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在对研究区不同相带内典型剖面详细观测、层序界面识别基础上 ,将区内下、中三叠统划分出六个三级层序 ,分别命名为S1 ～S6,其中下三叠统印度阶一个 (S1 )、奥伦尼阶两个 (S2 ～S3) ,中三叠统安尼阶两个 (S4～S5)、拉丁阶一个 (S6) ,从年代地层考虑早三叠延续时限为 3.9Ma ,则S1 、S2 、S3层序延续的时限平均为 1 .3Ma。中三叠统延续的时限为 6.1Ma ,则S4、S5、S6 层序所延续的时限平均分别为 2 .0 3Ma。按层序底面性质可分出 4个Ⅰ型层序 (S2 、S3、S4、S5)和 2个Ⅱ型层序 (S1 、S6) ,并进行了区域层序对比 ,进而建立了区内下、中三叠统层序地层格架模型 ,详细讨论了各层序的次级组成单元 (体系域 )的几何形态和相互关系随时间的迁移所发生的相应变化
Based on the detailed observation of the typical sections and the identification of sequence boundaries in the different facies belts of the study area, the Lower Triassic and the Middle Triassic are divided into six third-order sequences and named as S1 ~ S6 respectively. The Lower Triassic Two of the Indosinian (S2 ~ S3), two of the Middle Triassic Ani (S4 ~ S5) and one Latin (S6) For 3.9Ma, then S1, S2, S3 sequence extension of an average of 1.3Ma. Middle Triassic continuation of the time limit of 6.1Ma, S4, S5, S6 sequence extension of the average time were 2.0 3Ma. According to the bottom of the sequence, four type Ⅰ sequences (S2, S3, S4, S5) and two type Ⅱ sequences (S1, S6) can be distinguished and the regional sequences are compared. , The Middle Triassic sequence stratigraphic framework model, discussed in detail the changes of the geometric shapes and the correlations of the secondary constituent units (system domains) of each sequence with time