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ID:8267679
大小:4.01 MB
页数:16页
时间:2018-03-15
《点苍山变质杂岩新生代变质 变形演化及其区域构造》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、10000569/2014/030(03)085166ActaPetrologicaSinica岩石学报点苍山变质杂岩新生代变质变形演化及其区域构造内涵1121赵春强赵利曹淑云刘俊来1121ZHAOChunQiang,ZHAOLi,CAOShuYunandLIUJunLai1中国地质大学地质过程与矿产资源国家重点实验室,北京1000832萨尔茨堡大学地理与地质学系,萨尔茨堡A50201StateKeyLaboratoryofGeologicalProcessesandMineralRes
2、ources,ChinaUniversityofGeosciences,Beijing100083,China2DepartmentofGeographyandGeology,UniversityofSalzburg,SalzburgA5020,Austria20130819收稿,20140212改回ZhaoCQ,ZhaoL,CaoSYandLiuJL2014CenozoicdeformationmetamorphicevolutionoftheDiancangShanmetamorphicc
3、omplexandregionaltectonicimplicationsActaPetrologicaSinica,30(3):851-866AbstractTheDiancangShancomplexisoneofthefourmetamorphiccomplexesalongtheAilaoShanRedRiver(ASRR)ductileshearzoneThecomplexexperiencedalonglastinghistoryofmultipledeformationandmetamorp
4、hismduringitstectonicevolutionsincetheProterozoicWiththeCenozoicdeformationmetamorphicevolutionasthemajortopicofstudy,thispapermainlyfocusesonthehighgrademetamorphicaluminousrocks,iethesillimanitegarnetbiotitegneiss,andafinegrainedgraniteintrudingthehi
5、ghgrademetamorphicrocksThroughmicrostructuralanalysisandparageneticassociationstudy,anupperamphibolitefaciesassemblageofgarnet+sillimanite+Kfeldspar+biotite+plagioclase±quartzandalowerpressureamphibolitefaciesassemblageofsillimanite+muscovite+biotite+quartz
6、wererecognizedinthehighgrademetamorphicaluminousrocksSHRIMPUPbdatingofmetamorphiczirconsfromthehighgradegneissrevealsCenozoicgrowthofthezirconsduringthreestagesofmetamorphism,ieat542±17Ma,315±15Maand275±12MaAtthesametime,amylonitizedfinegrainedgra
7、nitehostedinthehighgrademetamorphicrockswasstudiedmacroscopicallyandmicroscopicallytoconstrainthetimingofmetamorphismandsheardeformationofthehighgradegneisses,andthereforeofshearingalongtheASRRshearzoneLAICPMSUPbdatingofmagmaticzirconsgivesanageof244±08
8、9Ma,beingrepresentativeofmagmaticcrystallizationofthesynshearinggraniteFromtheapparentagepopulationsofmetamorphiczirconsfromthehighgradegneiss,itisshownthatthemetamorphicrocksfromtheDia
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