The characteristic of grain-size in Ejina Basin and associated sedimentary dynamic environmental analysis

doi:10.7522/j.issn.1000-694X.2021.00091

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (6): 111-119.DOI: 10.7522/j.issn.1000-694X.2021.00091

The characteristic of grain-size in Ejina Basin and associated sedimentary dynamic environmental analysis

Ke Xie¹(), Hui Yin²()

^1.New Era University College，Kajang 43000，Malaysia
^2.School of Geography and Tourism，Huizhou University，Huizhou 516007，Guangdong，China

Received:2021-04-08 Revised:2021-07-13 Online:2021-11-20 Published:2021-12-17
Contact: Hui Yin

Abstract

Abstract:

The grain-size characteristics of sediments are of great significance for the analysis of regional sedimentary dynamic environment. In this study， we take the Ejina Basin as the research area， and uses the grain-size measurement results of the surface sediment samples collected from three main geomorphological units of the Gobi， riverbed and sand dunes as data source. Based on the analysis of grain-size parameters and end-member modeling analysis， the grain size characteristics， end-member composition and reflected sedimentary dynamic environment of sediments were analyzed. The results show that：（1） The grain size curve of the surface sediments in the Ejina Basin has a single-peak and multi-peak distribution. The Gobi and sand dune samples mainly include sandy sediment， and the riverbed samples mainly include sand and silty. （2） Surface sediments is decomposed into four main end-members. The main sediment of end-member 1 to end-member 4 are coarse silt， fine sand， medium-fine sand mixture and coarse-medium sand mixture in order. （3） End-member 1 of the surface sediments mainly represent a dynamic process dominated by flowing water； end-member 2 mainly represent the process of wind action and local topographic environment compounding； end-member 3 and end-member 4 are result of multiple external forces dominated by wind and local environment compounding.

Key words: Ejina Basin, grain-size characteristics, end-member modeling, sedimentary environment

CLC Number:

P515.2

Ke Xie, Hui Yin. The characteristic of grain-size in Ejina Basin and associated sedimentary dynamic environmental analysis[J]. Journal of Desert Research, 2021, 41(6): 111-119.

Figures/Tables 7

Fig.1 Location of study area and sampling points

Fig.2 Individual grain-size distributions of surface sediment samples from Ejina basin including their means

Table 1 Grain-size composition of surface sediment samples

类型	全部表层沉积物		戈壁沉积物		沙丘沉积物		河床沉积物
类型	均值	标准差	均值	标准差	均值	标准差	均值	标准差
粗砂（0—1 Φ）	15.486	14.794	13.397	12.758	25.163	16.701	8.206	10.287
中砂（1—2 Φ）	32.127	21.188	28.752	18.822	50.113	11.994	17.070	21.124
细砂（2—4 Φ）	32.878	20.430	39.657	21.601	21.947	15.236	27.844	14.092
粗粉砂（4—6 Φ）	11.453	15.691	9.933	10.480	1.491	2.359	29.958	22.450
细粉砂（6—8 Φ）	6.152	8.815	6.060	8.305	1.013	1.611	13.624	10.781
黏土（>8 Φ）	1.893	3.002	2.200	3.339	0.273	0.434	3.242	3.028

Fig.3 Characteristics of grain-size parameters of surface sediments

Fig.4 The results of end-member analysis of surface sediments

Fig.5 Spatial variations of the abundance of four end-members from surface sediments

Fig.6 The grain-size distribution of end-members from （A） Gobi samples，（B sand dunes samples and （C） riverbed samples

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The characteristic of grain-size in Ejina Basin and associated sedimentary dynamic environmental analysis

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