B10210ZÁVADA ET AL.: EXTREME DUCTILITY OF FELDSPAR AGGREGATESB102108.4. Comparative Rheology Between Feldspars <strong>and</strong>Quartz[47] Experimental studies show that the creep strength <strong>of</strong>feldspars deformed at dislocation creep is higher than that <strong>of</strong>quartz for the entire range <strong>of</strong> temperature conditions investigated[Shelton <strong>and</strong> Tullis, 1981; Jaoul et al., 1984; H<strong>and</strong>y,1994]. This assumption is essential in assessing rheology <strong>of</strong>polyphase rocks with different proportion <strong>of</strong> weak quartz<strong>and</strong> ‘‘strong skeleton’’ formed by feldspars in both loadbearingframework <strong>and</strong> interconnected weak layer microstructures[H<strong>and</strong>y, 1990, 1994; Schulmann et al., 1996; Ji etal., 2004; Rybacki <strong>and</strong> Dresen, 2004]. However, change <strong>of</strong>deformation mechanism in feldspars from dislocation todiffusion creep has never been considered in term <strong>of</strong>mineral strength contrast between quartz <strong>and</strong> feldspars.Exceptionally high finite strains <strong>of</strong> both feldspars surroundingmuch less elongated quartz ribbons shows well thatquartz represents the strong phase according to H<strong>and</strong>y[1990, 1994] <strong>and</strong> feldspars form interconnected weaklayers. The explanation is seen in important contribution<strong>of</strong> dislocation creep accommodated GBS mechanism to thedominant melt-enhanced grain boundary diffusion creepoperative in both feldspars that significantly decreases theirstrength with respect to quartz simultaneously deforming viadislocation creep-controlled recrystallization mechanisms.[48] Acknowledgments. This work has been kindly supported byGrant Agency <strong>of</strong> the Czech Academy <strong>of</strong> Sciences (GAAV) projectIAA3111401. J.K. appreciates the financial support <strong>of</strong> the Ministry <strong>of</strong>Education, Youth <strong>and</strong> Sports <strong>of</strong> the Czech Republic through the ScientificCentre ‘‘Advanced Remedial Technologies <strong>and</strong> Processes’’ (identificationcode 1M0554). We appreciated constructive reviews <strong>of</strong> P. Bons, J. Weertman,<strong>and</strong> an anonymous material scientist <strong>and</strong> editorial h<strong>and</strong>ling <strong>of</strong> J. C. Mutter.This study was also made possible thanks to the ANR project ‘‘LFO inorogens’’ funding as well as to financial support <strong>of</strong> CNRS (UMR 7516) toOndrej Lexa.ReferencesArzi, A. (1978), Critical phenomena in the rheology <strong>of</strong> partially meltedrocks, Tectonophysics, 44, 173–184.Baudelet, B., M. C. 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(stano@ig.cas.cz)P. Závada, Institute <strong>of</strong> Petrology <strong>and</strong> Structural Geology, CharlesUniversity, Prague, Czech Republic. (zavada@natur.cuni.cz)15 <strong>of</strong> 15293
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DTD 5ARTICLE IN PRESSJournal of Str
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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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Author's personal copyK. Schulmann
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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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HEAT SOURCES AND EXHUMATION MECHANI
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J. metamorphic Geol., 2011, 29, 53-
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J. metamorphic Geol., 2005, 23, 649
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CONTRASTING TEXTURAL RECORD OF TWO
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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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110 J. FRANĚK ET AL.(a)(b)(c) (d)
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112 J. FRANĚK ET AL.Table 1. Repre
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116 J. FRANĚK ET AL.(a)(b)Fig. 10.
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126 J. FRANĚK ET AL.development of
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128 J. FRANĚK ET AL.Behrmann, J.H.
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130 J. FRANĚK ET AL.Southern Bohem