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1、中国典型高温热田热水的锶同位素研究1000.0569/2003/019(03)-0569-76ActaPetrologicaSinica岩石中国典型高温热田热水的锶同位素研究赵平多吉谢鄂军金建ZHAOPing,DORJi,XIEEJunandJINJian1.中国科学院地质与地球物理研究所,北京1000292.西藏地热地质大队,拉萨8500001.InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing100029,China2.GeothermalGeologyTeamofTibet,Lhttstl850000,Ch
2、ina2003-05-08收稿.2003-05—27改回.ZhaoP.DotJ.XieEJandJillJ.2003.Strontiumisotopedataforthermalwatersinselectedhigh-temperaturegeothermalfields,China.ActaPeWo~gicaSinica.19(3):569—576AbstractMostofgeothermalwatersaremeteoricoriginintheYunnan-TibetGeothermalBelt.Pulledbygravity,meteoricwatersmovedownalon
3、gfracturezone.increasetemperaturebyabsorbingheatfromwallrockanddissolvestrontiumcomponentfromrock—formingminerals.Therefore.itisfeasiblethattheSr/srvaluesofthermalwaterscanpreserveevidenceoffluidresidencewherewater—rockinteractionoccul~intensively.Studiesonthe87Sr/86Srvaluesofthermalwatersandwallr
4、ockcanexplaintherelationshipbetweenshallowanddeepthermalwatersandidentifywhethersomereservoirsarehydraulicallyconnectedintheregion.ValuesforSr/Sringranitesaredifferentfromtheno~hernpartoftheYan【gbajaingeothermalfield,Tibet.However,theshallowanddeepthe13111alwatersarestableandquitesimilarin.Sr/86Sr
5、.varyingfrom0.7122to0.7126.Thethermalwatersareslightlyhigherthancoldgroundwaterin盯Sr/86Sr,accordanttoPlioceneepochgraniteanddifferentfromMioceneepochgraniticmyloniteins7Sr/86Sr.ItimpliesthethermalwatersaremainlyassemblageandstorageinPlioceneepochgranite.WhentheshallowthermalwaterflowsfromNWtoSE,CO
6、2-richsteamescapingresultsincarbonatetobecomeover—saturation,suchasCaCO3,MgCO3andSrCO.,I1lecarbonateprecipitationwiUbethemainprocessotherthanwallrockdissolution.QuaternaryalluviumdoesnotapparentlyaffecttheinitialSr/Srvalueofthel3malwatersintheshallowreservoir.,I1leRehaigeothermalfieldofTengchongCo
7、untyinYunnanProvinceisauniquehigh—temperaturegeothermalsystemrelatedtomantle.derivedmagmachamberinthemainland.Intheeasternpartofthefield.thermalwatersareofhighSiO,concentration,lowNa,,KratioandSr/srvaluesintheran
