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首页> 外文期刊>Geochemistry: Exploration, Environment, Analysis >Rare earth element geochemistry of groundwater in the Palouse Basin, northern Idaho-eastern Washington
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Rare earth element geochemistry of groundwater in the Palouse Basin, northern Idaho-eastern Washington

机译：爱达荷州北部-华盛顿东部帕卢斯盆地地下水中的稀土元素地球化学

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摘要

Concentrations of rare earth elements (REE) were determined in groundwaters from the Palouse Basin, located in northern Idaho and eastern Washington. Samples were taken from wells and springs tapping waters in four different rock units: loess, Wanapum Basalt, Grande Ronde Basalt, and Moscow Mountain Granite. In general, unfiltered aliquots of the waters had higher concentrations of REE than those filtered through a 0.45 µm filter, sometimes by several orders of magnitude, indicating the presence of REE as suspended particles or large colloids. Overall REE concentrations in the waters decrease, and the unfiltered and filtered aliquots become more similar in concentration, with increasing depth within the stratigraphic section (i.e. loess " BORDER="0"> Wanapum " BORDER="0"> Grande Ronde). There are some distinctions in NASC (North American Shale Composite)-normalized REE patterns among the four groups of waters, but there is considerable variation among the waters within each group. When normalized to their host rocks, most filtered and many unfiltered aliquots of groundwaters from all four units show depletion of the LREE relative to the HREE. The results are consistent with a model in which meteoric water enters the basalt aquifers via the loess, picking up a heavy particulate and some dissolved REE load, followed by infiltration downward through the units. While moving downwards, the waters are subjected to natural filtration processes in which the particulate REE are largely removed.
机译：测定了位于爱达荷州北部和华盛顿东部帕卢斯盆地地下水中的稀土元素（REE）浓度。样品取自 井和泉水，水来自四个不同的岩石单元：黄土， Wanapum玄武岩，Grande Ronde玄武岩和Moscow Mountain Granite。 通常，未经过滤的水等分试样的REE浓度高于通过0.45 µm过滤器过滤的等分试样，有时 几个数量级，表明存在REE 为悬浮颗粒或大胶体。水中的总REE浓度 降低，且未过滤和过滤的等分试样 的浓度变得更相似，随着地层剖面内深度 的增加（即黄土“ BORDER =” 0“> Wanapum” BORDER =“ 0”> Grande Ronde）。四类水 之间在NASC（北美 页岩复合材料）归一化REE模式上有一些区别，但水 之间有相当大的差异。 sup>在每个组中。当归一化为它们的宿主岩石时，来自所有 四个单元的大多数经过sup> 过滤的地下水和许多未过滤的等分试样显示出LREE相对于HREE的消耗。结果与模型一致，在模型中，流水 通过黄土进入玄武岩含水层，吸收了沉重的 颗粒和一些溶解的REE负荷，然后渗透 向下穿过单位。在向下移动时，水 经历自然过滤过程，其中大量去除了 REE颗粒。

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