苏皖下扬子地区石炭系层序地层学特征

在野外地质勘查的基础上,运用层序地层学的理论和研究方法,对苏皖下扬子地区石炭系露头进行了精细的层序地层研究和层序划分、对比,详细阐述了层序建立和层序特征。研究结果表明,苏皖下扬子地区石炭系可以分为6个三级层序,其中层序SQ₁、SQ₅、SQ₆属于Ⅰ型层序,层序SQ₂、SQ₃、SQ₄属于Ⅱ型层序。在苏皖下扬子的东北部地区SQ₁—SQ₆六个层序发育完整,而在西南部地区SQ₁—SQ₄四个层序存在不同程度的缺失;SQ₅、SQ₆层序则全区广布。

Sequence Stratigraphy of Carboniferous in Lower Yangtse Area of Jiangsu and Anhui Provinces

This paper presents a detailed study of outcrop sequence stratigraphy of Carboniferous in Lower Y angtse area of Jiangsu and Anhui Provinces in China, on the basis of field geologic examination, making use of theory and method of sequence statigraphy, and with aid of the detailed stratigraphic classification and correlation in this area, hence the characteristics of the sequence and its establishment are suggested. And the sequence classification and regional correlation of Carboniferous in Lower Yangtse area are discussed. Results show that this area can be divided into 6 third-grade sequences (SQ₁-SQ₆), among which SQ₁, SQ₅, SQ₆ belong to Type I sequence; SQ₂ SQ₃, SQ₄ to Type II sequence. In northeastern part of Lower Yangtse area, SQ₁-SQ₆ are completely developed; in southwesterm part of it, SQ₁-SQ₄ are absent in different degrees; SQ₅, SQ₆ are distributed in the whole area.