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中国东北黑龙江杂岩体蓝闪石片岩岩石学研究(英文).docx

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中国东北黑龙江杂岩体蓝闪石片岩岩石学研究(英文) Abstract: ThestudyaimedtoinvestigatethepetrologyofblueschistfaciesrocksintheHeilongjiangComplexofnortheasternChina.TheresultsshowthattheHeilongjiangComplexconsistsofoceanicandvolcanicsequenceswhichweresubjectedtoregionalmetamorphismanddeformation.Theblueschistfaciesrocksaremainlycomposedofglaucophane,lawsonite,andepidote,withminoramountsofalbite,titanite,andchlorite.Thetexturesindicatethattherocksunderwenthigh-gradedeformationwithevidenceofmylonitizationandretrogrademetamorphism.Thermodynamiccalculationssuggestthattheblueschistfaciesconditionswereachievedatpressuresof1.5-2.5GPaandtemperaturesof250-400°C.ThefindingsimplythattheHeilongjiangComplexwasformedinasubductionzoneduringtheevolutionofthePaleo-AsianOcean. Introduction: TheHeilongjiangComplexisamajorpartofthenortheasternChineseSongnenBlock,whichcomprisesthemajorpartofthePaleoproterozoiccrustintheNorthChinaCraton.Thecomplexconsistsofoceanicandvolcanicsequencesthatformedbetween1.9and1.8billionyearsago(Ma)inthePaleo-AsianOcean.Moreover,thecomplexexperiencedregionalmetamorphismanddeformationduringthelateArcheantoPaleoproterozoicperiods.ThestudyaimedtoinvestigatethepetrologyoftheblueschistfaciesrockintheHeilongjiangComplexofnortheasternChina.Thestudyassessedthemineralogicalcomposition,textures,andthermodynamicconditionsduringtheformationoftheblueschistfaciesrock. Methodology: ThestudyassessedthepetrologicalandmineralogicalfeaturesoftheblueschistfaciesrocksintheHeilongjiangComplex.ThesampleswerecollectedfromtheFuyuareainnortheasternChina.Thesampleswerestudiedunderapolarizingmicroscope,scanningelectronmicroscope,andX-raydiffractometer.Geochemicalanalysiswasconductedusingelectronprobemicroanalysisandinductivelycoupledplasmamassspectrometry.ThermodynamiccalculationswerealsodoneusingthePerple_Xsoftwarebasedonfieldobservationsandpetrologicaldata. Results: TheblueschistfaciesrocksintheHeilongjiangComplexcompriseofglaucophane,lawsonite,andepidote,withminoramountsofalbite,titanite,andchlorite.Thesemin