石英ESR法在黄河现代沉积物物源示踪研究中的可行性分析  

Feasibility analysis of quartz Electron Spin Resonance method in tracing provenance of modern sediments in the Yellow River

作　　者：汪丽君 陈洪云[1] 赖忠平 杨振京[1] WANG Lijun;CHEN Hongyun;LAI Zhongping;YANG Zhenjing(Institute of Hydrogeology and Environment Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,China;Institute of Marine Sciences,Shantou University,Shantou 525063,China)

机构地区：[1]中国地质科学院水文地质环境地质研究所,石家庄050061 [2]汕头大学海洋科学研究院,汕头525063

出　　处：《地球环境学报》2020年第2期181-189,共9页Journal of Earth Environment

基　　金：中国地质科学院基本科研项目(SK201607);中国地质调查局地质调查项目(DD20189262)。

摘　　要：石英ESR信号示踪法作为一种新的物源示踪方法,已经被较好地应用于东亚地质历史时期风尘堆积物和现代沙尘沉降物的物源示踪研究中。首先简要回顾了石英ESR信号示踪法的研究现状,进一步基于石英ESR信号示踪法的母岩年代和结晶度原理,探讨该方法对黄河沉积物物源示踪的可行性及应用前景。Background,aim,and scope As a new provenance tracing method,electron spin resonance (ESR) signal intensity and crystallinity index (CI) of quartz were widely used in tracing the material sources of marine dust,Asian dust and loess.Firstly,the present researches about the ESR provenance tracer were briefly reviewed.Based on this,we take the Yellow River Basin as the research area to analyze the feasibility of quartz ESR method to trace modern Yellow River sediments.Materials and methods As one of the most common and abundant minerals on the earth,the quartz has been selected to study material owing due to its stability in the process of weathering,denudation and sedimentation,which may preferably save the primitive character of the host rocks.ESR signal intensity of the ■centre (an indication of the age of the host rock) and CI (an index reflecting the formation condition of the mineral such as temperature and crystallization speed) of quartz have been tested for the provenance identification.Results Based on the application successes and feasibility analysis on provenance of the marine sediments,Asian dust and loess,the provenance tracing the Yellow River will be proposed by the method of the ESR and CI.Discussion If the method of ESR and CI could successful trace the identification of the Yellow River sediments,the following chief characters should be needed:(1) the stability of the chose object (keeping the primitive character in the process of the physical and chemical weathering);(2) identification of provenance tracer (having the obvious identification in rock age and formation condition);(3) the stability of provenance material (having the preferably supply relation between the provenance and deposition);(4) the accessibility of sediments (having the unanimous mixed sediments among the main steam and other branches).Conclusions Compared with the provenance tracer of eolian sediments,the provenance of the river sediments had more spatial cause and temporal variability.The paper discussed the feasibility of

关 键 词：石英 ESR信号强度 河流沉积物 物源示踪 

分 类 号：P512.2[天文地球—地质学] P59