摘要
青藏高原北部的沉积岩是在特定的地质条件下演化的阶段产物,其中青海海西州茫崖镇地区晚古生代早石炭纪地层发育良好,化石丰富,独具特色。本文讨论了该地区下向上石拐子组和大干沟组地层组剖面岩石组合特征,以薄片显微图像说明典型岩石组构、矿物组合等为特色,探讨了各岩性组地层的沉积环境,得出石拐子组上下两段沉积环境分别为浅海砂岩相和浅海-陆棚碳酸盐相,大干沟组沉积环境属于浅海碳酸岩相和浅海-陆棚碳酸岩相。为该地区开展基础地质研究、层序地层分析等工作提供基础资料。
The sedimentary rocks in the northern part of the Qinghai-Tibet Plateau are the stage products of evolution under certain geological conditions.Among them,the Late Paleozoic Early Carboniferous strata in the Mangya Township area of Haixi Prefecture,Qinghai Province are well developed,with rich fossils and unique features.In this paper,the rock combination characteristics of the Upper Shijiazi Formation and the Dagangou Formation strata in the area are discussed.The thin rock micrographs illustrate typical rock fabrics and mineral combinations,and the sedimentary environment of each lithologic stratum is discussed.It is concluded that the sedimentary environments of the upper and lower sections of the Shizhuzi Formation are shallow sea sandstone facies and shallow sea-continent carbonate facies.The sedimentary environment of the Dagangou Formation belongs to the shallow sea carbonate facies and the shallow sea-continent carbonate facies.It provides basic information for basic geology research and sequence stratigraphic analysis in the region.
作者
冯丹
杨德方
苏桂芬
FENG Dan;YANG Defang;SU Guifen(College of Geoscience and surveying engineering,China University of Mining and Technology,Beijing,100083,China;School of Safety Engineering,North China Institute of Science and Technology,Yanjiao,065201,China;Cores and Samples Center of Land and Resources,Yanjiao,065201,China)
出处
《华北科技学院学报》
2019年第3期88-94,共7页
Journal of North China Institute of Science and Technology
关键词
青海海西州茫崖镇
早石炭纪地层
岩石特征
沉积环境
Mangya Town Haixi Prefecture Qinghai Province
Early Carboniferous strata
rock characteristics
sedimentary environment
