北京师范大学学报（自然科学版）2026，Vol.62Issue(1)：38-49,12.DOI:10.12202/j.0476-0301.2025149
巴丹吉林—乌兰布和沙漠输沙带沙丘表层沉积物粒度和常量元素空间分异特征
Spatial variations in grain size and constant elements of dune surface sediments in the Badain Jaran to Ulan Buh Desert sand transport belt
摘要
Abstract
A corridor exists for the transport of aeolian sediments from Badain Jaran Desert to Ulan Buh Desert,but little attention has been paid to the physicochemical properties of the sediments in previous studies.Surface samples were collected in this work from crests of sand dunes along the sand transport belt,with sampling alignment following both prevailing wind direction and orientation of the sand transport belt,grain size composition and constant element contents of the samples were then measured and analyzed.The surface sediments are found to be mainly composed of medium sand,followed by fine sand,with an average particle size of 1.66Φ.The sediments exhibit good sorting,with a positively skewed and moderately peaked distribution.The constant elements in the surface sediments are primarily SiO2 and Al2O3.Compared to the upper continental crust,except for SiO2 and MnO showing enrichment,all other elements are deficient.The mineral maturity of surface sediments in sand dunes is higher than the Badain Jaran Desert.Medium sand,fine sand,and coarse sand in the surface sediments of sand dunes in BJD-UBD contribute significantly to the enrichment of SiO2,K2O,and MnO.Spatial consistency is observed in variations of grain size and major element enrichment/deficiency.Along the prevailing wind direction,surface sediments in the sand transport belt exhibit a clear trend of fining.Concurrently,SiO2 content shows a significant decreasing trend,while Al2O3,CaO,K2O,and Na2O contents increase significantly.In contrast,mineral maturity displays a non-significant decreasing trend.The surface sediments of sand dunes in the sand transport belt are coarser than the upwind Badain Jaran Desert,indicating that local sediment sources such as regional river channels or alluvial deposits from foothill floodplains may have contributed to the sedimentation of the sand transport belt during its migration from the Badain Jaran Desert.These data provide some scientific basis for the study of formation and evolution of deserts,and the process of wind and sand landforms in the Alxa Plateau.关键词
巴丹吉林—乌兰布和沙漠输沙带/粒度/常量元素/空间分异Key words
Badain Jaran and Ulan Buh Desert sand transport belt/grain size/constant elements/spatial variation分类
资源环境引用本文复制引用
杨岩岩,刘连友,吴波,陈曦,庞营军..巴丹吉林—乌兰布和沙漠输沙带沙丘表层沉积物粒度和常量元素空间分异特征[J].北京师范大学学报（自然科学版）,2026,62(1):38-49,12.基金项目
科技基础资源调查专项资助项目(2022FY202302) （2022FY202302）
中央级公益性科研院所基本科研业务费专项资助项目(CAFYBB2025ZA00603) （CAFYBB2025ZA00603）
国家重点研发计划项目(2022YFD190050402) （2022YFD190050402）
