鄂尔多斯盆地东胜铀矿区主要后生蚀变的地质地球化学特征及成因探讨

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1、西北大学硕士学位论文鄂尔多斯盆地东胜铀矿区主要后生蚀变的地质地球化学特征及成因探讨姓名：胡亮申请学位级别：硕士专业：矿物学、岩石学、矿床学指导教师：吴柏林20100611TheGeological-geochemicalCharacteristicsandGenesisoftheMainEpigeneticAlterationintheDongshengUraniumAreaoftheOrdosBasinAbstractmaintypesoftherockalterationinstudyareaincl

2、udegreenalteration，carbonatization，oxidationalteration，bleachingphenomenon．TogetherwithuraniumenrichmentinDongshengdeposit,formsauniqueseriesoffluidphenomenon．Thepaperdealswithgeological-geochemicalcharacteristicsandgenesistoprovidearichunderstandingingen

3、erationandaccumulationofuranium．Understrongreducingenvironmentcondition,theearlyinterlayeroxidationzonewasreformedandformedore—controllinggreenalterationzoneaftertwicedeoxidizations．Thesetwosystemsbothhaveloworganiccarbon,lowZS，highTh／U．Uraniummineralizat

4、edrockshavethehighestorganiccarbonandthelowestTh／U．ThebleachingphenomenononthetopofYah’anFormationwasformedafterhypergeneoxydicrocks’reductionandreformationinreducingenvironment．ThebleachingrockshavehighTh／UandlowTFe．Inshort，greenalteration，bleachingpheno

5、menonanduraniummineralizatingareformedinarelativelystrongenvironmentwhichrelatestolargescalehydrocarbondissipationinthisarea．TheinclusionsinthecalciteiIl”calcifiedwood”toobserveandtestthecompositionbytheLaserRamanMicroprobe．thetemperatureistested、析Ⅱ1thein

6、clusionhomogenizationmethod．Theresultsshowedthatthefluidmainlycontainedgascomponentandderivedfromhydrothermalfluidsi11thesedimentarybasin．BasedonthefluidinclusionsstudyiIlthesecondaryconcrescenceofquartzedgeandcalcitecementsinothertypesofrockalterations，i

7、tisfoundthatinclusionshavelotsofsaltwaterinclusionsandfluidcomposedwithnormaltemperatureatmosphericwater．Itisconcludedthatthealteratedfluidinthisareaconsistsofatmosphericwater,epithermalanddissipationhydrocarbon．Basedonthecarbonandoxygenisotopeanalyzingin

8、lenticularcarbonateand”calcifiedwood”，itisfoundthatcarbonSOurCerelatesfluidactionoforganicmatter；Sulfurisotopeanalysisinpyriteshowedthatsulfursourcehasthecharacteristicbetweenthebiologicalbacteriaandcoal；Thehydrogen