摘要
本文根据比较沉积学的原则,研究了河北阳原县22个泥河湾层的剖面的沉积结构,参考粒度分析及介形虫的古生态资料,确定了泥河层的沉积环境演变.平面上划分三个沉积系列,垂向上划分出12个沉积相模式.
Based on the principles of comparative sedimentography, this paper has expounded structures of Nihewan Formation in total 22 sections from Yangyuan County of Hebei Province; referring to the results of grain size analysis and the informations of ostracoda palaeoecology, the author has determined the changes of sedimentary environments of Nihewan Formation.
The Yangyuan basin is a fault one, in which the sedimentary 'environments are controlled stringently by the geotectonic framework.
The sedimentary system of Nihewan Formation can be subdivided into three parts: alluvial fan, meandering river and lake basins. The sedimentary facies of Nihewan Formation can be subdivided into 12 subfacies, namely, mud-rock flow, shallow network river course, sand flat, lake delta, meandering course, flood bed, natural levee, splay, fluviatile lake, by-water, shallow lake and lakeside.
The Sedimentary sequence of Nihewan Formation can be subdivided into five stages and they have isime characteristics. Division of strata by making use of lake change patterns is feasible. This sedimentary sequence is controlled by tectonic movements and climatic changes.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1989年第1期85-92,共8页
Marine Geology & Quaternary Geology
