地球学报2026，Vol.47Issue(1)：49-64,16.DOI:10.3975/cagsb.2025.091321
江西新泉—温汤断裂东段中低温地热流体水化学特征及成因机制
Hydrochemical Characteristics and Genetic Mechanisms of Mid-low Temperature Geothermal Fluids in the Eastern Segment of the Xinquan-Wentang Fault Zone,Jiangxi Province
摘要
Abstract
The eastern segment of the Xinquan-Wentang Fault Zone in Jiangxi Province hosts abundant mid-low temperature geothermal resources.However,research on the genetic mechanism of its geothermal fluids remains relatively scarce,which hinders the scientific development of hydrothermal resources in this area.This study focuses on the geothermal fluids in the eastern part of the Xinquan-Wentang Fault Zone.By integrating hydrogeochemical methods and multi-isotope(H-O-Sr-C)tracing techniques,we identify the hydrochemical circulation and evolutionary processes of the geothermal water and elucidate the genetic mechanism of the geothermal resources.The results show that the geothermal water in the study area exhibits a temperature range of 23.1-40.5℃,weak alkalinity(pH:8.20-8.94),and low total dissolved solids(TDS:135.0-225.2 mg/L),with a HCO3-Na hydrochemical type.Molar ratios of major solutes,Sr isotopic compositions,and hydrogeochemical modeling demonstrated that silicate mineral dissolution dominated the hydrochemical evolution,followed by cation exchange.Hydrogen-oxygen isotopic signatures and radiocarbon(14C)dating revealed that the geothermal waters in the region originated from paleo-atmospheric precipitation at approximately 4 kaBP,with the recharge areas being located in the Wugong Mountain area southwest of the study region(at elevation of 719-1 104 m).Integrated multicomponent solute geothermometry revealed reservoir temperatures of 74.2-115.5℃and circulation depths of 1 660.0-2 881.9 m,with a mixing ratio of shallow cold water ranging from 71.1%to 76.2%.The genetic mechanism of geothermal water involved atmospheric precipitation infiltrating downward through granite-weathering fractures into deep reservoirs,where it was heated by crustal thermal sources.Subsequently,driven by buoyancy forces resulting from density variations,the heated fluid ascended rapidly along the major fault zones and discharges into the valley,due to topographic incision,forming the present hydrothermal geothermal resources in the region.These findings not only clarify the migration and enrichment mechanisms of geothermal fluids in fault-controlled geothermal systems but also provide critical theoretical support for regional geothermal exploration and sustainable utilization.关键词
地热能/水化学特征/同位素特征/水-岩相互作用/成因机制/新泉—温汤断裂Key words
geothermal energy/hydrochemical characteristics/isotope characteristics/water-rock interaction/genetic mechanism/Xinquan-Wentang fault分类
天文与地球科学引用本文复制引用
王路瑶,刘凯,万力,张垚垚,张寿川,贾伍慧,岳鑫蕊,卜高杨..江西新泉—温汤断裂东段中低温地热流体水化学特征及成因机制[J].地球学报,2026,47(1):49-64,16.基金项目
本文由中国地质科学院基本科研业务费专项(编号:JKYZD202401)、地球深部探测与矿产资源勘查国家科技重大专项(编号:2024ZD1004103)、中国地质调査局地质调查项目(编号:DD20221677-2)和中国地质科学院基本科研业务费专项(编号:JKY202406 （编号:JKYZD202401）
JKYQN202307)联合资助. This study was supported by Central Pub-lic-interest Scientific Institution Basal Research Fund(No.JKYZD202401),Deep Earth Probe and Mineral Resources Exploration-National Science and Tech-nology Major Project(No.2024ZD1004103),China Geological Survey(No.DD20221677-2),and the Basal Research Fund of the Chinese Academy of Geological Sciences(Nos.JKYZD202401,JKY202406,and JKYQN202307). （No.JKYZD202401）
