Isotopic identification of groundwater circulation and mixing in the Legnica-Głogów Copper District mines

IF 3.1 3区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Applied Geochemistry Pub Date : 2023-10-16 DOI:10.1016/j.apgeochem.2023.105804

Robert Duda , Marek Duliński , Waldemar Pawlik , Michał Sidełko

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Abstract

Identification of the conditions of circulation, mixing, origin and age of groundwater in the area of underground mining plants is necessary for the correct design of drainage systems, directions of mining exploitation and intensity of mining works. For this purpose, isotopic studies were carried out in the mines of the Legnica-Głogów Copper District (LGCD) in Poland, characterized by complex hydrogeological conditions. The observed values of δ²H, δ¹⁸O and concentrations of tritium, as well as chlorides, sulfates and main cations in 29 water samples taken from different lithostratigraphic levels (and a few historical results) were used to explain the spatial variability of the origin of groundwater flowing into the mines. A model of groundwater mixing in the mining area of the LGCD was developed. The results of the research indicate that, depending on the region, the LGCD mines contain Holocene and/or interglacial waters, pre-Quaternary waters as well as older waters, recharged in period of very warm climate - flowing into the mining workings from deeper geological strata. Isotopic studies together with the chloride content measurements confirmed the correctness of the conceptual model of groundwater circulation within the mines. Their results will be useful in further elaboration of the strategy related to dewatering and designing further mining activities.

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Legnica-Głogów铜矿区地下水循环混合同位素识别

为了正确设计排水系统、采矿方向和采矿工程强度，有必要确定地下采矿厂区域内地下水的循环、混合、来源和年龄。为此，对波兰Legnica-Głogów铜矿区（LGCD）的矿山进行了同位素研究，这些矿山具有复杂的水文地质条件。利用从不同岩石地层水平采集的29个水样中的δ2H、δ18O和氚浓度以及氯化物、硫酸盐和主要阳离子的观测值（以及一些历史结果）来解释流入矿山的地下水来源的空间变异性。建立了LGCD矿区地下水混合模型。研究结果表明，根据地区的不同，LGCD矿山包含全新世和/或间冰川水、前第四纪水以及较老的水，这些水在非常温暖的气候时期补给，从更深的地质层流入采矿工作区。同位素研究和氯化物含量测量证实了矿井内地下水循环概念模型的正确性。他们的研究结果将有助于进一步制定与脱水和设计进一步采矿活动有关的战略。

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来源期刊

Applied Geochemistry 地学-地球化学与地球物理

CiteScore

6.10

自引率

8.80%

发文量

272

审稿时长

65 days

期刊介绍： Applied Geochemistry is an international journal devoted to publication of original research papers, rapid research communications and selected review papers in geochemistry and urban geochemistry which have some practical application to an aspect of human endeavour, such as the preservation of the environment, health, waste disposal and the search for resources. Papers on applications of inorganic, organic and isotope geochemistry and geochemical processes are therefore welcome provided they meet the main criterion. Spatial and temporal monitoring case studies are only of interest to our international readership if they present new ideas of broad application. Topics covered include: (1) Environmental geochemistry (including natural and anthropogenic aspects, and protection and remediation strategies); (2) Hydrogeochemistry (surface and groundwater); (3) Medical (urban) geochemistry; (4) The search for energy resources (in particular unconventional oil and gas or emerging metal resources); (5) Energy exploitation (in particular geothermal energy and CCS); (6) Upgrading of energy and mineral resources where there is a direct geochemical application; and (7) Waste disposal, including nuclear waste disposal.