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2021, 40(4) 807-815 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Discussion on genesis of Delite fluorite deposit in eastern Kunlun, Qinghai Province:evidence from fluidinclusions and stable isotopes |
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WANGHuanxin1,SUNFengyue1,ZHANGTao2,YANJiaming1,LIUChengxian1 |
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1CollegeofEarthSciences,JilinUniversity,Changchun130061,China;
2QingdaoGeologicalEngineeringSurveyInstitute,Qingdao266100,Shandong,China |
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Abstract:
DelitefluoritedepositislocatedintheKunnancompositecollagebeltineasternKunlunorogenic belt.Thegeologicalcharacteristicsofthedeposit,fluidinclusions,HOandSstableisotopesstudieshavebeen carriedouttodiscussthesource,propertiesandphysicochemicalconditionsoforeformingmaterialsandfluids,and toexplorethegenesisofthedeposit.TheresultsshowthattheorebodymainlyoccursinDevonianmonzoniticgranitesandiscontrolledbyNWW andNW faults.Themineralizationisdividedintotwostages,quartzsulfidestage andquartzfluoritestage.Thetemperatureoffluidinclusionsinthemetallogenicstageismeasured.Andtheoreformingfluidhasthecharacteristicsoflowtemperature(107~180℃),lowsalinity(w (NaCleqv) =018% ~907%)andmediumdensity((0930~0991)g/cm3 ),belongingtohydrothermalsolutionofNaClH2Osystem.ThroughtheanalysisofNaClH2OsystemTWρphasediagram,themetallogenicpressureis1~5barand theminimummetallogenicdepthis10~50m.Sisotopeshowsthatcrustderivedcomponentsmayhavebeenadded duringtheemplacementofmantlederivedmagma.HOisotoperesultshowsthattheoreformingfluidismainlyatmosphericprecipitationwithasmallamountofmagmaticfluids.Inconclusion,Delitefluoritedepositisanepithermalveintypedeposit,andthedecreaseoforeformingfluidtemperatureandpressureisthemainmechanismoffluoriteprecipitation. |
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Keywords:
Delitefluoritedeposit
causediscussion
fluidinclusions
stableisotope
easternKunlun
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