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1、中國(guó)典型高溫?zé)崽餆崴逆J同位素研究1000.0569/2003/019(03)-0569-76ActaPetrologicaSinica巖石中國(guó)典型高溫?zé)崽餆崴逆J同位素研究趙平多吉謝鄂軍金建ZHAOPing,DORJi,XIEEJunandJINJian1.中國(guó)科學(xué)院地質(zhì)與地球物理研究所,北京1000292.西藏地?zé)岬刭|(zhì)大隊(duì),拉薩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