岩石学薄片鉴定ppt课件.ppt

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1、MetamorphicTexturesTexturesofRegionalMetamorphismDynamothermal(crystallizationunderdynamicconditions)Orogeny-long-termmountain-buildingMaycompriseseveralTectonicEventsMayhaveseveralDeformationalPhasesMayhaveanaccompanyingMetamorphicCycleswithoneormoreReaction

2、EventsMetamorphicTexturesTexturesofRegionalMetamorphismTectonite-adeformedrockwithatexturethatrecordsthedeformationFabric-thecompletespatialandgeometricconfigurationoftexturalelementsFoliation-planartexturalelementLineation-lineartexturalelementLatticePreferr

3、edOrientation(LPO)DimensionalPreferredOrientation(DPO)Progressivesyntectonicmetamorphismofavolcanicgraywacke,NewZealand.FromBest(1982).IgneousandMetamorphicPetrology.W.H.Freeman.SanFrancisco.Progressivesyntectonicmetamorphismofavolcanicgraywacke,NewZealand.Fr

4、omBest(1982).IgneousandMetamorphicPetrology.W.H.Freeman.SanFrancisco.Progressivesyntectonicmetamorphismofavolcanicgraywacke,NewZealand.FromBest(1982).IgneousandMetamorphicPetrology.W.H.Freeman.SanFrancisco.Progressivesyntectonicmetamorphismofavolcanicgraywack

5、e,NewZealand.FromBest(1982).IgneousandMetamorphicPetrology.W.H.Freeman.SanFrancisco.Fig23-21Typesoffoliationsa.Compositionallayeringb.Preferredorientationofplatymineralsc.Shapeofdeformedgrainsd.Grainsizevariatione.Preferredorientationofplatymineralsinamatrixw

6、ithoutpreferredorientationf.Preferredorientationoflenticularmineralaggregatesg.Preferredorientationoffracturesh.CombinationsoftheaboveFigure23-21.Typesoffabricelementsthatmaydefineafoliation.FromTurnerandWeiss(1963)andPasschierandTrouw(1996).Figure23-22.Amorp

7、hological(non-genetic)classificationoffoliations.AfterPowell(1979)Tectonophys.,58,21-34;Borradaileetal.(1982)AtlasofDeformationalandMetamorphicRockFabrics.Springer-Verlag;andPasschierandTrouw(1996)Microtectonics.Springer-Verlag.Figure23-22.(continued)Figure23

8、-23.Continuousschistositydevelopedbydynamicrecrystallizationofbiotite,muscovite,andquartz.a.Plane-polarizedlight,widthoffield1mm.b.Crossed-polars,widthoffield2mm.Althoughthereisadefinitef