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2. Mechanisms of lower crustal flow and its thermal and mechanical implications 28Skrzypek, E., Štípská, P., Schulmann, K., Lexa, O., Lexová, M., 2011b. Progradeand retrograde metamorphic fabrics - a key for understanding burial and exhumationin orogens (Bohemian Massif). Journal of Metamorphic Geology 29 (4), 451–472.Skrzypek, E., Schulmann, K., Štípská, P., Chopin, F., Lehmann, J., Lexa, O.,Haloda, J., 2011a. Tectono-metamorphic history recorded in garnet porphyroblasts:insights from thermodynamic modelling and electron backscatter diffractionanalysis of inclusion trails. Journal of Metamorphic Geology 29 (4), 473–496.Chopin, F., Schulmann, K., Štípská, P., Martelat, J., Pitra, P., Lexa, O., Petri,B., 2011b. Microstructural and petrological evolution of a high pressure graniticorthogneiss during continental subduction (Orlica-Śnieżnik dome, NE BohemianMassif). Journal of Metamorphic Geology, submitted.Štípská, P., Chopin, F., Skrzypek, E., Schulmann, K., Lexa, O., Pitra, P., Martelat,J., Bollinger, C., 2011. Juxtaposition of eclogite-facies and mid-crustal rocksduring exhumation: relative role of erosion and crustal scale folding in a continentalwedge (Orlica-Śnieżnik dome, Bohemian Massif). Journal of MetamorphicGeology, submitted.
Chapter 3Quantitative analyses ofmetamorphic microstructures,their visualization and statisticsWithin the framework of microstructural analyses carried out at the Institute of Petrologyand Structural Geology I developed a code to characterise and quantify deformationand metamorphic microstructures. This early version allowed quantification of strainintensity using digitized grain boundaries similar to PAROR and SURFOR methods ofPanozzo (1983, 1984) ans was for the first time used in microstructural styudy of deformedmarbes by Ulrich 92. However, we have quickly recognized the potential of thetechnique and I have implemented a range of statistical methods to quantify mineralmicrostructures of polyphase and monophase recrystallized aggregates. It is in particularthe analysis of grain sizes combined with CSD approach which allows determiningsome kinetic characteristics of grain nucleation and growth. The second approach implementedroutinely in the PolyLX code is the analysis of grain boundary frequencieswhich allow evaluating the relative importance of surface energy of mineral aggregate inquantifying the degree of deviation of grain contact frequencies from random distribution.The textural analysis is a powerful, but underused tool of petrostructural analysis.Except acquirement of common statistical parameters, this technique can significantlyimprove understanding of processes of grain nucleation and grain growth,can bring insights on the role of surface energies or quantify duration of metamorphicand magmatic cooling events as long as appropriate thermodynamical data forstudied minerals exists. This technique also allows systematic evaluation of degree of29
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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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HEAT SOURCES AND EXHUMATION MECHANI
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EXTRUSIONOFLOWERCRUSTINVARISCANOROG
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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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B10210ZÁVADA ET AL.: EXTREME DUCTI
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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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130 J. FRANĚK ET AL.Southern Bohem
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