摘要
在华北地台的震旦系与下古生界中的固定层位中,赋存并呈区域性分布着泄水脉灰岩、泥质岩,它们是强地震时,距震中一定距离内未成岩的沉积物经受水平振动时产生的液化泄水构造,是鉴别地层中地震灾变事件的依据。华北地台东部及北部的震旦系和下古生界中可识别出20个震积岩岩组,在地层柱中代表了6个地震活跃期,每个活跃期之间的周期长度为40Ma或30Ma节律,可能有某种具普遍规律性的意义。
A series of micrite water escaped vein limestone and mudstone are formed regionally in some fixed horizons in Sinian and Paleozoic strata of the North China Platform. The micrite water escaped vein limestone possesses liquefaction water escaped structure which is formed in unconsolidated sediments under horizontal movement resulted from strong earthquake within certain distance of an epicenter. The micrite limestone may be used as one of the evidences to identify the seismitic catastrophe events happened in strata. 20 seismitic rock units are distinguished into Sinian and Lower Paleozoic in the eastern and northern parts of the North China Platform. They represent 6 seismitic active periods. The cycle rhythm of each period shows as much 40 Ma or 30 Ma, which is of some important significance.
引文
1宋天锐北京十三陵前寒武纪碳酸盐岩地层中的一套可能的地震海啸序列科学通报,1988,33(8):609~6112吴贤涛,尹国勋四川峨嵋晚侏罗世湖泊沉积岩的发现及其意义沉积学报,1992,10(1):133~1443乔秀夫,宋天锐,高林志,等碳酸盐岩振动液化地震序列地质学报,1994,68(1):16~344梁定益,聂泽同,万晓樵,等试论震积岩及震积不整合———以川西、滇西为例现代地质,1991,5(52):138~1475梁定益,聂泽同,宋志敏扬子西缘东呈伸展运动地球科学,1994,19(4):443~4536梁定益,聂泽同,宋志敏再论震积岩及震积不整合———以川西、滇西地区为例地球科学,1994,19(6):845~8507BalyAW.Geologyofpassivecontinentalmargins.AAPG,1981,(1):1~488乔秀夫,宋天锐,李海兵,高林志辽东半岛南部震旦系—下寒武统成因地层北京:科学出版社,19969乔秀夫,高林志,彭阳,章雨旭内蒙古腮林忽洞群白云鄂博群中的新发现和新认识,地质论评,1997,(2):143~14710李海兵,曾令森,乔秀夫特殊的水塑性构造———地史时期灾变事件(地震)的记录地震地质,1997,(4)