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首页> 外文期刊>Geochemistry: Exploration, Environment, Analysis >Redox, pH and SP variation over mineralization in thick glacial overburden. Part II: field investigation at Cross Lake VMS property*
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Redox, pH and SP variation over mineralization in thick glacial overburden. Part II: field investigation at Cross Lake VMS property*

机译：在厚厚的冰川覆盖层中，氧化还原，pH和SP随矿化而变化。第二部分：克罗斯湖VMS物业的现场调查*

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An investigation of surface and subsurface redox and electrical field conditions was carried out over a volcanogenic massive sulphide (VMS) deposit in thick glacial clay and sand terrain of the Abitibi clay belt of northeastern Ontario. Thirty-seven boreholes were drilled to 9 m depth on two lines crossing the strike of mineralization and were completed in either sand or clay. An additional three were drilled 30 to 50 m and completed in bedrock. Monitoring wells were installed in all holes and groundwater was later sampled. A variety of oxidation–reduction potential (ORP) and spontaneous potential (SP) techniques were used, the methodologies for which were introduced earlier and are further developed here. The best definition of redox conditions was obtained by ORP measurement of clay and sand slurries from split-spoon samples collected and analysed during the drilling programme. Related techniques included groundwater ORP and down-hole platinum-SP (PtSP) testing, the latter measuring total potential field, which is the sum of the electrical and electrochemical components of voltage. Although the performance of the methods differed, the results consistently show chemically reduced areas (reduced ‘columns’) in the phreatic zone above mineralization with overlying acidic ‘caps’ in the vadose zone. Other features noted over mineralization include carbonate remobilization, partial extraction metal anomalies in shallow soils, CO2 enrichment in groundwater, and elevated groundwater temperature. These varied features are related and provide evidence for upward transport of reduced species from mineralization. They agree well with phenomena predicted in a previously published redox-gradient transport model.
机译：在厚的冰川粘土和砂质地形中，对一个火山成因的硫化物（VMS）沉积物进行了表面和地下氧化还原作用以及电场条件的研究。 >位于安大略省东北部的Abitibi粘土带。在横跨矿化走向的两条线上钻了37个 钻孔，深度为9 m，并在沙子或 粘土中完成。另外三口钻了30至50 m，并在基岩中完成了 。将监测井安装在所有孔中，随后对 地下水进行采样。 使用了各种氧化还原 势能（ORP）和自发势能（SP），其方法学在较早之前已经介绍过，并且 在这里进一步发展。氧化还原条件 的最佳定义是通过对 程序中收集和分析的 分离勺样品中的粘土和砂浆进行ORP测量获得的。相关技术包括地下水ORP和井下 铂SP（PtSP）测试，后者用于测量总电势 场，即电势和电势之和。 电压分量。尽管方法 的性能有所不同，但结果始终显示矿化上方的深水区 （减少的“柱”）的化学还原面积（上覆） 矿化中提到的其他特征包括碳酸盐固结，浅层土壤中的 部分提取金属异常，CO 2 富集 在地下水中，以及地下水温度升高。这些 的变化特征是相关的，并为矿化还原物种向上 的运输提供了证据。他们 与先前发布的氧化还原梯度 运输模型中预测的现象非常吻合。

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