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
郑丽超 1张洪瑞 2韩伟鹏 1宋超 1罗迪柯 2蔡磊光 1张超 1刘长友 1柳军 1赵博1
作者信息
- 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
- 折叠
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SiO2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、K2O含量略高.
Abstract
Angola,located on the southwestern edge of the ancient Congo Craton,boasts rich mineral re-sources.This study focuses on the eastern part of Angola(the region covered by Cenozoic sediments)to in-vestigate 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 SiO2 and Au,the concentrations of all other components were generally below the background val-ues 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 ele-ments,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 K2O 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Key words
sediment coverage area/soil geochemical survey/particle size test/eastern Angola引用本文复制引用
出版年
2024
NETL
NSTL
万方数据