摘要
分布于鄂尔多斯盆地东南缘毛乌素沙地的砒砂岩,是形成于古生代的二叠纪、中生代的三叠纪、侏罗纪以及白垩纪的厚层砂岩、砂页岩以及泥质砂岩组成的岩石互层,主要岩性为陆相碎屑岩。砒砂岩具有无水时坚硬,遇水如软泥、极易被水蚀、风蚀的特性,实验发现其渗透系数为5. 2×10-3mm/s,渗透性较好,塑性指数Ip为9. 40,较大,表明亲水性较好;从砒砂岩所组成的矿物成分来看,石英是主要的岩石成分,Si O2含量高,因此砒砂岩成分成熟度高、结构成熟度低,外观表现在胶结程度差、结构强度低。另外,通过分析古生代、中生代各个地层砂岩岩相特征、组成特征、沉积演化特征来还原砒砂岩不同形成时期的沉积环境,以解释不同厚层砒砂岩的形成原因。
The Pisha-sandstone,located in the southeastern margin of the Ordos Basin,which is the thick sandstone,sand shale and argillaceous sandstone interbedded rocks of Paleozoic Permian Triassic and Jurassic Cretaceous Mesozoic,mainly composed of continental clastic rock.The study found that when the hard Pisha-sandstone are anhydrous water,such as sludge,vulnerable to erosion characteristics is due to its good permeability,high plasticity index,good hydrophilicity.From the micro perspective,the rock composition has mainly the quartz that due to its simple structure,low degree of cementation,poor construction strength.In addition,through the analysis of Pisha-sandstone lithic facies characteristics,composition,characteristics of sedimentary evolution in the various strata of Paleozoic and Mesozoic,to restore Pisha-sandstone formed in different sedimentary environment during the period,in order to explain the causes of the different thick layer of Pisha-sandstone.
作者
曹石榴
Cao Shiliu(Shaanxi Provincial Land Engineering Construction Group Co.,Ltd.,Xi′an 710075,China;Institute of Land Engineering and Technology,Shaanxi Provincial Land Engineering Construction Group Co.,Ltd.,Xi′an 710075,China;Key Laboratory of Degraded and Unused Land Consolidation Engineering,the Ministry of Land and Resources of China,Xi′an 710075,China;Shaanxi Provincial Land Engineering Consolidation Engineering Technology Research Center,Xi′an 710075,China)
出处
《能源与环保》
2018年第10期72-76,81,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
陕西省重点科技创新团队计划项目(2016KCT-23)
关键词
砒砂岩
毛乌素沙地
沉积环境
岩石学特性
成因
Pisha-sandstone；Mu US Desert；sedimentary environment；petrological characteristics；cause
