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2022 , Vol. 45 >Issue 1: 141 - 152

DOI: https://doi.org/10.12118/j.issn.1000–6060.2021.176

地表过程研究

敦煌雅丹地层沉积物粒度特征初步研究

  • 梁晓磊 ,
  • 翟晓慧 ,
  • 牛清河 ,
  • 胡子豪 ,
  • 王天虎 ,
  • 刘万成
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  • 1.太原师范学院管理系,山西 晋中 030619
    2.中国科学院西北生态环境资源研究院敦煌戈壁荒漠研究站/甘肃省风沙灾害防治工程技术研究中心/中国科学院沙漠与沙漠化重点实验室,甘肃 兰州 730000
    3.中国科学院新疆生态与地理研究所,新疆 乌鲁木齐 830011
    4.敦煌市雅丹景区服务中心,甘肃 酒泉 736200
梁晓磊（1986-）,男,讲师,博士,主要从事风沙地貌等方面的研究. E-mail: liangxl@lzb.ac.cn

收稿日期: 2021-04-19

  修回日期: 2021-11-15

  网络出版日期: 2022-01-21

基金资助

国家自然科学青年基金(42001007);国家自然科学基金(42171016)

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Grain-size characteristics of yardang strata sediment in the Dunhuang Yardang National Geopark, northwest China

  • Xiaolei LIANG ,
  • Xiaohui ZHAI ,
  • Qinghe NIU ,
  • Zihao HU ,
  • Tianhu WANG ,
  • Wancheng LIU
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  • 1. Department of Management, Taiyuan Normal University, Jinzhong 030619, Shanxi, China
    2. Dunhuang Gobi and Desert Research Station/Gansu Center for Sand Hazard Reduction and Engineering and Technology/Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China
    3. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
    4. Dunhuang Yardang Scenic Area Service Center, Jiuquan 736200, Gansu, China

Received date: 2021-04-19

  Revised date: 2021-11-15

  Online published: 2022-01-21

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摘要

雅丹地层是雅丹地貌发育前整个沉积体系的物质体现,记录了沉积过程中的大量信息,而沉积物分析则是解读其关键信息的基础。以敦煌雅丹地貌为研究对象,对其出露地层的沉积物粒度特征进行了初步研究。结果表明：（1） 敦煌雅丹地层沉积物粒径组成以粉沙为主,平均含量分别为41.08%（YA）、36.82%（YB）和35.41%（YC）,自东向西含量递减,并含有较高比重的粗沙组分,空间变化趋势与粉沙相反。（2） 雅丹地层沉积物粒径组成和粒度参数纵向变化特征显著,剖面沉积段物质以粗（中沙、细沙为主）细（粉沙、黏土为主）旋回变化为特征,交界面与雅丹三级阶梯相吻合。（3） 雅丹地层是不同沉积环境和动力机制下形成的多种沉积物混杂堆积的结果,主要为风成、河流和湖泊环境交替沉积的结果,其中河流与湖泊沉积环境的亚环境类型更是复杂多样,有待进一步的深入研究。

关键词： 雅丹地层; 沉积物; 粒度分析; 粒度频率分布曲线; 粒度参数

本文引用格式

梁晓磊 , 翟晓慧 , 牛清河 , 胡子豪 , 王天虎 , 刘万成 . 敦煌雅丹地层沉积物粒度特征初步研究[J]. 干旱区地理, 2022 , 45(1) : 141 -152 . DOI: 10.12118/j.issn.1000–6060.2021.176

Abstract

The yardang strata is the material manifestation of the sedimentary system before the yardang landform developed. It collects a large amount of data about the deposition process, and sediment analysis is the foundation for interpreting its key findings. The research object in this paper is the Dunhuang yardang landforms in the Dunhuang Yardang Geopark, Gansu Province of northwest China and it is a preliminary study on the grain-size characteristics of the exposed strata sediments. The results indicated that: (1) The grain-size composition of Dunhuang yardang strata sediments is dominated by silt, with an average content of 41.08% (profile YA), 36.82% (profile YB), and 35.41% (profile YC), and its content decreases from east to west. It also contains coarse sand components with higher specific gravity, and the spatial change trend is the inverse of that of silty sand. (2) There are considerably vertical changes in the grain-size composition and parameters of the yardang strata, which are characterized by the alternation of coarse sand (primarily medium and fine sand) and fine sand (mainly silt and clay). Meanwhile, the interface is highly consistent with the shape of yardang’s three-level ladder. (3) The yardang stratum is the result of the mixed accumulation of various sediments formed under different sedimentary environments and dynamic mechanisms. It is primarily the result of alternate aeolian, fluvial, and lacustrine deposition. The subenvironmental types of fluvial and lacustrine sedimentary environments are the most complex and diverse, necessitating extensive research.

Key words： yardang strata; sediment; grain-size analysis; grain-size frequency distribution curve; grain-size parameter

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