滇藏地热带保山附近怒江两岸温泉的水地球化学特征

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2024-11-11 DOI:10.1016/j.ejrh.2024.102055

Jingru Ma , Xun Zhou , Yanqiu Wu , Linyang Zhuo , Mengmeng Wang , Yu Liu , Hongfei Xu , Yixuan Wang , Guangbin Tao , Jingwen Cui , Chun Wang , Yanxiang Shi , Tong Zhang , Mengying Chen , Qiqi Liu

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引用次数: 0

摘要

研究区域云南西部保山附近的怒江断裂带。研究重点分析了 15 个温泉水样本的主要水化学元素和稳定同位素，以揭示温泉的水文地质化学演变过程、补给来源、地热条件和构造控制成因。对该地区水文的新认识保山正在经历清洁能源开发浪潮，特别是地热能源。怒江断裂带将腾冲地块与保山地块分隔开来，构成了一个以众多温泉为特征的中低温地热系统。所调查的温泉位于怒江断裂带保山附近。已确定的水化学类型有四种，其中以 HCO3-Ca⋅Mg 型为主。泉水的主要成分来自碳酸盐和硅酸盐矿物的风化或溶解以及反向阳离子交换。稳定同位素表明，这些温泉主要由夏季季风期间的大气降水形成。补给区位于怒江周围的山区，海拔在 1606 至 2504 米之间，气温在 3°C 至 8°C 之间。地热储层的估计温度为 73°C 至 192°C。在上升过程中，冷水的混合比例在 60 % 至 79 % 之间，循环深度在 1928 米至 4221 米之间。Li和Cl之间的正相关性表明，温泉源于受怒江断层控制的同一母体地热流体，或由两个深度相交的次级断层控制。循环深度较浅的温泉主要由 HCO3-Ca⋅Mg 型组成，而循环深度较深的泉水主要由 HCO3-Na 型组成。温泉出水位置与怒江江面的高度差与地热储层温度呈正相关。本文强调了区域断裂带内温泉的水文地球化学特征，对类似构造控制区地热系统的开发和勘探具有重要意义。

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Characterization of hydrogeochemistry of the hot springs on both sides of the Nujiang River near Baoshan in the Yunnan-Tibet Geothermal Belt

Study region

The Nujiang Fault Zone near Baoshan in western Yunnan.

Study focus

Major hydrochemical elements and stable isotopes of 15 hot spring water samples are analyzed to reveal hydrogeochemical evolution processes, recharge sources, geothermal conditions, and structural control genesis of the hot springs.

New hydrological insight for the region

Baoshan is experiencing a wave of clean energy development, specifically geothermal energy. The Nujiang Fault Zone, which separates the Tengchong Block from the Baoshan Block, constitutes a low- to medium-temperature geothermal system characterized by numerous hot springs. The hot springs under investigation are located near Baoshan along the Nujiang Fault. Four hydrochemical types have been identified, with HCO₃-Ca⋅Mg being the predominant type. The primary components of spring waters originate from the weathering or dissolution of carbonate and silicate minerals, as well as the reverse cation exchange. Stable isotopes indicate that these hot springs are predominantly formed by the atmospheric precipitation during the summer monsoon. The recharge areas are located in the mountainous regions around the Nujiang River, at elevations ranging from 1606 to 2504 m and temperatures between 3°C and 8°C. The estimated temperature of the geothermal reservoir ranges from 73°C to 192°C. During the ascent process, the mixing ratio of cold water is between 60 % and 79 %, and the circulation depth ranges from 1928 to 4221 m. The positive correlation between Li and Cl indicates that hot springs originate from the same parent geothermal fluid controlled by the Nujiang Fault or by two secondary faults intersecting at depths. The hot springs with shallower circulation depths are mainly composed of HCO₃-Ca⋅Mg type, while the deeper circulating spring waters consist primarily of HCO₃-Na type. The height difference between the discharge location of the hot springs and the surface of the Nujiang River correlates positively with the geothermal reservoir temperature. This paper emphasizes the hydrogeochemical characterization of hot springs within regional fault zones, which holds significant implications for the development and exploration of geothermal systems in similar structural control areas.

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.