[1]葛璐月a,b,文星跃a,等.成都粘土与其下伏粘土粒度特征对比及古环境意义[J].山地学报,2019,(05):681-692.[doi:10.16089/j.cnki.1008-2786.000459]
　GE Luyuea,b,WEN Xingyuea,et al.Comparison of Particle Size Characteristics Between the Chengdu Clay and Its Underlying Clay: Implication for Paleoenvironment Changes[J].Mountain Research,2019,(05):681-692.[doi:10.16089/j.cnki.1008-2786.000459]
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成都粘土与其下伏粘土粒度特征对比及古环境意义()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2019年05期
页码:
681-692
栏目:
山地环境
出版日期:
2019-09-30

文章信息/Info

Title:
Comparison of Particle Size Characteristics Between the Chengdu Clay and Its Underlying Clay: Implication for Paleoenvironment Changes
文章编号:
1008-2786-(2019)5-681-12
作者:
葛璐月a; b; 文星跃a; b*
西华师范大学 a.国土资源学院; b. 区域环境演变与保护研究中心,四川 南充,637009
Author(s):
GE Luyuea; b;  WEN Xingyuea; b*
China West Normal University, a. College of Land and Resources; b. Research Center for Regional Environmental Evolution and Conservation, Nanchong 637009, Sichuan China
关键词:
成都粘土;  粒度参数;  分形维数;  沉积环境
Keywords:
Chengdu clay;  particle size parameters;  fractal dimension;  sedimentary environment
分类号:
P534.63; P642.13~A
DOI:
10.16089/j.cnki.1008-2786.000459
摘要:
成都粘土下伏地层为褐色粘土和网纹红土,揭示其沉积环境特征差异性对深入理解区域环境演变具有重要意义。通过对比分析三层粘土的粒度组成、粒径频率曲线、粒度参数和分形维数特征,探讨了三层粘土沉积环境的差异性。结果表明:(1)成都粘土及其下伏粘土均以粉砂(5～50 μm)为主,相较北方黄土粘粒(<5 μm)含量偏高而Kd 值偏低,且含较多>100 μm的粗颗粒。(2)三层粘土的粒度参数特征与典型风成黄土相似而明显区别于河湖相沉积物。(3)褐色粘土具有较高的粗粉砂(10～50 μm)含量和较大的粒径分布偏度、峰度值,而平均粒径(φ值)和分形维数最小; 成都粘土标准偏差为最大,峰度最小,而网纹红土的平均粒径和分形维数最大。(4)三层粘土的粒度分形维数均与粒度组成、平均粒径和峰度呈显著相关性,而仅有褐色粘土分形维数与标准偏差和偏度具有显著相关性。(5)风化成土作用会影响沉积物粒度组成、粒度参数和分形维数,成都粘土和网纹红土较褐色粘土经历了较强的风化成土作用,三层粘土按沉积时间先后古气候特征表现为暖湿-冷干-暖湿的变化趋势。
Abstract:
To further understand regional environmental evolution in the Chengdu plain, it is necessary to identify the sedimentary environment characteristics of Chengdu clays and its underlying strata which are brown clays and reticulated red clays. Particle size distribution, particle size frequency curve, particle size parameter and fractal dimension were analyzed. The results showed that:(1)Particle sizes of silt(5～50 μm)dominated the Chengdu clays and its underlying clays, while clays(<5 μm)concentrations and Kd values were higher and lower than that of northern loess, respectively; Coarse particles of >100 μm were presented in the curves of particle size frequency for all samples.(2)The three-layer clays were similar to northern loess and different from fluvial and lacustrine sediments from the characteristics of particle size parameters.(3)In comparison, the brown clays showed higher values of skewness and kurtosis as well as coarse silt(10～50 μm)concentrations, and lower values of mean particle size(φ)and fractal dimension. While higher values of standard deviation and lower kurtosis values were presented in the Chengdu clays; and the values of mean particle size(φ)and fractal dimension from the reticulated red clays were the largest.(4)The fractal dimension was significantly correlated with particle size composition, average particle size and kurtosis from the three clay layers, while only the brown clays showed a significant correlation between the values of fractal dimension, standard deviation and skewness.(5)The Chengdu clays and reticulated red clays rather than the brown clays once experienced a strong weathering and pedogenesis process, showing a climatic change trend of warmth-humidity to cold-drought and to warmth-humidity.

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备注/Memo

备注/Memo:
收稿日期(Received date):2018-12-14; 改回日期(Accepted date):2019-05-14
基金项目(Foundation item):国家自然科学基金面上项目(41671220); 西华师范大学英才项目(17YC126)。[National Natural Science Foundation of China(41671220); Talent Project of China West Normal University(17YC126)]
作者简介(Biography):葛璐月(1994-),女,河北邢台人,硕士研究生,主要从事土壤地理研究。[GE Luyue(1994-), female, born in Xingtai, Hebei province, M.Sc. candidate, research on soil geography] E-mail: 1059230589@qq.com
更新日期/Last Update: 2019-09-30