砂砾质地表不同粒径颗粒地球化学特征分析  

Geochemical Analysis of Different Particle Sizes on the Surface of Sand and Gravel

作　　者：刘娜娜 王海兵 左合君 熊鑫 王国林 LIU Nana;WANG Haibing;ZUO Hejun;XIONG Xin;WANG Guolin(Key Laboratory of Inner Mongolia Autonomous Region for Wind and Sand Physics and Sand Control Engineering,School of Desert Management,Inner Mongolia Agricultural University,Hohhot 010011,China;Wurathou Banner Management Station of Mongolian Wild Donkey National Nature Reserve,Bayan Nur 015500,China)

机构地区：[1]内蒙古农业大学沙漠治理学院,内蒙古自治区风沙物理与防沙治沙工程重点实验室,内蒙古呼和浩特010011 [2]乌拉特梭梭林蒙古野驴国家级自然保护区乌拉特后旗管理站,内蒙古巴彦淖尔015500

出　　处：《环境科学与技术》2020年第2期21-26,共6页Environmental Science & Technology

基　　金：国家重点研发计划:乌兰布和沙漠生态园区沙产业技术和模式集成与示范(2016YFC0501009)。

摘　　要：风沙运动造成地表沉积物组分发生改变,伴随其沉积物地球化学特征发生改变。选取苏宏图洪积扇扇缘戈壁、沙积洼地地表沉积物,基于X射线衍射仪、扫描电镜能谱仪进行其不同组分矿物、地球化学元素测试。结果表明:风沙运动导致不同地表沉积物的风蚀和风积情况不同,但其均处于化学风化的初、中级阶段,具有相似性;该砂砾质地表不同粒径组分以石英、长石、云母、方解石等矿物为主,各沉积物组分矿物衍射峰强具有显著差异性;该区域不同粒径颗粒化学元素组成以SiO2、Al2O3、Fe2O3为主,约占总含量的85%左右,沉积物颗粒粒径越大,SiO2含量越多,Fe2O3、MgO、CaO、TiO2等氧化物表现为在细颗粒组分中富集,而Al2O3、K2O、Na2O等随颗粒粒径变化无显著差异。Wind and sand movement changes the composition of surface sediments,and changes the geochemical characteristics of sediments.The surface sediments of Gobi and Shaji depression on the edge of the alluvial fan in Suhongtu are selected to test the minerals and geochemical elements of different components based on the X-ray diffractometer and SEM energy spectrometer.The results show that wind erosion and wind deposition are different in different surface sediments due to windsand movement,but they are in the initial and intermediate stages of chemical weathering and are similar.Quartz,feldspar,mica,calcite and other minerals are the main components of the gravel surface with different grain sizes.The chemical elements in this area are mainly SiO2,Al2O3 and Fe2O3,accounting for about 85%of the total.The larger the particle size is,the more SiO2 content is.Fe2O3,MgO,CaO,TiO2 and other oxides are enriched in the fine particles,while Al2O3,K2 O and Na2 O have no significant difference with the particle size.

关 键 词：沉积物 风沙运动 组分 地球化学特征 

分 类 号：X142[环境科学与工程—环境科学]