冀北承德盆地杏石口组沉积相及演化模式  

The sedimentary facies and evolution model of the Xingshikou formation in Chengde Basin,Northern Hebei province

作　　者：彭芊芃 赵海璇[1] 关秀宇[1] 李庆喆[1] 季虹[1] 张运强[1] 

机构地区：[1]河北省区域地质矿产调查研究所,河北廊坊065000

出　　处：《地质调查与研究》2017年第3期178-182,188,共6页Geological Survey and Research

基　　金：国家地质调查项目"河北1/5万新杖子;承德幅区域地质矿产调查(1212011220486)"

摘　　要：笔者在完成"河北1/5万新杖子、承德幅区域地质矿产调查"工作中,选取了更具代表性的承德县上谷乡杏石口组剖面进行了实测和研究,并将其细分为两个岩性段,一段以粗碎屑沉积为主,岩性主要为砾岩夹少量砂岩透镜体;二段主体为一套细碎屑沉积,岩性为砂岩、粉砂岩、粉砂质泥岩(局部发育1-2层煤线)。据岩石组合特征将其划分为泥石流沉积、辫状河道沉积、筛状沉积、漫流沉积、河道滞留沉积、边滩沉积和河漫滩沉积共7种沉积成因类型,进而归纳出杏石口组一段属于冲积扇沉积相,包括扇根、扇中和扇缘3个沉积亚相;杏石口组二段为河流沉积相;晚期局部沼泽化,形成河沼相沉积。在此基础上初步建立了杏石口组沉积演化模式。During 1/50 000 geological survey in the Xinzhangzi and Chengde areas. The authors have surveyed the Xingshikou profile, and then divided it into two parts. The lower one is rich in conglomerate with lenticular sandstone, however, a lot of sandstone, siltstone and silty mudstone were found in the upper one, which developed one to two layers coal in some location. Based on the lithological characters of the Xingshikou formation, it is suggested that the sedimentary genetic types of the Xingshikou formation can be divided into seven types： debris flow, braidly stream channel, sieve deposit, sheet flood deposit, channel lag deposit, alternative bar and flood-plain deposit. The results show that the first part of the Xingshikou formation belongs to the alluvial fan facies, which can be further divided into three sub-facies, including top, middle and edge fans, while the second part are the fluvial sedimentary facies. Through the research on the sedimentary facies and genetic types, the sedimentary evolution model of the Xingshikou group is established

关 键 词：沉积相 演化模式 冲积扇 杏石口组 承德盆地 

分 类 号：P168.13[天文地球—天文学]