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3. Quantitative analyses of metamorphic microstructures 30preferred orientations of grain boundaries in conjunction with their frequencies. Thismay help to better understand the mobility of grain boundaries and precipitationsor removal of different mineral phases.The new open platform, object-oriented MATLAB ® toolbox PolyLX developedby myself, provide several core routines for data exchange, visualization and analysisof microstructural data, which can be run on any platform supported by MATLAB ® .Detailed descriptions of toolbox routines and methods of implementation of newtechniques could be find on dedicated webpage http://petrol.natur.cuni.cz/ ondro.The technique was first used in Lexa et al. (2005) where we examined the problemof microstructural maturity related to the duration of two metamorphic events whichoccurred at similar pressure and temperature conditions. We analysed samples of amphibolitesand tonalitic gneisses that were affected by ductile deformation associatedwith emplacement of thin Carboniferous granodiorite sill. This event was controlledby intense solid state recrystallization due to intense deformation triggered by heatingeffect of adjacent granodiorite sill. On the other hand we studied similar rocks (amphibolitesand tonalitic orthogneiss) that recrystallized during long lasting evolution ofCambro-Ordovician intracontinental rift. This event reveals much longer thermal timescale compared to the Carboniferous event for surprisingly similar PT conditions. The
3. Quantitative analyses of metamorphic microstructures 31Figure 3.1: N 0 -Gt plot showing CSD evolution of plagioclase and hornblende. Thisfigure showing two contrasting positions for metamorphic events with different durations.Long-lived mature microstructures are grouped along so-called fabric attractor.microstructural analysis covered digitization of large number of samples which weresubsequently handled using PolyLX software. As a result of this analysis we discoveredthat the Carboniferous event was associated with grain size distribution whichin CSD space shown dominance of nucleation process with respect to slow growth rate.Increase of ambient temperature correlates with decrease in nucleation density accompaniedwith increase growth (Fig. 3.1). In contrast the Cambro-Ordovician rocks revealedpre-dominance of growth process over the nucleation. Our data plot on continuous curvein the CSD space which clearly indicates absence of Ostwald ripening and dominance oftextural coarsening by DeHoff’s communicating neighbours theory, which governs thechange in shape of CSD curve. The analysis show that the time matters in mineral microstructuresleading to development of grain size distribution which can be consideredas a grain size attractor (Fig. 3.1).This study had shown for the first time the power of grain contact frequency analysis.The rocks deformed by short lived Carboniferous pulse reveal aggregate distributionof both mafic and felsic phases. However, the similar lithologies experiencing long lastingCambro-Ordovician event recorded evolution driving contact frequencies towardsthe field of regular distribution. The process of increase of unlike contacts in rocks is
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Page 58 and 59: Bibliography 46Skrzypek, E., Štíp
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Table 1Statistical values of the qu
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Table 2Summary of parameters derive
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J. metamorphic Geol., 2008, 26, 273
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EXHUMATION IN LARGE HOT OROGEN 275m
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Probabi l irequencyProbabi l ireque
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EXHUMATION IN LARGE HOT OROGEN 279y
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EXHUMATION IN LARGE HOT OROGEN 281N
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EXHUMATION IN LARGE HOT OROGEN 283w
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EXHUMATION IN LARGE HOT OROGEN 285a
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EXHUMATION IN LARGE HOT OROGEN 287w
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EXHUMATION IN LARGE HOT OROGEN 289T
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EXHUMATION IN LARGE HOT OROGEN 291O
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EXHUMATION IN LARGE HOT OROGEN 293r
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EXHUMATION IN LARGE HOT OROGEN 295B
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EXHUMATION IN LARGE HOT OROGEN 297R
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Author's personal copyK. Schulmann
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J. metamorphic Geol., 2011, 29, 79-
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HEAT SOURCES AND EXHUMATION MECHANI
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J. metamorphic Geol., 2005, 23, 649
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CONTRASTING TEXTURAL RECORD OF TWO
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Contrasting microstructures and def
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TEXTURES OF NATURALLY DEFORMED META
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1.0--0.9__Mg~(Mg2++Fe2+)9 Core of p
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' ~'-----2~--~----TEXTURES OF NATUR
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ClickHereforFullArticleJOURNAL OF G
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B10406SCHULMANN ET AL.: RHEOLOGY OF
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ORIGIN OF FELSIC MIGMATITES 31Ó 20
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ORIGIN OF FELSIC MIGMATITES 33durin
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ORIGIN OF FELSIC MIGMATITES 35(a)Ty
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ORIGIN OF FELSIC MIGMATITES 37(a)Pl
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ORIGIN OF FELSIC MIGMATITES 39Grain
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ORIGIN OF FELSIC MIGMATITES 41(a)(b
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ORIGIN OF FELSIC MIGMATITES 43(a)(b
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ORIGIN OF FELSIC MIGMATITES 45Fig.
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ORIGIN OF FELSIC MIGMATITES 47produ
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ORIGIN OF FELSIC MIGMATITES 49stron
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ORIGIN OF FELSIC MIGMATITES 51Cmı
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ORIGIN OF FELSIC MIGMATITES 53easte
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104 J. FRANĚK ET AL.in terms of th
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106 J. FRANĚK ET AL.Fig. 2. Struct
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130 J. FRANĚK ET AL.Southern Bohem
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