末次冰期晚期以来地层序列与地质环境特征——渤海南部地区沉积序列研究

Stratigraphic Sequences and Characteristics of Geological Environment since the Late Period of Last Glacial Age along Southern Shore of Bohai Sea

就渤海南部末次冰期晚期以来的地层序列与地质环境演化特征，将研究区划分出４个沉积环境区，分别选择４个典型钻孔（ＺＫ１０１，ＺＫ２２８，Ｃ３０５，Ｙ８６）进行了对比研究。选用２７个钻孔联成２８２ｋｍ长的地层剖面，剖面明显反应出郯庐断裂带挽近的运动及现代黄河三角洲体的均衡作用。同时。

Four typical cores (ZK101, ZK228, C305 and Y86) are used in this paper to study the sedimentary sequences and geological environment evolution. Twentyseven cores are chosen to form a stratum section of 282 km long, from which we can find the tectonic movement since 20 Ka B. P.. The sea water of transgression entered the Bohai area at about 10 Ka B. P. from the Huanghai area. The sea level rose rapidly before 6 Ka B. P. at a mean rate of 5 mm/a. Then, the sea level changed wavily. It is concluded that the tectonic movement must be considered in studying sea level changes. The transgression boundary layer was a lag stratum of shore facies during the period of transgression and was distributed widely. The dynamic processes of the transgression and sea level rise can be revealed on the basis of analysing the boundary layer in detail.