2023年全國(guó)碩士研究生考試考研英語一試題真題(含答案詳解+作文范文)_第1頁
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1、北京科技大學(xué)碩士學(xué)位論文阿爾泰大東溝鉛鋅礦床變形變質(zhì)及碳質(zhì)流體研究姓名:褚海霞申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):礦物學(xué)巖石學(xué)礦床學(xué)指導(dǎo)教師:徐九華20091220北京科技大學(xué)碩十學(xué)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

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