中国南方海相震旦系-中三叠统层序划分与对比

在对中国南方不同地区海相震旦系-中三叠统基干剖面和辅助剖面详细观测研究的基础上,对震旦系-中三叠统进行了系统的层序划分对比,共识别出13个超层序和99个三级层序,讨论了13个超层序的特征,建立了中国南方海相震旦系-中三叠统的层序格架.总体上看各超层序在整个中国南方不同盆地、不同相带的剖面上可以完全对比,但同一个超层序内所包含的三级层序个数及完整性有所不同.对于三级沉积层序来说,半数以上可以得到化石带较为准确的年代控制并在同一个构造分区甚至整个中国南方进行对比,部分层序甚至还可以在三级层序的体系域层次进行对比.表明从整个中国南方来看二级相对海平面升降变化更具有一致性,而三级相对海平面的变化规律在不同盆地、不同相带有所差异.

DIVISION AND CORRELATION OF THE SEQUENCES OF MARINE SINIAN SYSTEM TO MIDDLE TRIASSIC SERIES IN THE SOUTH OF CHINA

There are 13 supersequences and 99 sequences identified and divided in Sinian system to Middle Triassic Series in the south of China by using quantitative analysis of field geologic sections, and the features of every supersequence are discussed briefly and correlated. In general, there is good correlation of every supersequence in different basins and facies belts in the south of China, but sequences included in the supersequence can not be correlated entirely. This indicates that the change of the second relative sea level is uniformity in the south of China, but the third relative sea level change is different in different basins and facies belts.