中国北方沙漠河岸沙丘地球化学特征及其物源指示意义  

Geochemical features and their implication of provenances of riparian dunes in the northern China deserts

作　　者：李小妹 刘小糠 严平 董苗 LI Xiaomei;LIU Xiaokang;YAN Ping;DONG Miao(School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China;State Key Laboratory of Earth Surface Processes and Resource Ecology,Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China;Institute of Geographical Science,Taiyuan Normal University,Jinzhong 030619,Shanxi,China)

机构地区：[1]School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China [2]State Key Laboratory of Earth Surface Processes and Resource Ecology,Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China [3]Institute of Geographical Science,Taiyuan Normal University,Jinzhong 030619,Shanxi,China

出　　处：《Journal of Geographical Sciences》2023年第9期1921-1938,共18页地理学报（英文版）

基　　金：National Natural Science Foundation of China,No.41871010,No.41901094,No.41801004;The Second Comprehensive Scientific Expedition to the Qinghai-Tibet Plateau,No.2019QZKK0906。

摘　　要：Rivers in deserts present unique geographical features owing to aeolian-fluvial interactions.In this study,510 surface sediment samples were gathered from eight watersheds to systematically examine the major element characteristics of riparian sand dunes in northern China deserts.The findings revealed that these dunes could be categorized into three primary zones:Type I,comprising Keriya,Tora,Heihe,and Langqu rivers in the west;TypeⅡ,featuring the Maquan River in the Tibetan Plateau;and TypeⅢ,including Mu Bulag,Kuye,and Xar Moron rivers in the east.Specifically,the TypeⅢregion is characterized by a limited fresh material supply,a relatively high Chemical Index of Alteration(CIA),and the influence of nearby rivers on the provenance of riparian dunes,leading to a higher degree of chemical weathering than that of TypeⅠin the west.Notably,TypeⅡis marked by weak-moderate chemical weathering degree and a comparatively higher CIA value.These classifications and their difference of degree of chemical weathering are possibly governed by the type of parent rock and the availability of material.This research offers new insights into the classification of riparian dunes impacted by aeolian-fluvial interactions in arid regions of the northern China deserts.Furthermore,it provides valuable implications for studies focusing on the provenance of sediments.

关 键 词：physicochemical characteristics surface sediments DESERT riparian dunes aeolian-fluvial interactions 

分 类 号：P931.3[天文地球—自然地理学] P59