波兰东南部圣十字山脉地下水中稀土元素和钇的特性

IF 3.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Dorota Kaczor-Kurzawa , Irena Wysocka , Monika Chuchro
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引用次数: 0

摘要

在地质对比强烈的地区,含水层内的环境条件可能会突然发生意想不到的局部但重大的空间变化,从而阻碍了对地下水化学的准确评估。最近,稀土元素(REEs)因其对环境变化的独特敏感性而被广泛用于识别水系统中的地球化学过程。本研究结合稀土元素和钇(钇)、水的主要成分、次要成分和痕量成分的化学参数,以及 δ18O-H2O、δ2H-H2O、3H-H2O、δ34S-SO4、δ18O-SO4 等同位素特征,对圣十字山地下水的地球化学过程进行了研究,以便更好地了解圣十字山地下水的地球化学过程。所研究的水是 "年轻的",来自流星,pH 值为酸性至微碱性(4.95-7.75),TDS 值为 38.97-2713.91 毫克/升。它们主要属于 HCO3-Ca-Mg 型,较少属于 HCO3-Ca-SO4-(Mg) 或 SO4-Ca-(Mg) 型。在所研究的水域中,REEs(5.55 至 13,857.35 纳克/升)和 Y(4.43 至 2450.22 纳克/升)的溶解(0.45 微米)浓度是主岩溶解的结果,并且通过岩石和酸性水之间的相互作用,浓度往往会显著增加,最多可达几个数量级。通过对物种的计算发现,溶解在中性和碱性水体中的 REE + Y 主要以碳酸氢盐 (CO3)2- 和碳酸盐 CO3+ 复合物的形式迁移,而在酸性较强的环境中,这些元素最好以游离离子(REE3++Y3+)的形式存在,并且其丰度随着 pH 值的降低而逐渐增加。所研究水域的 EUS(欧洲页岩)归一化 REE 模式显示出两种不同的主要类型:(i) HREE 富集(LREEs<MREEs<HREEs)的向上倾斜型,(ii) MREE 富集(LREEs<MREEs>HREEs)的凸型。第一种模式反映了碱性和含氧水体中的 REE 分馏,导致 LREE 优先吸附在矿物颗粒上,同时 HREE 与碳酸根离子和碳酸氢根离子络合;第二种模式则是主岩在酸性条件下溶解的结果。除了一些来自碳酸盐含水层的水样之外,所研究水体中的 REE 模式大多不同于主岩特有的 REE 模式。在所研究的水域中记录到了 Ce 和 Eu 异常。一些负的 Ce 和正的 Eu 异常是由寄主岩溶解引起的,而其他负的或正的 Ce 异常则分别反映了含氧或更多的还原条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The behavior of the rare earth elements and yttrium in groundwaters of the Holy Cross Mountains, SE Poland

In areas of contrasting geology, local but significant spatial changes in environmental conditions can occur suddenly and unexpectedly within aquifers, hampering accurate assessment of groundwater chemistry. Recently, the rare earth elements (REEs) have become extensively used in identifying geochemical processes in aqueous systems, due to their unique sensitivity to environmental changes. In this study, the REEs and Y (yttrium), combined with the chemical parameters of the main, minor and trace water components, and with the isotopic signatures of δ18O-H2O, δ2H-H2O, 3H-H2O, δ34S-SO4, δ18O-SO4, were investigated in order to gain a better understanding of the geochemistry of the groundwaters in the Holy Cross Mountains, which possesses a diverse hydrogeological system. The waters studied are ‘young’, meteoric-derived, of acidic to slightly alkaline pH (4.95–7.75) and TDS values of 38.97–2713.91 mg/L. They represent predominantly the HCO3-Ca-Mg and less often the HCO3-Ca-SO4-(Mg) or SO4-Ca-(Mg) types. The dissolved (<0.45 μm) concentrations of the REEs (5.55 to 13,857.35 ng/L) and Y (4.43 to 2450.22 ng/L) in the waters studied are the result of host rock dissolution, and tend to increase significantly, by up to several orders of magnitude, via interactions between the rocks and acidic waters. Speciation calculation reveals that dissolved REE + Y in neutral and alkaline waters are transported mainly as bicarbonate (CO3)2 and carbonate CO3+ complexes, while in a more acidic environment these elements occur preferably as free ions (REE3++Y3+), and their abundance gradually increases along with decreasing pH value. The EUS (European Shale) normalized REE patterns of the waters studied show two distinct dominant types: (i) upwards-sloping with HREE-enrichment (LREEs<MREEs<HREEs), (ii) convex with MREE-enrichment (LREEs<MREEs>HREEs). The first pattern type reflects REE fractionation in alkaline and oxygenated waters, leading to preferential LREE adsorption onto mineral particles, accompanied by complexation of HREEs with carbonate and bicarbonate ions, while the second pattern type results from dissolution of the host rocks in more acidic conditions. The REE patterns in the waters studied are mostly different from the REE patterns characteristic of the host rocks, except for some water samples from carbonate aquifers. Ce and Eu anomalies were recorded in the waters studied. Some of the negative Ce and positive Eu anomalies were inherited from host rock dissolution, while other negative or positive Ce anomalies reflect oxygenic or more reducing conditions, respectively.

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来源期刊
Journal of Geochemical Exploration
Journal of Geochemical Exploration 地学-地球化学与地球物理
CiteScore
7.40
自引率
7.70%
发文量
148
审稿时长
8.1 months
期刊介绍: Journal of Geochemical Exploration is mostly dedicated to publication of original studies in exploration and environmental geochemistry and related topics. Contributions considered of prevalent interest for the journal include researches based on the application of innovative methods to: define the genesis and the evolution of mineral deposits including transfer of elements in large-scale mineralized areas. analyze complex systems at the boundaries between bio-geochemistry, metal transport and mineral accumulation. evaluate effects of historical mining activities on the surface environment. trace pollutant sources and define their fate and transport models in the near-surface and surface environments involving solid, fluid and aerial matrices. assess and quantify natural and technogenic radioactivity in the environment. determine geochemical anomalies and set baseline reference values using compositional data analysis, multivariate statistics and geo-spatial analysis. assess the impacts of anthropogenic contamination on ecosystems and human health at local and regional scale to prioritize and classify risks through deterministic and stochastic approaches. Papers dedicated to the presentation of newly developed methods in analytical geochemistry to be applied in the field or in laboratory are also within the topics of interest for the journal.
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