干旱区生态环境知识资源中心(Arid): 甘肃新近系疏松砂岩成因

Arid

	甘肃新近系疏松砂岩成因
其他题名	Genetic Analysis of the Neogene Unconsolidated Sandstone in Gansu,Northwest China
	刘高 1; 魏蒙恩 2; 谢裕江 3; 张雷 2; 罗泽华 2; 王彦蓉 2; 姜秉秉 2
来源期刊	地质论评
ISSN	0371-5736
出版年	2015
卷号	61 期号:1 页码:139-148
中文摘要	近年来重大地下工程中揭露一套结构疏松,自稳能力差,涌水、塌方等工程事故频发的岩层,即疏松砂岩。分析其成因及赋存环境对认识其特殊性质及应对相关工程问题都具有重要意义。本文结合甘肃新近系沉积环境,采用室内粒度分析试验、SEM及 XRD 试验,并与现代沙漠风成沙与河床水成沙对比,从其分布及产出特征、粒度特征、石英颗粒表面特征及胶结特征等方面对其成因进行分析。研究表明,这套疏松砂岩与相邻岩层产出相近,归属于甘肃新近系红层;其粒径相对集中,胶结物含量少、胶结差,孔隙度大;石英颗粒表面发育蝶形坑、麻面及硅质沉淀等典型特征。综合其各种特征,甘肃新近系疏松砂岩为新近纪干热气候环境下风沙活动的产物,且受后期赋存水环境作用的影响。
英文摘要	In recent years,a set of strata with loose structure and worse self-stabilization,which named unconsolidated sandstone,has been exposed by several large underground engineerings with frequent engineering accidents,such as gushing water,collapse and other problems.Analyzing its origin and occurrence environment is of great significance both in understanding the essence of its special properties and dealing with the relevant engineering issues. Combined with sedimentary environment of the Neogene in Gansu,the origin of the unconsolidated sandstone,which can be comparing with modern desert aeolian sand and beach sand,is studied by using grain size analysis,scanning electronic microscope (SEM) and Xr-ay diffraction (XRD) by which its distribution characteristics,occurrence and exposure characteristics,grain-size characteristics,quartz sand grain surface characteristics and cementation characteristics,would be discussed in this paper.The analysis result shows that the unconsolidated sandstone,which belongs to the parts of the Neogene red layers in Gansu province,has the same occurrence and exposure characteristics as adjacent strata.And this sandstone has well-sorted,large porosity and less clay minerals.Its quartz grain surface shows some butterfly shaped craters,surface pockmarks and siliceous sediments.All of those characteristics can be inferred that the unconsolidated sandstone in Gansu is the wind -sand activity product with dry and hot climate in late Neogene,and parts of the strata are influenced by water environment afterwards.
中文关键词	新近系 ; 疏松砂岩 ; 成因 ; 形成环境 ; 扫描电镜 ; X 射线衍射
英文关键词	Neogene unconsolidated sandstone origin formation environments SEM XRD
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MULTIDISCIPLINARY SCIENCES
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5334584
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232538
作者单位	1.兰州大学, 西部灾害与环境力学教育部重点实验室, 兰州, 甘肃 730000, 中国; 2.兰州大学土木工程与力学学院, 兰州, 甘肃 730000, 中国; 3.汉堡大学地球物理研究所, 汉堡, D-20146, 德国
推荐引用方式 GB/T 7714	刘高,魏蒙恩,谢裕江,等. 甘肃新近系疏松砂岩成因[J]. 兰州大学,2015,61(1):139-148.
APA	刘高.,魏蒙恩.,谢裕江.,张雷.,罗泽华.,...&姜秉秉.(2015).甘肃新近系疏松砂岩成因.地质论评,61(1),139-148.
MLA	刘高,et al."甘肃新近系疏松砂岩成因".地质论评 61.1(2015):139-148.