Limestone water mixing process and hydrogen and oxygen stable isotope fractionation response under mining action.

Autor: Huang P; School of Resources and Environment Engineering, Henan Polytechnic University, 454000 Jiaozuo, China. Electronic address: hph2001@hpu.edu.cn., Cui M; School of Resources and Environment Engineering, Henan Polytechnic University, 454000 Jiaozuo, China. Electronic address: mkk@home.hpu.edu.cn., Chai S; School of Resources and Environment Engineering, Henan Polytechnic University, 454000 Jiaozuo, China. Electronic address: swchai2000@163.com., Li Y; School of Resources and Environment Engineering, Henan Polytechnic University, 454000 Jiaozuo, China. Electronic address: 1923302910@qq.com., Zhang Y; School of Resources and Environment Engineering, Henan Polytechnic University, 454000 Jiaozuo, China. Electronic address: zynhpu2017@163.com., Yu Z; School of Resources and Environment Engineering, Henan Polytechnic University, 454000 Jiaozuo, China. Electronic address: 784478581@qq.com., Peng W; School of Resources and Environment Engineering, Henan Polytechnic University, 454000 Jiaozuo, China. Electronic address: p2350108361@163.com.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2024 Aug 15; Vol. 255, pp. 119208. Date of Electronic Publication: 2024 May 21.
DOI: 10.1016/j.envres.2024.119208
Abstrakt: North China type coalfield are gradually mining deep, and the mixing of groundwater is intensified. Hydrogen and oxygen isotopes are important elements for tracing groundwater movement. The fractionation response mechanism under mining conditions is not clear. In this paper, combined with numerical simulation, MixSIAR isotope mixing model and other methods, according to the δD, δ 18 O and hydrochemical information of various water bodies, the impact of coal mining on hydrogen and oxygen isotope fractionation is analyzed from multiple perspectives. The results show that summer soil water is the main source of recharge for limestone water, accounting for 30.7%-41.5%, and the Zhan River is the main source of recharge for limestone water. Before groundwater recharge, evaporation leads to the increase of δ 18 O in surface water by 0.31‰-5.58‰, water loss by 1.81%-28.00%, the increase of δ 18 O in soil water by 0.47‰-6.33‰, and water loss by 2.74%-35.80%. Compared with the coal mining layer, the degree of hydrogen and oxygen isotope drift and water-rock interaction in the coal mine stopping layer are significantly improved. The results of numerical simulation show that the pumping activity reduces the 18 O concentration in the mining layer. The ion ratio is used as a new variable to eliminate the influence of water-rock interaction when calculating the mixing ratio. The results show that the limestone water is in a state of receiving external recharge, and mixing effect increases the δ 18 O in limestone water by 0.86‰ on average, and the δD increases by 0.72‰ on average. The research results explain the controlled process of hydrogen and oxygen isotope fractionation under mining conditions, which is of great significance to coal mine safety production.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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