吉林省梨树县石岭镇榆树林村—放牛沟登娄库组剖面沉积演化特征

本剖面地处吉林省四平市梨树县石岭镇境内，区域构造虽属郯庐断裂带北段西支依兰—伊通断裂带，但剖面地层形成年代却早于依兰—伊通断裂带【1】。剖面出露的登娄库组地层厚度共288.60m，其底部与营城组火山碎屑岩成角度不整合接触，上部地层未完全揭露。通过对剖面地层的细致考察同时结合区域地质资料，该剖面登娄库组地层主要沉积了一套粒度较粗的陆源碎屑岩，岩性以砂岩、砾岩为主，总体反映了构造运动强烈、周边地形起伏大、山区剥蚀强烈等特点的沉积环境。受断陷脉动式沉降【2】活动的影响，地层沉积相演化规律为：湖相→扇三角洲相→湖相→扇三角洲相，并在湖相和扇三角洲相研究的基础之上进一步识别出4种沉积亚相和8种沉积微相。

The Sedimentary Facies Evolutionary Regular Pattern of Lower Cretaceous Denglouku Formation Cut Plane at Yushulin -Fangniugou Village,Shiling Town in Lishu County of Jilin Province

The cut plane is at Shiling town of Lishu county in Siping City of Jilin Province,which areal structure is belong to the Yilan-Yitong fault zone the west branch of the Tan-Lu fault zone,but the formation age of the layer is earlier than the Yilan-Yitong fault zone.The lower cretaceous denglouku formation layer of this cut plane is discordant contact with lower cretaceous yingcheng formation at the bottom,which the total thickness is 288.6 m,and the top of the lower cretaceous denglouku formation was not expose.According to the accurate investigation and combination the region geologic information the lower cretaceous denglouku formation has settled a suit of coarse grained detrital rock of terrigenous origin,which are mainly made up of sandstone and gravelstone,all of this are reflect the feature of sedimentary environment were tectonic movement intense,huge of the topographic irregularity and denude intensely of the mountain region.By the affect pulsative settlement activity of the fault depression the sedimentary facies evolutionary regular pattern of the layer was: lake facies → fan delta facies → lake facies → fan delta facies,base on the research of lake facies and fan delta facies had divide 4 types of sub-sedimentary facies and 8 types of micro-sedimentary facies in further.