摘要
以豫西中－新元古界为例，探讨日前露头层序地层学研究中存在的几个重要的问题。认为地层堆积类型转换面及沉积相序向上突然变浅的间断面是层序界面的间接标志。深切谷并非存在于所有的Ⅰ类层序界面，其产生与否主要取决于河流均衡剖面的坡度与暴露的海底地形的坡度差。此外，在露头研究中，副层序应该以沉积相序的演变及海泛而作为划分和鉴别的主要标志。
aking the middle-upper Proterozoic Era in the southern margin of North China Platform as an example, the paper discusses some essential problems about the outcrop sequence stratigraphy in study. The authors hold that the transform surface of stratigraphic accumulation type and disconnected surface of sedimentary facies sequence are indirect marks of sequence boundary. The incised valleys are not always occurred in all sequence boundary of type Ⅰ;their occur rence depends on the slope difference between the slope of fluvial equilibrium profile and the topographic slope of seabottom.In addition,in investigation of outcrops,sedimentary facies sequence and flood surface should be taken as main marks of diagnosis and distinction of parasequences.
出处
《地质科技情报》
CAS
CSCD
北大核心
1995年第2期37-44,共8页
Geological Science and Technology Information
基金
国家科委及地矿部共同资助的国家重大基础研究攀登项目
关键词
露头层序地层
层序界面
沉积相序
地层
元古代
outcrop sequence stratigraphy, sequence boundary, stratigraphic accumulation type,sedimentary facies sequence,parasequence
