Particle-size Characteristics and Sedimentary Environment of Dune Sediments in Southwestern Qaidam Basin

Wang Meng; Gao Xuemin; Qu Xin; Liu Zhengxin; Li Jiyan

doi:10.13961/j.cnki.stbctb.2022.05.008

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Particle-size Characteristics and Sedimentary Environment of Dune Sediments in Southwestern Qaidam Basin

- Particle-size Characteristics and Sedimentary Environment of Dune Sediments in Southwestern Qaidam Basin
- Bulletin of Soiland Water Conservation Vol. 42, Issue 5, Pages: 57-64(2022)
- 作者机构：
  
  1. 太原师范学院地理科学学院,山西,晋中,030619
  2. 晋中学院旅游管理系,山西,晋中,030619
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.05.008
  CLC：
- Published：2022
- 稿件说明：
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Wang Meng, Gao Xuemin, Qu Xin, et al. Particle-size Characteristics and Sedimentary Environment of Dune Sediments in Southwestern Qaidam Basin[J]. Bulletin of Soiland Water Conservation, 2022, 42(5): 57-64.
DOI：

Wang Meng, Gao Xuemin, Qu Xin, et al. Particle-size Characteristics and Sedimentary Environment of Dune Sediments in Southwestern Qaidam Basin[J]. Bulletin of Soiland Water Conservation, 2022, 42(5): 57-64. DOI： 10.13961/j.cnki.stbctb.2022.05.008.

摘要

[目的] 研究柴达木盆地西南缘沙丘沉积物粒度特征及其沉积环境，为格(尔木)库(尔勒)铁路防沙和安全运行提供基础数据支撑。[方法] 通过粒度分析方法对柴达木盆地西南缘沙丘区沙丘沉积物的粒度特征及沉积环境进行分析。[结果] 柴达木盆地柴西南沙区沙丘表层沉积物以细沙为主，中沙次之，平均粒径-0.14~3.49Φ，平均值为2.02Φ；分选系数为0.32～1.59，平均值为0.69，以分选较好和好的沙粒为主；偏度主要为近对称分布；峰度以中等峰态占优。自然频率分布曲线呈单峰和双峰分布模式，累积频率曲线图式为一段式、二段式、三段式。平均粒径与分选系数呈线性相关关系，即随平均粒径变细，分选逐渐变好。当峰度＜0.9时，平均粒径与峰度呈负相关；当峰度＞0.9时呈正相关。[结论] 柴达木盆地西南沙区西北部为风成环境，以风成沙为主；而东南部以湖相和河流冲—洪积环境为主，沙物质受到风力和流水的交互作用。

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