地球化学响应敏感指标优选方法:以安徽贵池地区为例  

Optimization of geochemical response sensitive indexes in Guichi area,Anhui Province

作　　者：梁胜跃[1,2] 罗传根 徐明钻 刘建东 祁超[1] 陈峰[1] 方彦奇[2] 金志鹏[1] Liang Shengyue;Luo Chuangen;Xu Mingzuan;Liu Jiandong;Qi Chao;Chen Feng;Fang Yanqi;Jin Zhipeng(Geological Exploration Technology Institute of Jiangsu Province,Nanjing 210049,Jiangsu,China;Technology Research Center of Airborne Detecting of JSGM,Nanjing 210049,Jiangsu,China)

机构地区：[1]江苏省地质勘查技术院,江苏南京210049 [2]江苏省地质矿产勘查局航空对地探测技术研究中心,江苏南京210049

出　　处：《地质学刊》2022年第1期48-59,共12页Journal of Geology

基　　金：江苏省耕地污染防治项目“江苏省灌河沿线及长江北岸耕地污染快速调查与修复方法研究试点”(苏财建[2017]123号-201807017)。

摘　　要：当前能够分析的地球化学成分众多,如何从诸多成分中快速有效地优选出有价值的地球化学指标是长期致力研究的重要内容。以安徽贵池为研究区,将元素含量空间分布特征量化,探讨54种成分的土壤地球化学响应特点,基于背景对照系数、变异系数、表生富集系数、土壤类型变化系数4个关键参数,研究量化方式,采用平均值法和标度法分别讨论综合地球化学响应系数的计算方法。优选出25项地球化学响应敏感指标,其中,Au、Ag、Pb、Hg、Zn、Mo、S、Mg、F、I等敏感指标反映研究区成矿地质条件良好,Cd、As、Pb、Hg、Ba、Sb等敏感指标指示研究区土壤存在不同程度污染,I、Mo、N、S、P、Corg等敏感指标指示土壤营养状况总体较好、研究区具有富硒土壤潜力。结果表明,综合地球化学响应系数可以较快速准确地从数十种成分中优选出敏感地球化学指标。At present,there are many geochemical components that can be analyzed.How to quickly and effectively select valuable geochemical indexes from these components has been an important research topic for a long time.Taking Guichi of Anhui Province as an example,with the spatial distribution quantification on elements'contents,this paper discussed the soil geochemical response features of 54 components.Based on 4 key parameters including background value contrasting coefficient,coefficient of variation(C_(V)),supergene enrichment ratio and elements'content variation ratio between different types of soil,the quantitative method was studied,and the calculation method of comprehensive geochemical response coefficient was discussed using methods of averaging and scaling.It is found that,among the selected 25 sensitive indexes of geochemical response,Au,Ag,Pb,Hg,Zn,Mo,S,Mg,F,I and other sensitive indicators reflect good metallogenic geological conditions in the study area,while Cd,As,Pb,Hg,Ba,Sb and other sensitive indicators show different degrees of soil pollution,and I,Mo,N,S,P,organic carbon and other sensitive indicators show good soil nutrition and potentially selenium-rich soil.It is proved that comprehensive geochemical response coefficient can be used to select sensitive geochemical indexes from dozens of components quickly and accurately.

关 键 词：地球化学响应 指标优选 多目标地球化学 数据挖掘 安徽贵池 

分 类 号：P595[天文地球—地球化学]