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点苍山变质杂岩新生代变质-变形演化及其区域-中国地质大学(北京)
10000569/2014/030(03)085166 ActaPetrologicaSinica 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
1 1 2 1
赵春强 赵利 曹淑云 刘俊来
1 1 2 1
ZHAOChunQiang,ZHAOLi,CAOShuYunandLIUJunLai
1中国地质大学地质过程与矿产资源国家重点实验室,北京 100083
2萨尔茨堡大学地理与地质学系,萨尔茨堡 A5020
1StateKeyLaboratoryofGeologicalProcessesandMineralResources,ChinaUniversityofGeosciences,Beijing100083,China
2DepartmentofGeographyandGeology,UniversityofSalzburg,SalzburgA5020,Austria
20130819收稿,20140212改回
ZhaoCQ,ZhaoL,CaoSYandLiuJL2014CenozoicdeformationmetamorphicevolutionoftheDiancangShan
metamorphiccomplexandregionaltectonicimplicationsActaPetrologicaSinica,30(3):851-866
Abstract TheDiancangShancomplexisoneofthefourmetamorphiccomplexesalongtheAilaoShanRedRiver(ASRR)ductile
shearzoneThecomplexexperiencedalonglastinghistoryofmultipledeformationandmetamorphismduringitstectonicevolutionsince
theProterozoicWiththeCenozoicdeformationmetamorphicevolutionasthemajortopicofstudy,thispapermainlyfocusesonthehigh
grademetamorphicaluminousrocks,iethesillimanitegarnetbiotitegneiss,andafinegrainedgraniteintrudingthehighgrade
metamorphicrocksThroughmicrostructuralanalysisandparageneticassociationstudy,anupperamphibolitefaciesassemblageof
garnet+sillimanite+Kfeldspar+biotite+plagioclase±quartzandalowerpressureamphibolitefaciesassemblageofsillimanite+
muscovite+biotite+quartzwererecognizedinthehighgrademetamorphicaluminousrocksSHRIMPUPbdatingofmetamorphic
zirconsfromthehighgradegneissrevealsCenozoicgrowthofthezirconsduringthreestagesofmetamorphism,ieat542±17Ma,
315±15Maand275±12MaAtthesametime,amylonitizedfinegrainedgranitehostedinthehighgrademetamorphicrockswas
studiedmacroscopicallyandmicroscopicallytoconstrainthetimingofmetamorphismandsheardeformationofthehighgradegneisses,
andthereforeofshearingalongtheASRRshearzoneLAICPMSUPbdatingofmagmaticzirconsgivesanageof244±089Ma,
beingrepresentativeofmagmaticcrysta
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