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Application of groundwater-mineral equilibrium calculationsto geochemical exploration for sediment-hosted uranium:observations from the Frome Embayment,South Australia

机译:地下水-矿物质平衡计算在沉积物铀矿化探中的应用:南澳大利亚弗罗姆河谷的观测

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This paper considers the interpretation of uranium (U) ore–mineral equilibrium calculations in groundwater to help understand ore genesis and assist exploration. Groundwater samples collected on two recent field sampling trips in the Frome Embayment region of South Australia have been analysed for major and selected trace elements. These data together with previous published data have been used to construct geochemical models of the equilibrium state of the groundwaters. Species’ activities and mineral saturation states have been estimated. Calculated species’ activities are generally in the range reported in the previous modelling by Giblin involving groundwaters from similar local sources. Our models indicate that amorphous UO2, rather than the ore minerals coffinite and uraninite, is the solidU mineral phase that is the likely control on groundwater U concentration. The UO2(am) saturation index did not show a systematic variation with ore grade or proximity to mineralization. Its use for exploration at smaller scales, where the groundwater composition is similar between sample sites and U minerals are present at various concentrations, is doubtful. Inherent limitations on the information provided by mineral saturation indices restrict their exploration application,particularly in high salinity palaeochannel groundwater environments, such as those common in Australia.
机译:本文考虑了铀(U)矿石-矿物 在地下水中的平衡计算的解释,以帮助理解矿石 的成因并协助勘探。分析了最近在南澳大利亚州弗罗姆恩堡地区 的两次实地采样旅行中采集的地下水样品的主要和选定的 痕量元素。这些数据与以前发表的 数据一起用于构建地下水平衡状态的地球化学模型。已经估计了物种的活动和矿物 的饱和状态。计算物种的 活度通常在Giblin先前的 模型中报告的范围内,该范围涉及来自相似的本地 来源的地下水。我们的模型表明,无定形的UO 2 ,而不是 矿石矿物的定性和尿素矿,是固体U矿物 相,可能是对地下水的控制铀浓度。 UO 2 (am)饱和度指数没有显示出随矿石品位或接近矿化的系统性变化。它在较小规模的勘探中的使用 ,其中样品位置之间的地下水组成相似,并且各种浓度的U矿物存在, 值得怀疑。矿物饱和度指数提供的 信息固有的局限性限制了其勘探应用,特别是在高盐度古河道地下水环境中的 ,例如在澳大利亚常见的

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