青海省都兰县瓦勒尕金矿地质特征与找矿标志研究-豆柴文库

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青海省都兰县瓦勒尕金矿地质特征与找矿标志研究
青海省都兰县瓦勒尕金矿地质特征与找矿标志研究
Abstract
TheWalegajingolddepositislocatedinDulanCounty,QinghaiProvince.Thegeologicalcharacteristicsandprospectingindicatorsofthedepositarestudiedinthispaper.Throughfieldinvestigation,geologicalmapping,andmineralogicalanalysis,itisfoundthattheWalegajingolddepositismainlydistributedalongthecontactzonebetweentheLateDevonianMatoqinFormationSandstoneandCarboniferousDajiangouFormationGranite.Theorebodyisgenerallystructural-controlledandconsistsofvein-type,disseminated-type,andbreccia-typeoreveins.Themainmineralassemblagesincludepyrite,chalcopyrite,galena,sphalerite,andgold.
ThemainprospectingindicatorsoftheWalegajingolddepositaresummarizedasfollows:(1)favorablegeologicalbackground,includingappropriatelithology,structure,andtectonicsetting;(2)mineralizationalterationzones,includingsilicification,sericitization,pyritization,andcarbonatization;(3)highgradeorezoneswithgoldgradesgreaterthan10g/t;(4)geochemicalanomaliesofgold,silver,copper,lead,andzincinstreamsediments,soils,androcks;(5)geophysicalanomalies,includingmagneticandIPanomalies.
Introduction
TheWalegajingolddepositislocatedinDulanCounty,QinghaiProvince,China.Itisalarge-scalegolddepositthathasbeenexploredinrecentyears.Thedepositischaracterizedbymultipletypesofores,complexgeologicalconditions,anddiverseprospectingindicators.Inthispaper,thegeologicalcharacteristicsandprospectingindicatorsofthedepositarediscussed.
GeologicalCharacteristics
TheWalegajingolddepositislocatedinthecontactzonebetweentheLateDevonianMatoqinFormationSandstoneandCarboniferousDajiangouFormationGranite.Themineralizationmainlyoccursinthecontactzoneandoccursasveins,disseminatedorebodies,andbrecciabodies.Therocksinthecontactzonearemainlysandstones,granites,andtheiralteredrocks.
Accordingtothegeologicalmappingandanalysisoftheorebody,itisbelievedthatthemainore-controllingfactorsare:(1)thecontactzonebetweentheMatoqinFormationSandstoneandtheDajiangouFormationGranite;(2)thestructuralzoneofthecontactzone;(3)theim