板溪群和莲沱组对比问题与震旦／前震旦界限  

Correlation for Liantuo Formation to Banxi Group and Boundary between the Presinian and the Sinian in Eastern Guizhou

作　　者：林树基 

机构地区：[1]贵州地矿局区调院

出　　处：《贵州地质》1995年第1期23-29,共7页Guizhou Geology

摘　　要：本文讨论了我国地学界长期争论的板溪群与莲沱组对比及有关的震旦／前震旦界限等问题。指出：莲沱组与板溪群不是同时异相，而是上下关系；莲沱组可以和富禄组中下部对比。“大塘坡间冰期”不相当于富禄间冰期，而只相当于富禄间冰期末的一段温暖期；长安冰期不能对比于“古城冰期”，后者只相当于富禄间冰期晚期的一个冰阶段。震旦／前震旦界限不应当置于莲沱组之底，而应在长安组和板溪群及其相当岩群之间。同时提出，在黔桂地区建立我国与国际前寒武划分新案中的Ｃｒｙｏｇｅｎｉａｎ对应的单位层型是完全可能的。For a long time,there has been,in our geological field,the dispute about the correlation of Banxi Group to Liantuo Formation,as well as the boundary between Presinian and Sinian.In this paper, many evidences are given to support the point of view: the Liantuo Formation ought to be a stratigraphic unit overlying Banxi Group rather than a synchronous lithofacies unit different from it,and the Presinian-Sinian boundary should be equivalent to that between Chang'an Formation and Banxi Group,instead of being at the bottem of Liantuo Formation,owing to being correlationable to the mid-lower Fulu Formation, whose interglacial stage covers respectively a glacial epoch relevant to Chang'an ice-stage for the late period and a warm time relevant to Datangpo glacial stage for the end of that interglacial stage,In addition,it is suggested that it is utterly possible to establish in Guizhou-Guangxi region an unit strata-type correspondant to Cryogenian in the new global division chart.

关 键 词：板溪群 莲沱组 震旦代 前震旦代 地层界限 

分 类 号：P534.31[天文地球—古生物学与地层学]