation,microfault,disordered mass,seismic fissure,seismic breccias and structure by seismic crack filling etc.in the Zhushadong Format.Some seismo-slump structures are developed in Liguan Format.The above mentioned are records of earthquake events in the period from Canglangpu Stage to Longwangmiao Stage of the Early Cambrian,which were consistent with the records of geologic time of seismite structures in Dalinzi Format of Dalian City and seismite ones in Zhushadong Format of Luonan County.