太原西山二叠系山西组沉积微相及其演化规律  

Sedimentary microfacies and sedimentary evolution of Shanxi formation in Xishan area,Taiyuan

作　　者：牛永斌[1,2] 朱信生[1] 胡斌[1,2] 王芳[1] 

机构地区：[1]河南理工大学资源环境学院,河南焦作454000 [2]河南省生物遗迹与成矿过程重点实验室,河南焦作454000

出　　处：《河南理工大学学报（自然科学版）》2015年第4期483-490,共8页Journal of Henan Polytechnic University（Natural Science）

基　　金：山西省自然科学基金资助项目(41102076);河南理工大学博士基金资助项目(B2011-046)

摘　　要：在对太原西山地区山西组野外露头实地观测的基础上,通过采样分析、薄片镜下观测和粒度分析等手段,对太原西山地区二叠系山西组沉积微相发育特征及其演化规律进行研究。结果表明:太原西山地区二叠系山西组主要为河控三角洲沉积,可进一步划分为两个亚相和七个微相。伴随着研究区山西组沉积期海水总体由北西向南东退去,沉积环境从三角洲前缘过渡为三角洲平原沉积;沉积微相呈现出由分支河口沙坝微相→水下分支河道微相→水下天然堤→支流间湾微相→沼泽微相→陆上分支河道微相→陆上天然堤微相→沼泽微相的演化规律。Based on the field outcrop observation of Shanxi formation in Xishan area,Taiyuan,by using the methods of sample analysis,thin-section observation,particle size analysis and so on,sedimentary microfacies and sedimentary evolution were studied. The results show that sedimentary environment of Shanxi formation of Permian is fluvial dominates delta deposition in Xishan area,Taiyuan. The sedimentary facies can be further divided into two subfacies and seven microfacies. Accompanying with the sea regression occurred from northwest to southeast during the sedimentary period of Shanxi formation in the research area,sedimentary environment is from delta front to delta plain sedimentary. The evolutions laws of sedimentary microfacies are via branch debouch bar microfacies→underwater distributary channel microfacies→underwater natural levee microfacies→distributary bay microfacies→marsh microfacies→branch channel→onshore natural levee microfacies→marsh microfacie.

关 键 词：山西组 三角洲 沉积微相 粒度分析 

分 类 号：P534[天文地球—古生物学与地层学]