维西—乔后断裂温泉水文地球化学特征分析

doi:10.12196/j.issn.1000-3274.2025.02.005

Abstract

Abstract: In this paper, 26 hot springs near the Weixi-Qiaohou fault are sampled and analysed to obtain the hydrochemical components of hot springs, such as temperature, ionic component and SiO₂ content, and adopts the silicon-enthalpy model to estimate the hot spring’s geothermal reservoir temperature and circulation depth, on this basis, the relationship between the hydrothermal activity characteristics of hot springs near the fault and the seismic activity was investigated. The results show that the hydrochemical type of the hot springs near the Weixi-Qiaohou fault is mainly of Na-HCO₃ type, which is distributed along the fault from north to south, with local differences, and the Na-SO₄ and Ca-SO₄ types are mainly found in the Lanping area at the northern end of the fault, and Na-SO₄·HCO₃, Ca-SO₄·HCO₃, and Na-Cl types are found in the west of the fault, changes in the chemical composition of hot springs are affected by differences in geothermal reservoir temperature, circulation depth and lithology. The intersecting areas of the Honghe fault and the Eryuan-Heqing fault on the east side of the fault, and the area of Madeng north of Qiaohou in the middle part of the fault are the two geothermal high-value areas, which presents the characteristics of low value at both ends and high value in the middle, geothermal heat sources may be linked to deep crustal rheological materials. The four M≥5.0 earthquakes all occurred in the transition stage of the high value of geothermal field across the fault to the low value of the western side of the fault, and have some correspondence with geothermal spatial distribution.

Key words: Weixi-Qiaohou fault, Hot spring, Geothermal reservoir temperature, Earthquakes, Geothermal anomaly

CLC Number:

P315.7

LI Jian, LI Qing, SHAO Wei-ye, YOU Can, WANG Zhi-hao. Hydrogeochemical Characterisation of Hot Springs of the Weixi-Qiaohou Fault[J]. EARTHQUAKE, 2025, 45(2): 67-84.

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Hydrogeochemical Characterisation of Hot Springs of the Weixi-Qiaohou Fault

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