河南獨山玉礦的成礦構(gòu)造背景及成因.pdf

1、同濟大學海洋地質(zhì)與地球物理系碩士學位論文河南獨山玉礦的成礦構(gòu)造背景及成因姓名：趙娟申請學位級別：碩士專業(yè)：海洋地質(zhì)指導教師：廖宗廷江富建19990301THETECTONICBACKGROUNDANDGENESIS0FDUSHANJADEDEPOSITAbstractFromtheaspectofregionalgeotectonics，thetectonicbackgroundandgenesisofDushanJadeisstudi

2、edinthispaperbyusingcomprehensivetheoriesandmethodsofmineralogy，petrology，crystalmineralogy，depositgeologyandgeochemistryAndonbasisofthis，thejadedeposit—formingmodeisestablishedandnewdepositispredictedStudyshowsthattheDu

3、shanJadedepositisthesyntheticproductoftectonic，magmatismandmetamorphismwithspecificgeotectonicbackgroundofinteractionbetweenHuabeiPlate，HuananPlateandQinlingorogenicbeltThebasicprocessesofdepositformingareasbelows：1Prior

4、tothecollisionandorogenicmovement，Qinlingorogenicbeltwasapaleo—oceanplatewhichiscalledtemporarilyQinlingOceanPlateDuringtheearlystageofQinlingOceanvolcanicactivitywasfrequentandformedolivinekomatiite，gabbroandpyroxenite；

5、whereasinthelatestagewiththesubductionofHuananPlatetoHuabeiPlate，theQinlingOceanclosedwiththickeningofoceandeposits，andatthesametimemagmainmantledifferentiatedandviscosityincreasedwhichresultedintubeofmagmaascendingtOoce

6、anfloorwasjammedanddeepmantlemagmachamberbegantodifferentiategabbro，pyroxeniteandplagioclasitemagmas，andatlastgabbroandpyroxeniteformedduringthelateintrusiveactivityTheNanyangrockpillarwasformedinsuchbackgoundandprovided

7、sufficientmaterialforDushanJadeformation2、MththecloseofQinlingOcean。theQinlingorogenicmovementbeganAccompaniedbyunderthrustingandorogenics，theseplutonicrockshhru曼eduptoacertainpositionfirstDuringthisprocess，theseplutonic

8、rockswerebrokenintopiecesbythehighpressureduringtheorogenicmovementandbegantOdifferentiateunderhydrotherealprocessThenohosesconcentratedinthebrokenrockswerethedominantpartofDushanJadeHydrothermalactivityinorogenicperiodw

9、asintense，andstructurefracturesamonggabbro，pyroxeniteandplagioclasitewerefilledandreplaced，andunder350500℃DushanjadeformedThedominantcompositionofiadeiSanorthitecontainingfewreplacedlabrodoriteandbytowniteremaindersFrome

10、arlytolatestagemagmatichrdrothermallcachedmajorelementssuchasCaCrFeandTiandcontentsofsomeminorcolorcausingelementsincreased，resultinginthejadecolorvariedfromcolorless，white，greenandpurpletobluewithplagioclaseseriesrangin

11、gfromA‰toAnl∞3WithfurtherreplacederosionofgranitemagmatichydrothermalinYanshanianstage，partofanorthiteerodedtozoisite，andbiotitetOmuscoviteKeyword：DushanJade，oredeposit，platetectonic，dynamicalmetamorphism，mylonite，hydrot