The difference in hydrochemical characteristics of geothermal water between the eastern and western parts of the Wugongshan area and its genetic mechanism

IF 3.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Wuhui Jia , Kai Liu , Jinkai Yan , Yaoyao Zhang , Jue Tong , Kun Yu , Shouchuan Zhang , Luyao Wang , Chenghua Yu
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Abstract

The hydrogeochemical signature of the discharged water can reveal significant information on the circulation and evolution of geothermal water, which can further guide the exploration and utilization of geothermal water resources. In this study, the source of major ions, reservoir temperature, and cycle time of geothermal fluids were clarified by the Ion relationship analysis, integrated multicomponent solute geothermometry method, and 14C isotope analysis, respectively, in the Wugongshan area of South China. Results show that the eastern and western parts of the Wugongshan area have distinct types of geothermal fluids, i.e. HCO3-Na and SO4HCO3-Na, respectively. The major source of HCO3 and Na+ is the hydrolysis of silicate minerals, partially accompanied by cation exchange. While gypsum hydrolysis and sulfide oxidation are the primary producers of SO42−. Moreover, higher TDS, PH, and degree of cation exchange of geothermal fluids were found in the western part than that in the eastern part. The reservoir temperatures in the eastern and western portions are comparable (115–150 °C). However, the cycle time of the geothermal fluids in the western part (15,743 years on average) is much greater than in the eastern part (2160 years on average), which is considered to be the main reason for the difference in hydrogeochemical characteristics. This study can provide theoretical support for the rational development and usage of geothermal water resources.

武功山东西部地热水水化学特征的差异及其成因机制
出水的水文地球化学特征可以揭示地热水循环和演化的重要信息,从而进一步指导地热水资源的勘探和利用。本研究通过离子关系分析法、多组分溶质综合地温测量法和 14C 同位素分析法,分别阐明了华南武功山地区地热流体的主要离子来源、储层温度和循环时间。结果表明,武功山地区的东部和西部分别存在不同类型的地热流体,即 HCO3-Na 和 SO4HCO3-Na。HCO3- 和 Na+ 的主要来源是硅酸盐矿物的水解,部分伴有阳离子交换。而石膏水解和硫化物氧化则是 SO42- 的主要来源。此外,西部地热流体的 TDS、PH 值和阳离子交换程度均高于东部。东部和西部的储层温度相当(115-150 °C)。但西部地热流体的循环时间(平均 15743 年)远大于东部(平均 2160 年),这被认为是造成水文地球化学特征差异的主要原因。这项研究可为合理开发和利用地热水资源提供理论支持。
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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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