摘要
辽南地区张夏组中上部高频率旋回地层特征明显，反映高频旋回特点。根据岩性、岩相及界面特征，对其进行划分。其中复州地区划分出４个四级旋回层序，２１个五级旋回层序，７０～８０个六级旋回层序；大连地区共划分出４个四级旋回层序，１９个五级旋回层序及７４个六级旋回层序。各级别旋回层均由相应的次一级旋回层序向上变浅、变厚、变粗的序列组成，其底部均以相应级别的间断—加深面为界。三、四级旋回层序具有区域对比意义。该期海平面具有高频振荡特点，为一复合海平面变化旋回。
Mid Upper strata of Zhangxia F. in the south of Liaodong peninsula have obvious features of high frequency cycling. Based on the characteristics on the aspects of lithology, lithofacies, the high frequency cycling stratigraphic sequences in Fuzhou area can be subdivided into 4 Grade Ⅳ, 21 Grade Ⅴ,and 70-80 Grade Ⅵ cycling stratigraphic sequences; and in Dalian area,they can be subdivided into 4 Grade Ⅳ,19 Grade Ⅴ, and 74 Grade Ⅵ cycling stratigraphic sequences. Every grade of cycling stratigraphic sequences is composed of its secondary grades, which upwards get shallower, thicker and coarser , and on each bottom it is bounded by a break deepen boundary by another sequence of the same grade. The sea level of the period has a feature of high frequency oscillating , forming a compound sea level changing cycle.
关键词
地层
张夏组
高频率旋回层序
海平面变化
Fuzhou, Jinzhou, Mid Upper Zhangxia F., High frequency cycling stratigraphic sequence, Compound sea level, Change
