36581.阿爾泰大東溝鉛鋅礦床變形變質及碳質流體研究

1、北京科技大學碩士學位論文阿爾泰大東溝鉛鋅礦床變形變質及碳質流體研究姓名：褚海霞申請學位級別：碩士專業(yè)：礦物學巖石學礦床學指導教師：徐九華20091220北京科技大學碩十學位論文StudyonDeformation，metamorphismandcarbonicfluidsoftheDadonggouLeadZnicDeposit，AitayAbstractneDadonggouLead—Zincdepositisoneofthemass

2、ivesulfidedepositsintheDevonianKelangvocanicsedmentarybasininthesouthernmarginofChineseAltaidsTheorebodies，controlledbyregionalAbagong—KurtiFaultzone，occurinlayersinthesecondlithologicalunitofupperKangbutiebaoFormationwh

3、ichconsistsofcalcareoussandstones，biotiteschistsandchloriteschistsDuringCarboniferous—Permianorogenythedeposithasexperiencedregionaltectonic—hydrothermalmetamorphismThisarticlefocusedonthedeformationandmetamorphiccharact

4、eristicsofthehostrocksandores，andthecarbonicfluidinclusionoverprintsAdetailedstudywasconductedusingthemethodsincludingfieldsurveys，petrologyandmineralogy，SEMtest，stableisotoperesearch，microthermometryoffluidinclusions，Re

5、manandSRXRFanalysisMainconclusionsweredrawnasfollowings：MicroscopicobservationshowsthatthehostrocksandoreshaveexperiencedintensivedeformationandmetamorphismFish—shapedbiotitecanbecommenlyfound，andquartzgrainswerestretche

6、dtolens，eye—ballshapesandSOon；sphaleriteandgalenawereoftenmodifiedorcutbysomemetamorphicmineralssuchasbiotite，chloriteandgarnetThestructuresoffracturing，pressureshadowpressuresolutionandovergrowthinoremineralswerecommonB

7、asedonthesephenomenons，twometallogenicperiodsCanbeidentifiedThefirstismarinevolcanicsedimentaryperiod，andthesecondismetamorphichydrothermalperiodFluidinclusionsinthemetamorphicquartzveinsaremainlycarbonicfluidinclusions(

8、C02一N2=t=CH4)，mostlyoccurringaslinearorplanar，ribbondistributionThemiCrothermometryofcarbonicfluidinclusionsshowsthatTm，c02=一825℃～一594“C，Thc02=402℃～20。30C，withdensitiesrangingfromO759／cm3to1159／cm’TheC02一H20fluidinclusio

9、nsassociatedwithcarbonicinclusionshave209℃～459℃ofhomogeneoustemperatures，andtheminimumtrappingpressuresofcarbonicfluidinclusionsareestimatedtobe11OMPa～540MPanissuggestedthatthecarbomcfluidinclusionsmayberelatedtosynoroge

10、nicmetamorphismandCall’tbeoriginatedfromsubmarineexhalationC02richfluidsmightbetheregi。onalfluidsderivedfromorogenyinKelangBasin，whichwereactiveduringthedeformationandmetamorphisminrocksandores，espesciallyingoldmineraliz