Assessing the hydrothermal influence on natural waters in the Kirishima Volcanic Complex: Insights from rivers, springs and groundwater with varying residence time

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2025-03-15 DOI:10.1016/j.chemgeo.2025.122716

Gibran Romero-Mujalli , Jens Hartmann , Takahiro Hosono , Kiyoshi Ide , Thorben Amann , Pascale Louvat

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引用次数: 0

Abstract

Rivers and groundwaters that drain active volcanic areas are characterized by relatively high nutrient concentrations and dissolved loads. The high dissolved load generally results from the fluid–rock interactions with high temperature fluids containing voclanic gases. In this study, the chemistry of spring and river waters from the Kirishima volcanic region (Kyushu, Japan) is analysed to determine the hydrothermal influence and how their chemical composition varies with respect to the groundwater transit time (residence time). The hydrothermal component is distinguished by combining spring water residence times with stable isotopic composition of

δ^{13} C_{D I C}

δ^{34} S_{s u l p h a t e}

δ^{18} O_{s u l p h a t e}

δ^{18} O_{w a t e r}

δ^{2} H_{w a t e r}

and the selenium to sulphate molar ratio. We found that the DIC and SO₄^2- in the waters draining the Kirishima volcanic complex arose for more than 50 % from volcanic CO₂ and SO₂. Consistently, the groundwaters flowing through longer and deeper flow paths accumulate more volcanic CO_2(g) and SO_2(g). The results from this study highlight the relevance of regional studies of active volcanic settings in understanding the chemical evolution of groundwaters and its implication for the carbon and sulphur budgets in a volcanic edifice.

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.