摘要
1922年葛利普根据我国早期地质工作者的资料和要求,把“震旦系”作为一个时间地层单位古生界的第一个系提出来,而其含义过于笼统而广泛,可以装进大量的、时间范围很长的地层。1924年李四光在长江峡东区确定了一个厚不过800米,时间范围较小的“震旦系”。1934年高振西等在河北蓟县又确定了一个厚达10000米,时间长达10多亿年的大“震旦系”。
There exist a number of problems in the Sinian system research,especially the stratigraphic classification and correlation,which need to be inquired and discussed deeply and repeatedly.The present paper lays emphasis on the argument concerning the scope,the diverse facies,the principle of classification,and the classification and correlation of some representative lithostratigraphic units of the Sinian system.In southern China,Sinian and Cambrian rocks are used to connect closely and transitional sections of which are well presented in several areas.The Sinian system is defined by a sharp unconformity left by the Chinning orogeny at the base.There occurs in it the glacigenous sediments of worldwide significance.And its time range is estimated as ca.300 m.y.So it is favorable for establishing a ehronostratigraphic unit of system rank in the uppermost Preeambrian.
作者
刘鸿允
董榕生
李建林
杨彦均
Liu Hungyun;Li Jianlin;Dong Rongsheng;Yang Yanjun(Institute of Geology,Academia Sinica;Chengdu Institute of Geology;Regional Geologic Survey Team of Hunan Geology Bureaa)
出处
《地质科学》
1980年第4期307-321,共15页
Chinese Journal of Geology(Scientia Geologica Sinica)
