中上扬子区寒武纪层序地层划分与对比

CAMBRIAN SEQUENCE-STRATIGRAPHY IN THE MIDDLE AND UPPER YANGTZE PLATFORM

在对研究区寒武纪典型地层剖面测量的基础上,在新的年代地层框架内,从沉积相的分析入手,研究了中上扬子区寒武系层序地层的划分,共识别出14个三级层序,其中,滇东统划分出3个三级层序,黔东统划分出7个三级层序;武陵统和芙蓉统共4个三级层序,分属两个二级层序,其中滇东统和黔东统的10个三级层序划归寒武系下部的二级层序,武陵统和芙蓉统划归寒武系上部的二级层序;同时,对不同沉积相区的层序地层进行了对比。

The sequence stratigraphy of Cambrian strata in the middle and upper Yangtze Platform was analyzed based on newly measured sections and sedimentary facies data, in the newly developed Cambrian chonostratigraphic frame of South China. Fourteen third-order sequences are recognized, of which three belong to the Diandongian Series, seven to the Qiandongian Series, and four to the Wulingian and Furongian Series. These 14 third-order sequences are grouped into two second-order sequences. The lower second-order sequence consists of 10 third-order sequences belonging to the Diandongian and the Qiandongian Series, whereas the upper second-order sequence includes 4 third-order sequences belonging to the Wulingian and Furongian Series. Stratigraphic correlation has been proposed within this sequence stratigraphical framwork.