土壤地球化学测量在安哥拉东部沉积物覆盖区的应用  

Application of soil geochemical survey in the sediment-covered area of eastern Angola

作　　者：郑丽超 张洪瑞 韩伟鹏 宋超 罗迪柯 蔡磊光 张超 刘长友 柳军 赵博 ZHENG Lichao;ZHANG Hongrui;HAN Weipeng;SONG Chao;LUO Dike;CAI Leiguang;ZHANG Chao;LIU Changyou;LIU Jun;ZHAO Bo(Hebei Institute of Geophysical Exploration(Hebei Shallow Geothermal Energy Research Center),Langfang 065000,Hebei,China;Citic Construction Co.,Ltd.,Beijing 100027,China)

机构地区：[1]河北省地球物理勘查院(河北省浅层地热能研究中心),河北廊坊065000 [2]中信建设有限责任公司,北京100027

出　　处：《矿产与地质》2024年第6期1001-1014,共14页Mineral Resources and Geology

摘　　要：安哥拉位于古老的刚果克拉通西南边缘,拥有丰富的矿产资源。以安哥拉东部(新生代沉积物覆盖区)作为研究对象,开展土壤地球化学测量技术研究。确定-80目粒级的土壤样品质量占比最高,-60~+80目粒级的土壤样品质量占比最低;除SiO_(2)和Au,各组分含量普遍低于安哥拉西北部水系沉积物的背景值;40~50 cm为最佳采样层位,-80目为最佳粒级;铁铝土“三稀”元素、放射性元素、部分有色金属元素明显富集,砂质土内Au表现出强烈的亲铁性,与亲铁元素同步富集;潜育土内仅Cs、K_(2)O含量略高。Angola,located on the southwestern edge of the ancient Congo Craton,boasts rich mineral resources.This study focuses on the eastern part of Angola(the region covered by Cenozoic sediments) to investigate soil geochemical measurement techniques.The highest proportion of soil samples was found to have a grain size of-80 mesh,while the lowest was observed in samples with a grain size of-60 to +80 mesh.Excluding SiO_(2) and Au,the concentrations of all other components were generally below the background values of stream sediments in northwest Angola.The optimal sampling depth was identified as 40-50 cm,with-80 mesh being the most suitable grain size for analysis.Notably,‘three rare' elements,radioactive elements,and certain non-ferrous metals within iron bauxite exhibited significant enrichment.In sandy soils,Au demonstrated a strong affinity for iron,co-enriching with ferrophilic elements.Only the contents of Cs and K_(2)O in gleyed soil were marginally higher.

关 键 词：沉积物覆盖区 土壤地球化学测量 粒级试验 安哥拉东部 

分 类 号：P632[天文地球—地质矿产勘探]