岩矿测试2026，Vol.45Issue(3)：570-581,12.DOI:10.15898/j.ykcs.202506240183
基于氦同位素研究赣西温汤断裂带地热流体热源特征
Heat Source Characteristics of Geothermal Fluids in the Wentang Fault Zone,Western Jiangxi,Based on Helium Isotopes
摘要
Abstract
As a critical tracer for deep fluid activities,gas isotopes are of significant scientific importance for elucidating the formation mechanism of fault-controlled geothermal resources.The genesis of geothermal resources in the Wentang fault zone is jointly governed by fault structures and heat sources;however,the underlying heat source mechanism remains to be further investigated.In this work,six geothermal fluid samples were collected from the Wentang fault zone,followed by systematic analysis of the gas composition and helium(He)isotope signatures of dissolved gases in geothermal water.Integrating the He isotopic characteristics with terrestrial heat flow estimation,the heat source contribution and thermal structure characteristics of the fault-controlled geothermal system were revealed.(1)Dissolved gases in geothermal water are dominated by N2 and O2,with concentrations ranging from 88.43%to 96.46%and 1.23%to 9.19%,respectively;the 3He/4He ratio varies between 0.08Ra and 0.82Ra,indicating that helium is primarily derived from the mixture of crustal radioactive decay and atmospheric input,with negligible mantle-derived contribution.(2)Terrestrial heat flow values estimated from the corrected He isotope ratios range from 34.47 to 62.00 mW/m2,with an average of 47.53 mW/m2,exhibiting a"hot crust-cold mantle"lithospheric thermal structure.(3)A significant negative correlation exists between the cold water mixing ratio and heat flow values(R2=0.84),suggesting that the dilution effect of shallow cold water notably impacts the accuracy of terrestrial heat flow estimation.By integrating the isotopic characteristics of dissolved gases in geothermal water,the heat source of geothermal resources in the Wentang fault zone is confirmed as being predominantly crust-derived,providing an isotopic geochemical basis for geothermal exploration and geothermal reservoir assessment in the study area.The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202506240183.关键词
氦同位素/大地热流/气体组分/热源机制/地壳来源/电感耦合等离子体质谱法/稀有气体同位素比值质谱法Key words
helium isotopes/terrestrial heat flow/gas components/heat source mechanism/crustal origin/inductively coupled plasma-mass spectrometry/noble gas isotope ratio mass spectrometry分类
天文与地球科学引用本文复制引用
张鑫馨,刘凯,贾伍慧,张垚垚,张寿川,王路瑶..基于氦同位素研究赣西温汤断裂带地热流体热源特征[J].岩矿测试,2026,45(3):570-581,12.基金项目
地球深部探测与矿产资源勘查国家科技重大专项(2024ZD1004103) （2024ZD1004103）
中国地质科学院基本科研业务费项目(JKYZD202401) （JKYZD202401）
