文献类型：期刊文献

中文题名：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

英文题名：Spatial variations in grain size and constant elements of dune surface sediments in the Badain Jaran to Ulan Buh Desert sand transport belt

作者：杨岩岩[1] 刘连友[2] 吴波[1] 陈曦[3] 庞营军[1]

第一作者：杨岩岩

机构：[1]中国林业科学研究院生态保护与修复研究所,北京;[2]北京师范大学地理科学学部,北京;[3]中国农业大学水利与土木工程学院,北京

年份：2026

卷号：62

期号：1

起止页码：38-49

中文期刊名：北京师范大学学报(自然科学版)

外文期刊名：Journal of Beijing Normal University(Natural Science)

收录：;北大核心:【北大核心2023】；

基金：科技基础资源调查专项资助项目(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);国家重点研发计划项目(2022YFD190050402)。

语种：中文

中文关键词：巴丹吉林—乌兰布和沙漠输沙带;粒度;常量元素;空间分异

外文关键词：Badain Jaran and Ulan Buh Desert sand transport belt;grain size;constant elements;spatial variation

分类号：X144;P931.3;P596

摘要：巴丹吉林-乌兰布和沙漠输沙带是巴丹吉林沙漠向乌兰布和沙漠输送沙物质的通道.以往研究对该输沙带沉积物理化性质的关注较少.本文沿该输沙带走向,系统采集了输沙带沙丘表层沉积物样品,分析了沉积物的粒度和常量元素的空间分异特征.结果表明:1)巴丹吉林-乌兰布和沙漠输沙带沙丘表层沉积物以中砂为主,细砂次之,平均粒径为1.66Φ.2)输沙带沙丘表层沉积物常量元素以SiO_(2)和Al_(2)O_(3)为主.与上部陆壳相比,除SiO_(2)和MnO表现为富集外,其他元素均相对亏损.矿物成熟度高于巴丹吉林沙漠.3)输沙带沙丘表层沉积物的中砂、细砂和粗砂分别对SiO_(2)、K_(2)O和MnO的富集贡献显著;输沙带沉积物粒度的变化与常量元素富集亏损度的变化具有空间一致性.4)沿主导风向,输沙带沙丘表层沉积物有明显细化趋势;SiO_(2)质量分数呈现明显减少趋势,Al_(2)O_(3)、CaO、K_(2)O和Na_(2)O的质量分数呈现显著增加趋势;矿物成熟度呈不显著降低趋势;输沙带沙丘表层沉积物粒径大于上风向巴丹吉林沙漠,反映出输沙带沉积物在从巴丹吉林沙漠搬运过程中可能汇入了局地河道或山前冲洪积物等本地源.研究结果将为阿拉善高原沙漠的形成演化和风沙地貌过程的研究提供科学依据.
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 SiO_(2)and Al_(2)O_(3).Compared to the upper continental crust,except for SiO_(2)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 SiO_(2),K_(2)O,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,SiO_(2)content shows a significant decreasing trend,while Al_(2)O_(3),CaO,K_(2)O,and Na_(2)O 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.