若尔盖盆地黄河辖曼段河岸沉积物成因判别  

Identification of the sediments on the riverbank of the Yellow River in the Xiaman reach of the Zoige Basin

作　　者：柴佳楠 查小春 黄春长 周亚利 庞奖励 张玉柱 王娜 炊郁达 戎晓庆 尚瑞清 CHAI Jia-nan;ZHA Xiao-chun;HUANG Chun-chang;ZHOU Ya-li;PANG Jiang-li;ZHANG Yu-zhu;WANG Na;CUAN Yu-da;RONG Xiao-qing;SHANG Rui-qing(National Experimental Teaching Demonstration Center,School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China;Key Laboratory of Earth Surface System and Environmental Carrying Capacity,College of Urban and Environmental Science,Northwestern University,Xi'an 710127,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth and Environment Research,Chinese Academy of Sciences,Xi'an 710075,China)

机构地区：[1]陕西师范大学地理科学与旅游学院,地理学国家级实验教学示范中心,西安710119 [2]西北大学城市与环境学院,陕西省地表系统与环境承载力重点实验室,西安710127 [3]中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,西安710075

出　　处：《兰州大学学报（自然科学版）》2021年第5期600-607,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(41971116,41801060)。

摘　　要：选取若尔盖盆地黄河辖曼段西仓村河岸典型的沉积剖面进行分层采样,通过沉积物粒度和端元分析,发现该剖面全新世沉积物主要由全新世中期以来堆积的河流沙、泥沼土、风成沙、古土壤与现代土壤等类型的沉积物构成.按照其沉积顺序自下而上依次为:新近纪古老的坚硬黏土;由高原面强劲风力搬运沉积的细沙质风成沙;古湖滨浅洼地积水沼泽沉积的淤泥和泥炭;河漫滩沉积物及其经过风力改造形成的较厚风成沙;浅洼地积水沼泽沉积的淤泥与风沙互层;沙尘暴过程堆积的粗粉沙经过生物化学风化成壤改造形成古土壤;风力作用形成的细沙质风成沙;沙尘暴过程堆积的粗粉沙经过生物化学风化成壤改造形成的现代亚高山草甸土壤.Based on a detailed investigation of the Zoige Basin,the typical sedimentary profile of the riverbank of Xicang Village in the Xiaman Section of the Yellow River was selected for stratified sampling.An analysis of the sediment properties by grain-size and End Member showed that the Holocene sediments were mainly composed of fluvial sand,peat soil,eolian sand,paleosol and modern soil sediments had accumulated since the middle of the Holocene.According to the sedimentary sequence from the bottom to top in the profile,the sediments in the profile were,successively,old hard clay of the Neogene,fine sandy aeolian sand deposited by strong winds on the plateau,silt and peat soil deposited by waterlogged swamps in shallow lowlands of the ancient lakeside,floodplain sand and thicker aeolian sand formed by the wind transformation,silt deposited by waterlogged swamps in shallow depressions,the Paleosol formed by biochemical weathering of coarse silt accumulated during dust storms,fine sandy aeolian sand formed by wind action,and modern subalpine meadow soil transformed by biochemical weathering from coarse silt accumulated during sandstorm.

关 键 词：沉积物性质 黄河 若尔盖盆地 

分 类 号：K903[历史地理—人文地理学]