富钨浅层地下水的赋存与下伏热液活动和深层地热流体中硫钨酸盐的形成有关

IF 3.6 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Qinghai Guo, Junbiao Qian, Hao Luo, Li Luo
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引用次数: 0

摘要

近年来,自然水体系统中的钨(W)地球化学研究引起了人们极大的科学兴趣。虽然非矿化浅层地下水通常表现为低W浓度,但在中国天阳盆地非矿化浅层地下水中W水平升高(超过500 μg/L)和下降(<1 μg/L)的共存为研究自然富集W的新机制提供了一个令人信服的案例。高W浅层地下水(包括热地下水和非热地下水)在深钻孔上方空间上聚集,发现太古宙地热流体具有异常的W浓度(高达614.1 μg/L)。水文地球化学分析表明,这些高w第四纪地下水(也富含Cl, Si, B, F, Li, Rb和Cs),与我们的预测一致,起源于太古宙地热流体,经过绝热冷却,传导热损失,与浅层渗透的大气水混合或混合过程。太古宙地热流体中W的富集主要源于两种协同机制:(1)富W太古宙储层岩石的广泛浸出;(2)硫化物驱动的水态钨酸盐转化为硫代钨酸盐,这规避了普通含W矿物(如黑钨矿)的溶解度限制。具体来说,硫化物地热流体中硫钨酸盐的形成抑制了W在矿物相中的封存,维持了异常高的溶解W浓度。该研究为深层地热流体中硫钨酸盐的形成与浅层地下水中W的富集提供了明确的证据,促进了我们对地热和非热含水层界面W地球化学的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Occurrence of tungsten-rich shallow groundwaters linked to underlying hydrothermal activities and thiotungstates formation in deep geothermal fluids
Tungsten (W) geochemistry in natural aquatic systems has garnered significant scientific interest in recent years. While non-mineralized shallow groundwaters typically exhibit low W concentrations, the coexistence of both elevated (over 500 μg/L) and depleted (<1 μg/L) W levels in shallow groundwaters within the non-mining Tianyang basin (China) presents a compelling case for investigating novel mechanisms of natural W enrichment. High-W shallow groundwaters—both thermal and nonthermal—are spatially clustered above deep boreholes-discovered Archaean geothermal fluids with exceptional W concentrations (up to 614.1 μg/L). Hydrogeochemical analyses reveal that these high-W Quaternary groundwaters (also enriched in Cl, Si, B, F, Li, Rb, and Cs), ‌in line with our predictions, originate from Archaean geothermal fluids through processes including adiabatic cooling, conductive heat loss, mixing with infiltrating meteoric waters at shallow depths, or hybrid ones. The W enrichment in Archaean geothermal fluids arises primarily from two synergistic mechanisms: (1) extensive leaching of W-rich Archaean reservoir rocks, and (2) sulfide-driven conversion of aqueous tungstate to thiotungstates, which circumvents solubility limitations imposed by common W-bearing minerals (e.g., wolframite). Specifically, thiotungstates formation in sulfidic geothermal fluids inhibits W sequestration into mineral phases, sustaining anomalously high dissolved W concentrations. This study provides the definitive evidence linking thiotungstate speciation in deep geothermal fluids to W enrichment in shallow groundwaters, advancing our understanding of W geochemistry in interfaces between geothermal and non-thermal aquifers.
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来源期刊
Chemical Geology
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.
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