杭州上泥盆统西湖组露头层序地层研究

依据露头剖面层序地层的详细研究，将杭州上泥盆统西湖组划分为2个三级层序，其高频变化表现为：海进及低位体系域的粒序变化主要表现为下粗上细的正粒序组构特征，总体表现为自下而上沉积水体由浅变深的退积型旋回；高位体系域自下而上表现为由细变粗的逆粒序组构特征，总体构成下细上粗的向上变浅的进积型旋回。认为构造活动和海平面变化是控制西湖组层序发育演化的主要因素，并将其发育演化分成三个阶段：滨岸相之近滨上部转换为前滨与后滨交替沉积阶段，曲流河之河道与边滩反复沉积阶段，浅海陆棚与近滨下部相间沉积阶段。

Study on Outcrop Sequence Stratigraphy of the Upper Devonian Xihu Formation in Hangzhou

Based on detailed studies of sequence stratigraphy for outcrop section,the Upper Devonian Xihu Formation in Hangzhou can be divided into two third-order sequences,whose high-frequency cycles is presented as: the normal grading succession being coarse in grain size in the lower part and fine in the upper part characterize the TST and LST,and the retrograding sequence of being from shallow to deep in water depth;the inverse grading succession being fine in grain in the lower and fine in the upper part charact...