The equilibration of high-angle grain boundaries in dynamically recrystallized quartz: the effect of crystallography and temperature

Kruhl, Jörn H.; Peternell, Mark

doi:10.1016/s0191-8141(01)00096-7

Cited by 58 publications

(31 citation statements)

References 15 publications

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“…8a, 11), as commonly observed in high-grade metamorphic rocks (Voll 1960;Kruhl and Peternell 2002). Quartz grains with their c-axis oriented at low angle to the stretching lineation exhibit equally developed prism-and basis-parallel subgrain boundaries (''chessboard'' SGB pattern, Kruhl 1996), indicating that quartz deformed in the high-quartz field ( Fig.…”

Section: Felsic Granulitesmentioning

confidence: 88%

Late Palaeozoic deformation of post-Variscan lower crust: shear zone widening due to strain localization during retrograde shearing

Zibra

Kruhl

Braga

2009

Int J Earth Sci (Geol Rundsch)

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The Santa Lucia Shear Zone (SLSZ, Corsica) is a granulite-facies Permian shear zone that developed after the emplacement of a deep-seated gabbroic intrusion. New structural data shows that the SLSZ results from the juxtaposition of three spatially distinct mylonite belts, which are the product of the interaction between magmatism, metamorphism and shearing over a temperature range from *800 to *400°C. During the earlier high-grade deformation stage, which was accompanied by decompression from *7 to *5 kb at *800°C, the SLSZ has accommodated high finite strain on a shear zone C1 km wide. Strain became increasingly localized as temperature decreased, but rather than reactivating pre-existing shear zones as commonly expected, younger mylonites expanded into previously unsheared rock, extending the total width of the shear zone. The zonation of different fabrics across the SLSZ suggests that pre-existing compositional and grain size heterogeneities in the starting material played a key role in governing superposed generations of shear zones.

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Section: Felsic Granulitesmentioning

confidence: 88%

Late Palaeozoic deformation of post-Variscan lower crust: shear zone widening due to strain localization during retrograde shearing

Zibra

Kruhl

Braga

2009

Int J Earth Sci (Geol Rundsch)

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“…This effect may be exacerbated by the presence of stable, compositionally distinct, nanometre-scale films on grain boundaries with particular orientations (Baram et al 2011). Anisotropy also means that the minimum energy microstructure may include planar as well as curved interfaces (Herring 1951;Vernon 1968;Waff and Faul 1992;Kruhl 2001;Kruhl and Peternell 2002;Leibl et al 2007). All data in both (b) and (c) is based on populations of 100 measurements.…”

Section: Microstructural Evolution In the Sub-solidusmentioning

confidence: 95%

“…4.1d). Macroscopically these surfaces look smooth, but in detail they consist of planar segments, with faceting down to the nanometer scale (Kruhl 2001;Kruhl and Peternell 2002). Apparently, minimisation of the proportion of high-energy atoms is not achieved by the formation of smoothly curved boundaries, but by the formation of many local low-energy facets (interspersed with local high-energy adjustment segments) that macroscopically resemble curved boundaries.…”

Section: Crystal Shapementioning

confidence: 97%

“…All minerals of geological relevance are anisotropic to some extent (e.g. Kretz 1966;Vernon 1968;Waff and Faul 1992;Laporte and Watson 1995;Kruhl 2001;Schafer and Foley 2002;Kruhl and Peternell 2002;Leibl et al 2007), so the equilibrium shape of both isolated grains and of melt inclusions is generally non-spherical. The equilibrium shape may vary, depending on the medium surrounding isolated grains or the contents of melt inclusions, via the action of orientation-specific adsorption at the fluid-solid interface (Camel et al 1981;Balluffi 1979).…”

Section: Crystal Shapementioning

confidence: 99%

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The Influence of Interfacial Energies on Igneous Microstructures

Holness

Vernon

2015

Springer Geology

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The thermal history of igneous rocks is encoded in their microstructures via the control by cooling rate on crystal growth. If temperatures remain close to the liquidus, with small undercoolings, growth rates are low and microstructures are strongly affected by constraints imposed by interfacial energies. The minimisation of interfacial energy results in the melt topology becoming a function of dihedral angle and porosity. Further effects include the loss of the smallest crystals (Ostwald ripening), though this process is restricted to very small grainsizes. For large crystals, interfacial energy controls the microstructure by determining the shapes, but not the size or number of crystals. In mafic-ultramafic magmas, minerals with a larger structural anisotropy (e.g., plagioclase) commonly form crystals with low-energy faces, with or without some rounding of corners, whereas minerals with lower structural anisotropy (e.g., olivine) form crystals with rounded to locally planar boundaries.Microstructures in partially solidified material from lava lakes and entrained glassy enclaves suggest that interfacial energies play only a minor role in the supersolidus of rapidly-cooled or coarse-grained rocks. They are most important for slowly-cooled bodies of hot magma crystallizing as crystallographically simple minerals, especially adcumulates in layered complexes.Interfacial energies may also play a role in the sub-solidus, leading to the development of a granular microstructure in some adcumulates. This is, however, only important for very fine-grained rocks such as chill zones, or for monomineralic rocks. Elsewhere there is little or no evidence for significant grain growth in the sub-solidus, demonstrating that the end-stage of microstructural equilibration generally is not reached in crustal layered intrusions.

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“…Il est admis que la cristallisation, la recristallisation et la restauration des cristaux de quartz, dépendent de la température, de la présence ou de l'absence de fluide et des contraintes appliquées lors de ces différents processus (Passchier et Trouw, 1998). L'examen microscopique des structures symptomatiques dans les cristaux de quartz et de leurs interactions entre elles pourrait aider à comprendre les processus de mise en place des veines de quartz minéralisées, et des processus subséquents à cette mise en place (Hirth et Tullis, 1992;Lloyd et Knipe, 1992;Lloyd et Freeman, 1994;Dong ei al., 1995;Passchier et Trouw, 1998;Nishikawa et Takeshita, 2000;Essarraj et al, 2001;Hippertt et Tohver, 2002;Kruhl et Petemell, 2002;Stipp et al, 2002;Mancktelow et Pennacchioni, 2004 (Mernagh, 2001). …”

Section: Altérations Et Sulfuresunclassified

Caractérisation des gisements d'or filoniens concordants dans les turbidites plissées de Jinping, sud-est Guizhou (Chine) /

Keïta¹

2007

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The equilibration of high-angle grain boundaries in dynamically recrystallized quartz: the effect of crystallography and temperature

Cited by 58 publications

References 15 publications

Late Palaeozoic deformation of post-Variscan lower crust: shear zone widening due to strain localization during retrograde shearing

Late Palaeozoic deformation of post-Variscan lower crust: shear zone widening due to strain localization during retrograde shearing

The Influence of Interfacial Energies on Igneous Microstructures

Caractérisation des gisements d'or filoniens concordants dans les turbidites plissées de Jinping, sud-est Guizhou (Chine) /

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