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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 I: methodologies and field investigation atthe Marsh Zone gold property*
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Redox, pH and SP variation over mineralization in thick glacial overburden. Part I: methodologies and field investigation atthe Marsh Zone gold 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。第一部分：沼泽区金矿的方法和现场调查*

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A surface and subsurface investigation of pH, oxidation–reduction potential (ORP) and spontaneous potential (SP) was carried out over sulphide-hosted gold mineralization in an area of thick and extensive glacially derived overburden. Protocols were developed to measure ORP and pH in clay slurries, peat and groundwater to test for the presence of redox and pH phenomena that were predicted to occur over mineralization. ORP protocols focused on removing memory effects caused by probe history and storage and on obtaining a reproducible measure of the ORP over mineralization relative to background areas. The results confirm the presence of distinct reduced ‘columns’ in clay and interstitial groundwater overlying sulphide mineralization that are in fact reduced ‘curtains’ that follow the trace of mineralization. These are accompanied by high pH within the reduced column, with minor lows on the flanks, and elevated H2S and CO2 in shallow groundwater over mineralization. Whereas the H2S appears to have its source in bedrock mineralization, the CO2 is likely a secondary near-surface phenomenon related to oxidation of metals in the reduced column, which produces acid and concomitant dissolution of carbonate in the clays. Wide groundwater temperature anomalies are spatially associated with mineralization. High ORP in shallow peat above mineralization may be evidence of an ‘oxidized cap’ over the reduced column. A minor SP response in surface peat was noted but is small in comparison to the redox field voltage. The presence of reduced columns and other features are consistent with a previously published redox-gradient transport model.
机译：在厚壁 sup> 区域的硫化物基质金矿化过程中，进行了pH，氧化还原 电位（ORP）和自发电位（SP）的表面和地下研究。 sup> 和大量的冰川覆盖层。开发了 协议以测量粘土，泥炭和地下水中的ORP和pH 以测试 预测是否存在氧化还原和pH现象发生在矿化上。 ORP协议 专注于消除由探针历史记录和存储引起的记忆效应，并且针对相对于背景区域的矿化获得可再现的ORP度量。结果证实，粘土和填隙性地下水中覆盖着硫化物矿化的黏土和间隙 中存在明显的 ，而实际上 还原后的“幕” 伴随着还原柱内的高pH， ，侧面的低位，H 2 S和成矿作用下浅层 地下水中的CO 2 。 H 2 S似乎具有 其源于基岩矿化，而CO 2 很可能 还原柱中 金属氧化相关的表面现象，产生酸并伴随碳酸盐在粘土中溶解。广泛的地下水温度 异常在空间上与矿化有关。在矿化之上浅层泥炭中高 ORP可能是还原柱上方 “氧化盖”的证据。注意到表面泥炭中较小的 SP响应，但与氧化还原场电压相比 小。减少的列 和其他功能的存在与以前发布的 氧化还原梯度传输模型一致。

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