Hydrogeochemistry of trace elements in geothermal waters from the Rehai geothermal system in Yunnan of China, a magma-indirectly related geothermal system

IF 3.5 2区工程技术 Q3 ENERGY & FUELS Geothermics Pub Date : 2024-08-20 DOI:10.1016/j.geothermics.2024.103134

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Abstract

The researches on the hydrogeochemistry of geothermal waters from magma-indirectly related geothermal systems in Yunnan-Tibet geothermal belt (YTGB) mainly focus on major ions and stable isotopes, but the studies of trace elements are limited and the hydrogeochemistry of trace elements is not yet clear, and whether trace elements can be used to reveal the origin of geothermal water still needs to be studied. Therefore, in this article, trace elements (Li, Cs, Rb, Sb, W, V, Cr, Ba, Sr and Mo) in the geothermal waters in the Rehai geothermal system in Yunnan in China, one of the few geothermal systems with acidic geothermal water, are selected to study the source, evolution and enrichment of trace elements combined with the major ions and δ²H and δ¹⁸O isotopes. The results show that the geothermal waters are divided into four clusters and the trace elements are divided into three groups. Group 1 (Li, Cs, Rb, W, V, Sb and Cr) are of magmatic fluid origin and can be used to indicate whether a geothermal system has a magma heat source. Group 2 (Sr and Mo) mainly originate from the incongruent leaching of host rocks and Group 3 (Ba) mainly originates from the mixing with shallow groundwater and the incongruent leaching of host rocks. The hydrogeochemical processes controlling the concentrations of trace elements of each group are discussed, and on this basis, the origin, evolution and enrichment of the trace elements of each cluster are determined. Li, Cs, Rb, Sb, W, V and Cr have the potential the potential to indicate the heat source properties of hydrothermal geothermal systems, but Ba, Sr and Mo do not. Finally, the origin, and evolution model of these trace elements in the RH geothermal waters are established. The research is helpful in understanding the migration and transformation of mass in deep circulation of geothermal water, the characteristics of magmatic water, hydrothermal mineralization, and the comprehensive utilization and development of geothermal resources in similar regions.

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中国云南热海地热系统（岩浆直接相关地热系统）地热水体中微量元素的水地球化学研究

滇藏地热带（YTGB）岩浆直接相关地热系统地热水的水地球化学研究主要集中在主要离子和稳定同位素方面，对微量元素的研究较少，微量元素的水地球化学尚不明确，能否利用微量元素揭示地热水的成因仍有待研究。因此，本文选取中国云南热海地热系统（为数不多的酸性地热系统之一）地热水中的微量元素（Li、Cs、Rb、Sb、W、V、Cr、Ba、Sr和Mo），结合主要离子和δ2H、δ18O同位素，对微量元素的来源、演化和富集进行了研究。结果表明，地热水分为四组，微量元素分为三组。第 1 组（Li、Cs、Rb、W、V、Sb 和 Cr）来源于岩浆流体，可用于指示地热系统是否有岩浆热源。第 2 组（锶和钼）主要来源于寄主岩的不相容浸出，第 3 组（钡）主要来源于与浅层地下水的混合和寄主岩的不相容浸出。讨论了控制各组微量元素浓度的水文地球化学过程，并在此基础上确定了各组微量元素的来源、演变和富集。Li、Cs、Rb、Sb、W、V 和 Cr 具有显示热液地热系统热源特性的潜力，而 Ba、Sr 和 Mo 则没有。最后，建立了这些微量元素在 RH 地热水体中的起源和演化模型。该研究有助于了解地热水深层循环中质量的迁移和转化、岩浆水的特征、热液成矿以及类似地区地热资源的综合利用和开发。

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来源期刊

Geothermics 工程技术-地球科学综合

CiteScore

7.70

自引率

15.40%

发文量

237

审稿时长

4.5 months

期刊介绍： Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.