Variation of modes of occurrence of elements in soil before and after the geo-electrochemical extraction in eolian sand covered area
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摘要: 在洛恪顿铅锌多金属矿5勘探线地电化学勘查剖面上采集了电提取前后的土壤样品,开展了全量及顺序提取"七步法"分析测试,对比结果表明:地电化学过程所提取的元素是以多种相态存在于土壤介质中的,以水溶态、离子交换态、碳酸盐结合态等活性相态为主,同时颗粒较小的弱活性相态,甚至残渣态颗粒也可被电化学过程所迁移、吸附;电提取后,土壤中多数元素某一种或几种相对活性相态含量与矿体产生了极好的空间对应关系;较浅的运积物覆盖层及深部有矿体或矿化体存在,可导致电提取后土壤中多数微量金属元素全量显著增加,这表明地电化学方法在运积物覆盖区具有较大的勘查适用性.Abstract: In this study,soil samples before and after geo-electrochemical extraction were collected along the fifth exploration line of the Luokedun lead-zinc polymetallic mining area. Total content and chemical speciation of'seven steps method'were analyzed for 20 el-ements. Some conclusions have been reached:Elements extracted by geo-electrochemical process exist in a variety of phases in soil. The active phases including water soluble,exchangeable and carbonate bound phases are the mainly components,while micro-particles that exist in low active phases including residues can also be migrated and adsorbed by this process. Spatial distribution of element val-ues of some active phases in soil appear to be highly consistent with spatial position of the orebody after geo-electrochemical extraction. Factors such as low depth transported overburden and orebody or mineralized body beneath the cover can lead to a significant increase of total content in soil for the majority of metal elements after the extraction process. Such phenomena indicate that the method of geo-electrochemistry has great applicability in the transported overburden area.
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