【摘要】 依据实测地层剖面的详细研究,将二叠系孤峰组分为四个三级层序,每个三级层序跨时平均约1.25Ma,其高频变化表现为:海侵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深变浅的进积型旋回。更多还原

【Abstract】 The Permian Gufeng Formation strata in the Guichi area of Anhui Province may be divided into 4third order sequence,and each may be about 1.75Ma,usually having TST,CS and HST,but same se-quence no CS,the high-frequency sequences in the study area are of two types:the normal grading succes-sion being coarse in grain size below and fine above in HST,and the retrograding sequence of being fromshallow to deep in water depth; the inverse grading succession being coarse in grain below and fine abovein TST,and the prograding sequence being from deep to shallow.更多还原