简介：Thisstudyfocusesonthehydrochemicalcharacteristicsof47watersamplescollectedfromthermalandcoldspringsthatemergefromtheHammamRighageothermal?eld,locatedinnorth-centralAlgeria.TheaquiferthatfeedsthesespringsismainlysituatedinthedeeplyfracturedJurassiclimestoneanddolomiteoftheZaccarMount.Measureddischargetemperaturesofthecoldwatersrangefrom16.0to26.5°Candthehotwatersfrom32.1to68.2°C.Allwatersexhibitedanear-neutralpHof6.0–7.6.Thethermalwatershadahightotaldissolvedsolids（TDS）contentofupto2527mg/l,whiletheTDSforcoldwaterswas659.0–852.0mg/l.Chemicalanalysessuggestthattwomaintypesofwaterexist:hotwatersintheup?owareaoftheCa–Na–SO4type（HammamRigha）andcoldwatersintherechargezoneoftheCa–Na–HCO3type（ZaccarMount）.Reservoirtemperatureswereestimatedusingsilicageothermometersand?uid/mineralequilibriaat78,92,and95°CforHR4,HR2,andHR1,respectively.Stableisotopicanalysesoftheδ18OandδDcompositionofthewaterssuggestthatthethermalwatersofHammamRighaareofmeteoricorigin.Weconcludethatmeteoricrechargein?ltratesthroughthefractureddolomiticlimestonesoftheZaccarMountandisconductivelyheatedatadepthof2.1–2.2km.ThehotwaterstheninteractatdepthwithTriassicevaporiteslocatedinthehydrothermalconduit（fault）,givingrisetotheCa–Na–SO4watertype.Astheyascendtothesurface,thethermalwatersmixwithshallowerMg-richgroundwater,resultinginwatersthatplotintheimmaturewater?eldintheNa–K–Mgdiagram.Themixingtrendbetweencoldgroundwatersfromtherechargezonearea（ZaccarMount）andhotwatersintheup?owarea（HammamRigha）isapparentviaachloride-enthalpydiagramthatshowsamixingratioof22.6\R\29.2%.WesummarizetheseresultswithageothermalconceptualmodeloftheHammamRighageothermal?eld.

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