干旱区生态环境知识资源中心(Arid): 宁夏固原古近系寺口子组砂岩成因探讨

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	宁夏固原古近系寺口子组砂岩成因探讨
其他题名	Discussion about origin of the Paleogene Sikouzi Formation sandstones in Guyuan,Ningxia
	杨帆; 李孝泽
来源期刊	古地理学报
ISSN	1671-1505
出版年	2017
卷号	19 期号:3 页码:445-456
中文摘要	宁夏固原寺口子组砂岩是中国古近纪内陆古环境研究的重要载体。通过岩性、沉积构造、石英颗粒表面微结构和粒度分布特征研究,对其成因进行了深入探讨。结果表明,古近系寺口子组砂岩由3个成因段构成:段Ⅰ为河流相沉积;段Ⅱ,即砂岩主体,为典型风成砂岩,沉积环境为风成沙丘和丘间地;段Ⅲ,初步推断其为湖相沉积。结合中国古近纪气候背景、研究区域地形条件及古风向,推断寺口子组砂岩主体风成沉积为行星风系控制下的沙漠沉积。
英文摘要	The Paleogene Sikouzi Formation sandstones in Guyuan,Ningxia provide great potential for understanding paleo-environment of the Paleogene inland in China. Based on the lithology,sedimentary structures,surface features of quartz grains and grain size distribution,the orgin of these red sandstones are intensively discussed. This study indicates that the Paleogene Sikouzi Formation sandstones are with a combination of three kinds of sedimentary members: The Member Ⅰ of Sikouzi Formation is fluvial sediments; the Member Ⅱ of Sikouzi Formation,as the main part of the sandstones,belongs to the typical eolian sandstones,and it can be inferred that the sedimentary environment is eolian sand dunes and interdunal depression;the Member Ⅲ of Sikouzi Formation is judged to be lacustrine sediments preliminarily. Combined with the palaeoclimate,orographic condition of the study area and palaeowind, the eolian deposits,as the main part of the Sikouzi Formation sandstones,can be deduced to develop in desert environment controlled by the planetarywind system.
中文关键词	固原 ; 寺口子组 ; 风成砂岩 ; 古近纪 ; 沙漠沉积
英文关键词	Guyuan Sikouzi Formation eolian sandstones Paleogene desert sediments
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:6000573
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236116
作者单位	中国科学院西北生态环境资源研究院, 中国科学院沙漠与沙漠化重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	杨帆,李孝泽. 宁夏固原古近系寺口子组砂岩成因探讨[J]. 中国科学院西北生态环境资源研究院,2017,19(3):445-456.
APA	杨帆,&李孝泽.(2017).宁夏固原古近系寺口子组砂岩成因探讨.古地理学报,19(3),445-456.
MLA	杨帆,et al."宁夏固原古近系寺口子组砂岩成因探讨".古地理学报 19.3(2017):445-456.