摘要
地球化学填图可为解决钴的资源和环境问题提供重要基础数据。深入理解沉积物中钴含量影响因素是科学利用钴地球化学填图数据的前提。本文基于华南—西秦岭地球化学走廊带钴等元素(指标)空间分布,利用相关性系数R、线性回归方程和地理加权回归方法系统评价不同因素对沉积物钴含量的影响。中—基性岩区和碎屑岩区源岩对沉积物钴含量具有主导作用。在碳酸盐岩区和酸性岩区,源岩-沉积物的局部拟合度和回归系数均降低,说明源岩对沉积物钴含量的相关性和贡献度减弱,富集系数提高和负的回归系数表明次生富集作用的影响占据主导。在碳酸盐岩和酸性岩区,铁锰氧化物和有机质对沉积物钴的次生富集影响显著,尤其在碱性条件下和强氧化条件下,氧化锰和有机质与钴的次生富集相关性达到R_(Mn)=0.54~0.63和R_(org)=0.75。引入地理加权回归方法研究不同地质背景区源岩对沉积物钴含量影响,进一步深化了水系沉积物钴含量影响因素的认识,为资源勘查和环境评价提供理论参考和基础支撑。
Geochemical mapping can provide significant basic data for solving problems such as cobalt resource and environmental influence.A thorough understanding of the factors influencing cobalt concentration in sediments is a prerequisite for scientific utilization of cobalt geochemical mapping data.Based on the spatial distribution of cobalt and other elements in the South China-West Qinling geochemical corridor,correlation coefficientR,linear regression equation and geographically weighted regression(GWR)were used to systematically evaluate the influence of different factors on the cobalt concentration in sediments.In intermediate-basic rock and clastic sedimentary rock region,the source rocks play a dominant role in the cobalt concentration within sediments.In carbonate and acidic rock regions,the local fitting degree and regression coefficient of source rock-sediment decrease,indicating that the correlation and contribution of source rock to sediments'cobalt content is weakened.The increase in enrichment coefficient and negative regression coefficient indicate that secondary enrichment become dominant factors.In carbonate and acidic rocks region,Fe-Mn oxides and organic matter have a significant effect on the secondary enrichment of cobalt in sediments;especially under alkaline conditions and strong oxidation conditions,the correlation between Mn-oxides and organic matter and secondary enrichment isR_(Mn)=0.54~0.63 andR_(org)=0.75.The geoweighted regression method is introduced to study the influence of source rocks in different geological backgrounds on the cobalt content in sediments,which further deepens the understanding of the influencing factors of the cobalt content in stream sediments,and provides theoretical support for resource exploration and environmental assessment.
作者
刘东盛
迟清华
王学求
聂兰仕
周建
刘汉粮
张必敏
王玮
徐善法
Liu Dongsheng;Chi Qinghua;Wang Xueqiu;Nie Lanshi;Zhou Jian;Liu Hanliang;Zhang Bimin;Wang Wei;Xu Shanfa(Key Laboratory of Geochemical Exploration,Institute of Geophysical and Geochemical Exploration(IGGE),Chinese Academy of Geological Sciences,Langfang,Hebei 065000,China;UNESCO International Centre on Global-scale Geochemistry(ICGG),Langfang,Hebei 065000,China)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2023年第5期1655-1669,共15页
Acta Geologica Sinica
基金
深部探测专项(编号Sinoprobe-04-05,201011057)
中国地质调查项目(编号助DD20221641、DD20190450、DD20190451)联合资助的成果。
关键词
钴
水系沉积物
岩石
铁锰氧化物
有机质
影响因素
cobalt
sediments
rocks
iron-manganese oxide
organic matter
influencing factors
