安徽铜陵地区石炭系层序地层研究

The study of sequence stratigraphy of Upper Carboniferous Series in the area of Tongling, Anhui

根据野外露头对铜陵地区的上石炭统进行了层序地层分析。上石炭统分为 A、B、C 3个沉积层序 ,分别相当于黄龙组的下部、中上部和船山组。其中层序 A、C属于 类层型界面 ,层序 B属于 类层型界面。与 类界面相比 , 类界面比较清晰易辨。区内缺乏低位域 ,层序由海侵体系域 (TST)和高位域 (HST)组成 ,并且海侵体系域不甚发育 ,高位域组成了层序的主体。海平面变化控制了层序的演变 。

The paper makes an analysis of the sequence stratigraphy of the Upper Carboniferous in the area of Tongling on the basis of the outcrop profiles. The Upper Carboniferous is divided into A, B and C three sequences and they may correspond to the lower, middle upper of Huanglong Formation and Chuanshan Formation respectively. Sequences A and C are type Ⅰboundary, and sequence B is type Ⅱboundary. Type Ⅰ boundary is more distinct and easier to identify than type Ⅱ boundary. The sequences are only composed of transgressive systems tract (TST) and highstand systems tract (HST) because of lack of lowstand systems tract (LST), and in fact the sequences are mainly composed of HST because of poor development of TST. The evolution of sequences is largely controlled by sea level changes. The aerial structural subsidence influences thickness of deposits.