华北地区下古生界沉积相和层序地层分析

SEDIMENTARY FACIES AND SEQUENCE STRATIGRAPHY OF LOWER PALEOZOIC IN NORTH CHINA

运用沉积学和层序地层学研究方法，结合生物地层学，在古地理格局演化和海平面变化分析的基础上，对华北地区下古生界进行沉积相划分和层序地层研究，将下古生界划分为两个超层序和１２个三级层序．各层序主要或基本由海侵体系域及高水位体系域组成．两个超层序最底部的层序为Ⅰ型层序，其顶底界面为Ⅰ类层序界面（ＳＢ１），其余的层序均为Ⅱ型层序。

With the application of depositional system, the method of sequence stratigraphy, and the biostratigraphy theory, division of sedimentary facies and the sequence stratigraphy of the Lower Palaeozoic of North China are studied, on the basis of the evolution of palaeogeography frame and sea level changes. Lower Palaeozoic is divided into two supersequences and 12 third order sequences. The sequences at the bottoms of two supersequences are Type Ⅰ sequence whose top and bottom surface boundary is Type Ⅰ sequence boundary (SB 1) whereas the other sequences are all Type Ⅱ sequences whose top and bottom surface boundary is Type Ⅱ sequence boundary (SB 2). Each sequence is mainly or basically composed of TST (transgression systems tract) and HST (high stand systems tract).