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中国沙漠 ›› 2023, Vol. 43 ›› Issue (4): 107-117.DOI: 10.7522/j.issn.1000-694X.2023.00005

• • 上一篇    

库布齐沙漠地表沉积物常量元素与粒度的关系

孟庆爽(), 左合君(), 闫敏, 王海兵, 席成   

  1. 内蒙古农业大学 沙漠治理学院/风沙物理与防沙治沙工程重点实验室,内蒙古 呼和浩特 010018
  • 收稿日期:2022-10-19 修回日期:2023-02-11 出版日期:2023-07-20 发布日期:2023-08-14
  • 通讯作者: 左合君
  • 作者简介:左合君(E-mail: Zuohj@126.com
    孟庆爽(1997—),女,天津人,硕士研究生,主要从事荒漠化防治研究。E-mail: 474897970@qq.com
  • 基金资助:
    “科技兴蒙”行动重点专项(KJXM-EEDS-202006);内蒙古自治区研究生科研创新项目(S20210212Z)

Relationship between constant elements and granularity of the surface sediment in the Kubuqi Desert

Qingshuang Meng(), Hejun Zuo(), Min Yan, Haibing Wang, Cheng Xi   

  1. College of Desert Control Science and Engineering / Inner Mongolia Key Laboratory of Aeolian Physics and Desertification Control Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China
  • Received:2022-10-19 Revised:2023-02-11 Online:2023-07-20 Published:2023-08-14
  • Contact: Hejun Zuo

摘要:

地表沉积物的风化过程引起元素在各粒级间的迁移或富集,采用粒度分级可以深度解释元素与粒度的关系。选取库布齐沙漠不同植被盖度测定粒度分布特征分级情况下的元素含量。结果表明:(1)库布齐沙漠以细砂和极细砂为主(二者占比85%以上),常量元素以SiO2、Al2O3为主(二者占比80%以上且呈相反关系),其他元素含量较低;不同粒级组分元素富集情况不同。(2)表层沉积物的化学蚀变指标CPA(60.2~85.9)、CIA(28.08~53.06)值显示该区域处于未风化或弱风化状态;研究区表现为富SiO2、CaO、Fe2O3、K2O、TiO2贫Al2O3、Na2O现象;SiO2、K2O与粒径段呈显著正相关,Fe2O3、CaO、Al2O3、MgO、TiO2与粒径段呈显著负相关,Na2O不受粒度控制。(3)分级前,CaO、SiO2、MgO、TiO2与粒径有相关性;分级后,SiO2、K2O、Fe2O3、CaO、Al2O3、MgO、TiO2均与粒径段具有一定的相关性,细化分级后确实能解读更多蕴含在元素中的信息。

关键词: 库布齐沙漠, 沉积物粒度, 地球化学元素, 粒度效应

Abstract:

The weathering process of surface sediments causes the migration or enrichment of elements in each grain level. Granularity classification can deeply explain the relationship between elements and granularity. The coverage of different vegetation in the Kubuqi Desert was selected to determine the element content of grain size distribution characteristics.The results show that: (1) The Kubuqi Desert is mainly dominated by fine sand and extremely fine sand (both account for more than 85%), and the constant elements are mainly SiO2 and Al2O3 (accounting for more than 80% and showing the opposite relationship), while other elements have low content; the enrichment of different granular components is different. (2) CPA(60.2-85.9), CIA(28.08-53.06) value of surface sediment shows that the area is in unweathered or weakly weathered state; the study area shows rich SiO2, CaO, Fe2O3, K2O, TiO2 poor Al2O3 and Na2O; SiO2 and K2O are significantly positively correlated with particle size, Fe2O3, CaO, Al2O3, MgO and TiO2 are significantly negatively correlated with particle size, and Na2O is not controlled by particle size. (3) Before classification, the four elements of CaO, SiO2, MgO and TiO2 are related with the particle size; after classification, SiO2, K2O, Fe2O3, CaO, Al2O3, MgO and TiO2 all have certain correlation with the particle size segment, detailed grading can indeed interpret more information contained in the elements.

Key words: Kubuqi Desert, sediment particle sizes, geo-chemistry elements, granularity effect

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