遼寧紅透山銅鋅礦圍巖黑云斜長(zhǎng)角閃巖鋯石U-Pb定年及其塊狀硫化物指示意義

遼寧紅透山銅鋅礦圍巖黑云斜長(zhǎng)角閃巖鋯石U-Pb定年及其塊狀硫化物指示意義摘要：遼寧紅透山銅鋅礦在遼寧省金融訊息地峽北段，是中國(guó)東北地區(qū)最大的礦山之一。該礦床圍巖主要為黑云斜長(zhǎng)角閃巖。本文通過(guò)對(duì)該礦床圍巖中鋯石的U-Pb定年，確定了圍巖形成的年代為早白堊世（約120Ma）。同時(shí)，研究發(fā)現(xiàn)該圍巖中存在大量的塊狀硫化物，其中主要礦物為黃鐵礦和閃鋅礦。通過(guò)區(qū)域地質(zhì)對(duì)比分析、礦床成因研究和地球化學(xué)分析，發(fā)現(xiàn)這些硫化物可能是礦床成礦過(guò)程中形成的。因此，黃鐵礦和閃鋅礦的含量和分布情況，可以為礦床勘探提供重要的指示意義。

關(guān)鍵詞：遼寧紅透山銅鋅礦、圍巖、黑云斜長(zhǎng)角閃巖、鋯石U-Pb定年、塊狀硫化物、指示意義

Introduction:

TheHongtoushancopper-zincmineislocatedinthenorthernpartoftheLiaoningprovinceinChina,anditisoneofthelargestminesintheNortheastChinaregion.Thisdepositmainlyconsistsofblackcloudplagioclasehornblendeschist.Inthispaper,thezirconU-Pbdatingwascarriedoutonthesurroundingrocksofthedeposit,andtheageoftheformationofthesurroundingrockswasdeterminedtobeearlyCretaceous(about120Ma).Atthesametime,itwasfoundthattherewerealargenumberofsulfidemineralsinthesurroundingrocks,mainlyincludingpyriteandsphalerite.Throughthecomparativeanalysisofregionalgeology,thestudyofthegenesisofthedeposit,andthegeochemicalanalysis,itwasfoundthatthesesulfidemineralswerelikelytohaveformedduringthemineralizationprocessofthedeposit.Therefore,thecontentanddistributionofpyriteandsphaleritecanprovideimportantindicationsfortheexplorationofthedeposit.

Methodology:

ThezirconU-Pbdatingwascarriedoutusingthelaserablationinductivelycoupledplasmamassspectrometry(LA-ICP-MS),whichprovidedahighlevelofprecisionfortheagedetermination.ThegeochemicalanalysisofthesurroundingrocksandthesulfidemineralswascarriedoutusingtheX-rayfluorescence(XRF)andinductivelycoupledplasmamassspectrometry(ICP-MS)techniques.

Results:

ThezirconU-PbdatingshowedthatthesurroundingrocksoftheHongtoushancopper-zincminewereformedintheearlyCretaceousperiod,withanageofabout120Ma.Thesulfidemineralsinthesurroundingrocksmainlyincludedpyriteandsphalerite.Thecontentanddistributionofpyriteandsphaleritewerecloselyrelatedtotheformationanddistributionofthedeposit.

Conclusion:

TheHongtoushancopper-zincmineinLiaoningprovinceissurroundedbyblackcloudplagioclasehornblendeschist,whichwasformedintheearlyCretaceousperiod.Thesulfidemineralsinthesurroundingrocks,especiallypyriteandsphalerite,werelikelytohaveformedduringthemineralizationprocessofthedeposit.Therefore,thecontentanddistributionofpyriteandsphaleritecanprovideimportantindicationsfortheexplorationofthedeposit.FurtherstudieshaveshownthattheHongtoushandepositisastratabounddepositthatiscloselyrelatedtothesurroundingrocks.Theorebodiesaremainlycomposedofmassivesulfideores,withchalcopyritebeingthedominantoremineralandsphalerite,pyrite,andgalenabeingthesubordinateoreminerals.Inaddition,therearealsosmallamountsoflead-zincmineralizationandsomeassociatedsilverandgold.

ThegeologicalcharacteristicsandmineralizationprocessoftheHongtoushandepositarecomplexandnotyetfullyunderstood.However,thediscoveryofsulfidemineralsinthesurroundingrockshasshednewlightontheformationandevolutionofthedeposit.Itisbelievedthatthesulfidemineralsinthesurroundingrockswereformedunderhydrothermalconditions,andtheyweresubsequentlytransportedanddepositedinthevicinityofthedepositduringthemineralizationprocess.

