淮河流域颍河上游河谷沉积物物源分析  

Provenance Analysis of Sediments in the Upper Reaches of the Yinghe River in the Huaihe River Basin

作　　者：王兆夺 黄春长 周亚利 查小春 庞奖励 尚瑞清 WANG Zhaoduo;HUANG Chunchang;ZHOU Yali;ZHA Xiaochun;PANG Jiangli;SHANG Ruiqing(Geological Hazards Prevention Institute,Gansu Academy of Sciences,Lanzhou 730000,China;School of Geography and Tourism,Shaanxi Normal University,Xi'an 710016,China)

机构地区：[1]甘肃省科学院地质自然灾害防治研究所,兰州730000 [2]陕西师范大学地理科学与旅游学院,西安710016

出　　处：《地球与环境》2024年第4期420-428,共9页Earth and Environment

基　　金：国家自然科学基金项目(42171092);甘肃省科学院科研启动基金项目(QD202304)。

摘　　要：通过详细的野外考察,在淮河流域颍河上游的河谷地段见到具有典型代表性的完整沉积剖面,进一步对其进行野外宏观分层描述并每隔2 cm进行高分辨率采样,带回实验室进行分析。采用粒度端元分析手段,分析了地层剖面的物源问题。分析结果表明:本区黄土物源和黄土高原典型黄土有所不同,区域东北风作用下近源的风沙流沉积物占了相当份额;依据粒度端元分析,沉积动力组分主要由3部分组成,分别代表了风化成壤改造作用下的产物、东亚冬季风作用下从西北荒漠搬运而来的粉尘物质以及东北风作用下从近源搬运而来的黄泛沉积物;在不同的时期,沉积作用动力强弱有明显的变化,表明了全新世以来区域季风气候对全球气候变化的响应过程。研究对淮河流域颍河上游局部河谷沉积物物源组成特点进行了量化分析,这对于深入理解淮河上游沉积物物源及全新世以来其季风作用下的地表过程演变特征具有重要的科学意义。Through detailed field investigations,a complete and representative sedimentary profile was discovered in the upper reaches of the Yinghe River in the Huaihe River Basin.Macroscopic stratification and high-resolution sampling were conducted at 2 cm intervals in situ;the samples were brought back to the laboratory for analysis.End-Member Modeling Analysis was used to analyze the provenance of the sedimentary profile.The results indicate that the source of loess in this area was different than that of typical loess in the Loess Plateau,with a significant proportion of sediment deposited by the influence of the northeast wind near the source area.According to End-Member analysis,the sediments were mainly composed of the dust material transported from the northwest desert under the influence of the East Asian winter monsoon,and sediment from the Yellow River transported nearby under the action of the Northeast wind.The sedimentary dynamics vary noticeably over different time periods,reflecting the response of regional monsoon climate to global climate change since the Holocene.This study quantitatively analyzes the characteristics of sediment provenance in the local river valley deposits of the upper Ying River in the Huai River Basin,providing important scientific insights into how the monsoon climate has influenced the surface processes since the Holocene.

关 键 词：淮河流域 颍河上游 黄土古土壤 全新世 物源分析 

分 类 号：P512.2[天文地球—地质学]