川滇黔桂地区下、中三叠统层序划分、对比及层序地层格架  

Sequence Division,Correlation and Framework of Lower and Middle Triassic in Sichuan-Guizhou-Yunnan-Guangxi Region

作　　者：田景春[1] 陈洪德[1] 彭军[1] 覃建雄[1] 侯中健[1] 寿建峰[2] 杨晓宁[2] 沈安江[2] 陈子炓[2] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室成都理工学院沉积地质研究所,成都610059 [2]杭州石油地质研究所,杭州310023

出　　处：《沉积学报》2000年第2期198-203,共6页Acta Sedimentologica Sinica

摘　　要：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 )The study area included Sichuan,Yunnan,Guizhou and Guangxi, there, the strata of lower and middle Triassic are widely distributed and well developed, it is one of important areas can be used to study the sequence division, correlation and framework of Triassic system. Therefore, the paper based on the sequence stratigraphy theory, discussed in detail the characteristics of the sequence boundary surface which included uncomformity surface, lithologic\|character and facies change surface, karst surface and errosion surface, etc. Among them, the uncomformlty surface, errosion surface and karst surface are type\|Ⅰ boundary surface, and lithologic\|character and facies change surface are type\|Ⅱ boundany surfaces. Based on the above, the paper divided lower and middle Triassic into six third order seauences, which are namedas S\-1 to S\-6, In the view of geologic time, it is known that early Triassic period prolonged 3.9 Ma, S 0 S\-1,S\-2 and S\-3 prolonged 1.3 Ma respectively, and middle Trassic period prolonged 6.1 Ma, S\-4,S\-5 and S\-6 prolonged 2.03 Ma respectively. From the point of sequence boundary surface characteristics, S\-2,S\-3,S\-4 and S\-5 are type\|Ⅰ sequences, and S\-1 and S\-6 are type\|Ⅱ sequences. Then the paper correlated each sequence from the study area, and built the sequence stratigraphy framework of lower and middle Triassic which showed the evolution of patterns and their relationship of different system tract.

关 键 词：中三叠统 层序划分对比 层序地层格架 下三叠统 

分 类 号：P534.51[天文地球—古生物学与地层学]