济南南部山区的古地震事件岩石学识别
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摘要
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.
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.
引文
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[2]乔秀夫,李海兵,王思思,等.新疆境内塔拉斯—费尔干纳断裂早侏罗世走滑的古地震证据[J].地质学报,2008,82(6):721-730.
[3]杜远生,韩欣.论震积作用和震积岩[J].地球科学进展,2000,15(4):389-394.
[4]乔秀夫,高林志,彭阳.古郯庐带沧浪铺阶地震事件、层序及构造意义[J].中国科学(D)辑,2001,31(11):911-918.
[5]段吉业,刘鹏举,万传彪.华北燕山中—新元古代震积岩系列及其地震节律[J].地质学报,2002,74(4):441-444.
[6]田洪水,万中杰,王华林.鲁中寒武系馒头组震积岩的发现及初步研究[J].地质论评,2003,49(2):123-131.
[7]田洪水,张增奇,张邦花,等.山东临朐红丝石层中的古地震事件记录[J].中国地质,2006,33(5):1137-1143.
[8]田洪水,李洪奎,王金光,等.沂沭断裂带及其近区的地震成因岩石新认识[J].地球学报,2007,28(5):496-506.
[9]陈一全,连峰,付飞营,等.黄河下游冲积粉土地震液化判别研究[J].山东建筑大学学报,2006,21(6):489-496.
[10]闫臻,杨长春,李继亮,等.鲁西地区馒头组下部滑塌堆积的地质特征及其意义[J].沉积学报,2005,23(1):29-33.
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