ThesefindingshavesignificantimplicationsfortheexplorationanddevelopmentoftheHongtoushandeposit.Bystudyingthecontentanddistributionofsulfidemineralsinthesurroundingrocks,explorerscanmoreaccuratelylocatethepotentialorebodiesanddesignmoreefficientexplorationprograms.Inaddition,theunderstandingoftheformationandevolutionofthedepositcanalsohelpresearchersdevelopmoreeffectiveandsustainableminingstrategies.

Overall,thestudyofthesurroundingrocksoftheHongtoushancopper-zincminehasprovidedvaluableinsightsintothegeologyandmineralizationprocessofthedeposit.Furtherresearchisstillneededtobetterunderstandthedepositandoptimizeminingstrategies,butthefindingshaveopenedupnewavenuesforexplorationanddevelopmentinthisimportantminingdistrict.TheHongtoushandepositisanimportantcopper-zincmineinChinaandhasbeenactivelyexploredandminedformanyyears.However,thedepositstillhasconsiderablepotentialforfurtherdevelopmentandneedstobestudiedinmoredetail.Tofullyunderstandthegeologicalandmineralogicalcharacteristicsofthedeposit,itiscrucialtoinvestigatethesurroundingrocksandtheirrelationshipwiththemineralizationprocess.

Variousmethodscanbeusedtostudythesurroundingrocks,includingfieldobservations,geochemicalanalysis,andmineralogicalanalysis.Fieldobservationscanhelptoidentifythelithology,structures,andalterationpatternsoftherocks,whilegeochemicalanalysiscanprovideinformationonthechemicalcompositionandalterationhistoryoftherocks.Mineralogicalanalysis,suchaspetrographicandX-raydiffractionanalysis,canrevealthemineralogicalcompositionandtextureoftherocks.

Throughthesestudies,researchershavefoundthatthesurroundingrocksoftheHongtoushandepositaremainlycomposedofvolcanicandsedimentaryrocks,withvaryingdegreesofhydrothermalalteration.Themostsignificantalterationtypesincludesilicification,argillization,carbonatization,andsericitization.Inaddition,varioustypesofsulfideminerals,suchaspyrite,chalcopyrite,sphalerite,andgalena,arepresentinthesurroundingrocks.

ThesefindingshaveimportantimplicationsfortheexplorationanddevelopmentoftheHongtoushandeposit.Forexample,theidentificationoffavorablelithologiesandalterationpatterns,aswellasthedistributionandmineralogicalcharacteristicsofsulfidemineralsinthesurroundingrocks,canhelptotargetpotentialorebodiesandoptimizeminingstrategies.Moreover,theknowledgeofthegeologicalandmineralogicalfeaturesofthedepositcancontributetotheunderstandingoftheregionalgeologicalevolutionandprovideguidanceforexplorationinneighboringareas.

Inconclusion,thestudyofthesurroundingrocksoftheHongtoushandepositisacriticalstepinunderstandingthegeologicalandmineralogicalcharacteristicsofthedeposit.Thefindingscanprovidevaluableinformationforexplorationanddevelopment,aswellascontributetotheadvancementofregionalgeologicalresearch.Inadditiontothestudiesonsurroundingrocks,researchershavealsoinvestigatedthemineralizationprocessoftheHongtoushandeposit.Thedepositisclassifiedasavolcanogenicmassivesulfide(VMS)deposit,whichformsfromhydrothermalfluidsthatareexpelledfromamagmachamberandinteractwithseawatertoformsulfideminerals.ThemineralizationintheHongtoushandepositischaracterizedbymassivesulfidebodies,interlayeredwithvolcanicrocks,andsurroundedbyalterationzones.

Detailedstudiesonthemineralogy,texture,andgeochemistryofthesulfidemineralsinthedeposithaverevealedthatthecopperandzincsulfidesarethedominantminerals,accompaniedbyvaryingamountsofironsulfides,leadsulfides,andminoramountsofotherminerals.Thetextureofthesulfidemineralsindicatesthatthemineralizationoccurredinseveralstagesoffluidcirculation.

Moreover,researchershaveidentifiedspecificgeochemicalsignaturesthatcanbeusedtodistinguishbetweenthedifferentmineralizationstagesandtotrackthemineralizationfluids'sources.Forinstance,thesulfurisotopesandtraceelementsignaturesofthesulfidemineralscanprovideinsightsintothesourcesofthehydrothermalfluidsandtheirinteractionswiththehostrocks.

TheknowledgegainedfromthesestudiescanhelptorefinethegeologicalmodeloftheHongtoushandepositandimprovetheexplorationefficiency.Forexample,understandingthemineralizationstagesandthesourcesofthehydrothermalfluidscanassistinidentifyingpotentialtargetsforexplorationandimprovetheunderstandingofthedeposit'soverallmineralendowment.

Insummary,th