贵州灰家堡金矿田土壤重金属元素环境地球化学评价

为了解灰家堡金矿田土壤重金属元素环境地球化学背景和现状,本文开展了土壤重金属（As、Cd、Cr、Cu、Hg、Ni、Pb、Zn）环境质量评价。结果显示,以《土壤环境质量农用地土壤污染风险管控标准》中风险筛选值为标准,灰家堡金矿田大部分区域土壤As和Cu环境地球化学等级高（三级、四级和五级）,其它重金属元素（Cd、Cr、Hg、Ni、Pb、Zn）环境地球化学等级低（一级和二级）。高土壤Cu环境地球化学等级（三级）的区域与已知的构造、地层和深部隐伏Au矿体均无空间关系。土壤中Cu的来源主要受地层背景含量的控制。高土壤As环境地球化学等级（三级、四级和五级）的区域主要沿背斜轴和断裂呈带状分布,并与深部矿体相对应,但与已有矿山生产活动区无空间关系。灰家堡金矿田高As环境地球化学等级的土壤与Au的成矿作用有关。

Environmental Geochemistry Assessment of Heavy Metals in Soil at the Huijiabao Au Mine Field in Guizhou, China

In this study, soil environmental geochemistry survey and evaluation of heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb, Zn) at the Huijiabao Au mine field, Guizhou province, China, was conducted to understand the geochemical background and contamination status. The results showed that most of the soils are of high As and Cu environmental geochemistry grades (third, fourth, and fifth grade) base on the risk screening values in "agricultural land environmental quality standards of soil pollution risk control". Other heavy metal elements (Cd, Cr, Hg, Ni, Pb, Zn) showed low soil environmental geochemistry grades (first and secondary grade). The areas with high soil Cu environmental geochemistry grades (third grade) showed no spatial correspondence relationships with strata, faults, and deep concealed Au orebodies. The origin of Cu in soil is mainly from the rocks in the mine field. The areas with high soil As environmental geochemistry grades (third, fourth, and fifth grade) were distributed along the anticlinal axis and related fault zones and displayed high relationships with deep concealed orebodies. In addition, it shows on spatial correspondence relationships with the existing mining areas. High As soil at the Huijiabao gold mine field was a result of the Au mineralization.