楚雄盆地充填序列及砂巖銅礦成礦模式研究.pdf

1、中南工業(yè)大學博士學位論文楚雄盆地充填序列及砂巖銅礦成礦模式研究姓名：陳根文申請學位級別：博士專業(yè)：礦產普查與勘探指導教師：胡延延陳國達19990601r0ASTUDYONTHEFOLLINOSEQUNCEANDMETALOGENICMODELOFSANDSTONECOPPERDEPOSITSINCHUXIONGBASINAbstractThedevelopmentofchuxiongbasinhadexperiencedfourstag

2、es：(1)Upliftedstageduringlatepermian(21DownwarpingandsudsidencestageduringlateTriassic3Faultdepressionstageduringjurassic—Cretaceous；(4)TerminationstageduringpaleogeneBasedonstudiesforsedimentaryoutcropandpartearthquackd

3、atathreesecond—ordersequencesandeleventhird—ordersequenceshavebeenrecognisedsandstonecopperdepositsarecontrolledbythefacesofsequenceandboundarygrowthfaultscopperdepositsisconnectedwithlowstandsystemtract1293815tonesofcop

4、perand3315tonesofsilverhavebeenexploredintheredbedogchuxiongbasinThegradeofcopperisbetween05—2％，ThemaindepositsincludeHaojiahe、liuzhou、wadizhou、dacunandtunshanSandstonecopperdepositsOCCUrintheredbedofJKEtotalof16bedshave

5、copperminerdization，butmainmineralixationconcentrateinGaofengshigroupwadizhoumember，MatoushangroupliuzhoumemberofcretaceousandJiangdihegroupDacunmemberofpaleogeneEnvironmentofMineralizationisfluviationfaciesornearbydelta

6、plainfacies，especiallyexisttogatherwithlowercoallayerandevaporate，MineralizationcanbedividedbysandstonetypeandshaletypeTheorebodiesofsandstonetypeappeallens、ribbonandalittleofveinlet，thethicknessoforebodiescanreachto36mT

7、heorebodiesofshaletypeappearstratiform，thethicknessoforebodieshaveonlyabout06m。thelensshapedarebodiesoftenformedroll—frontjustlikemanyuraniumarebodiesOCCUrinoxidizing—reductionboundaries，arecontrolledbystrata，andlocallyc

8、rosscutstrataThemainoremineralsarechalopyrite、bornite、chalopyrite、pyriteandnaturesilveraremineralzonedfromredbedtograybedappearchalcocite、bornitechaleopyriteandpyritechalcociteoccurinfrontoforebodiessulfurisotoperesultfo

9、rcoppersulfidesshowlight584Svalues(116‰I，indicativeofbiogenicsulfatereduction5”C(一8l‰indicatecarbonderivedfromorganiccarbon，6DH2。(一64卜883‰)5180(156_2086‰)representarefluidderivedfromrainwaterLeadisotopestudiesshowcopperc

10、omedfromhostedrockTotalREEinxediment—hostedis7919443ppm，￡Ce／￡Yratioisbetween3to673ThesandstonecopperdepositsformedbyhysterogenictwolayersbrinewaterreactedWhenhypergenicwatertransporteddownward，itreachedwithevaporateandre

11、dbed，andformedc“prifetiousoxicbrine，Groundwmterreactedwithlowerrocktoformsulfur—richedreductionfluid，ThesetwofluidmeetedandreactedeachotherthendepositedzonedcopperdepositsKeyWordsChuxiongbasLnsequencestratigraphysandston