库布齐沙漠沉积物粒度及其对沉积环境的指示意义
Grain size of the Hobq Desert sediment and its indicating significance for the sedimentary environment
刘茜雅 1王海兵 2左合君 2郭建英1
作者信息
- 1. 中国水利水电科学研究院内蒙古阴山北麓草原生态水文国家野外科学观测研究站,北京 100038;水利部牧区水利科学研究所,内蒙古呼和浩特 010020
- 2. 内蒙古农业大学沙漠治理学院/内蒙古风沙物理与防沙治沙工程重点实验室,内蒙古 呼和浩特 010011
- 折叠
摘要
干旱区表层沉积物物质组成和地球化学特征对揭示物源、形成过程及沉积环境具有指示意义.采用粒度与全粒径分布参数对库布齐沙漠沉积物物源、成因及其作用过程进行了研究.结果表明:库布齐沙漠东部沉积物组分偏细,平均粒径为0.17 mm,全粒径分布参数C最大(755.66)μ和Dc最小(-0.36和0.10),西部北支沉积物居中,平均粒径为0.30 mm,全粒径分布参数居中,分别为537.91、-0.32和0.12;这两个区域风沙活动强烈,沉积物主要是以颗粒悬移和跃移远距离输移形成的风沙沉积物,以中等—高扰动递变悬浮沉积为主,组分高度混合,具有同源性.库布齐沙漠西部南支沉积物组分偏粗,平均粒径为0.29 mm,全粒径分布参数C最小(289.94)、μ和Dc最大(-0.15和0.25);西部南支沉积物为近源沉积,除风沙沉积物外,还有部分河流沉积物.
Abstract
The material composition and geochemical characteristics of surface sediments in arid areas are im-portant for revealing the source,formation process and sedimentary environment.The multi-index parameters of particle size and full particle size parameters reveal the differentiation characteristics of the origin,origin and ac-tion process of the Hobq Desert sediment in three regions,which were shown as follows:The sediment in the eastern part of the Hobq Desert was thin,with a mean particle size of 0.17 mm,the largest full particle size dis-tribution parameter C(755.66),the smallest μ and Dc values(-0.36 and 0.010);The sediment in north branch of the west was middle,the average particle size was 0.30 mm,and the full particle size distribution parameters was 537.91,-0.32 and 0.12,respectively;These two areas have strong sand activity,and sediments are mainly wind sand sediments formed by long-distance transfer of particle suspension and transition,mainly medium-high disturbance and recursive suspension deposition,and sediment components are highly mixed with homology.The sediment component of the south branch of the west was coarse,with an average particle size of 0.29 mm,the smallest full-grain diameter distribution parameter C(289.94),and the largest μ and Dc values(-0.15 and 0.25),including some river sediments.
关键词
沉积物/粒度/沉积环境/库布齐沙漠Key words
sediment/grain size/depositional environment/Hobq Desert引用本文复制引用
出版年
2024
NETL
NSTL
万方数据