古地理学报 ›› 2017, Vol. 19 ›› Issue (3): 445-456. doi: 10.7605/gdlxb.2017.03.034

• 岩相古地理学及沉积学 • 上一篇    下一篇

宁夏固原古近系寺口子组砂岩成因探讨*

杨帆1, 2, 李孝泽1   

  1. 1 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,甘肃兰州 730000;
    2 中国科学院大学,北京 100049
  • 收稿日期:2016-12-05 修回日期:2017-01-23 出版日期:2017-06-01 发布日期:2017-06-01
  • 通讯作者: 李孝泽,男,1964年生,研究员,主要从事沙漠与第四纪地质研究工作。E-mail: leeyan@lzb.ac.cn。
  • 作者简介:杨帆,男,1991年生,硕士研究生,沙漠与第四纪地质专业。E-mail: yangfanlzb2016@163.com。
  • 基金资助:
    *国家自然科学基金项目(编号: 41272191;40672122)资助

Discussion about origin of the Paleogene Sikouzi Formation sandstones in Guyuan,Ningxia

Yang Fan1, 2, Li Xiaoze1   

  1. 1 Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,CAS,Lanzhou 730000,Gansu;
    2 University of Chinese Academy of Science,Beijing 100049
  • Received:2016-12-05 Revised:2017-01-23 Online:2017-06-01 Published:2017-06-01
  • Contact: Li Xiaoze,born in 1964,is a research professor of desert and Quaternary geology at Northwest Institute of Eco-Environment and Resources,Chinese Academy of Science. E-mail: leeyan@lzb.ac.cn.
  • About author:Yang Fan,born in 1991,is a master degree candidate of Northwest Institute of Eco-Environment and Resources,Chinese Academy of Science,and majors in desert and Quaternary geology. E-mail: yangfanlzb2016@163.com.About the corresponding author Li Xiaoze,born in 1964,is a research professor of desert and Quaternary geology at Northwest Institute of Eco-Environment and Resources,Chinese Academy of Science. E-mail: leeyan@lzb.ac.cn.
  • Supported by:
    [Financially supported by the National Natural Science Foundation of China(No.41272191;40672122)]

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:段为河流相沉积;段,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,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。

关键词: 固原, 寺口子组, 风成砂岩, 古近纪, 沙漠沉积

Abstract: 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 planetary-wind system.

Key words: Guyuan, Sikouzi Formation, eolian sandstones, Paleogene, desert sediments

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