Calcite textures, microstructures and rheological properties of marble mylonites in the Bancroft shear zone, Ontario, Canada

Busch, Jay P.; Pluijm, Ben A. van der

doi:10.1016/0191-8141(94)00092-e

Cited by 58 publications

(23 citation statements)

References 30 publications

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“…Busch and van der Pluijm (1995) reported identical calcite microstructures to those presented here and showed that development of such microstructures from a coarse-grained protolith was associated with a consistent change in δ 18 O values for recrystallized calcite. They interpreted this relationship as reflecting large fluid fluxes during mylonitization concomitant with fluid-assisted grain boundary sliding.…”

Section: Vein Emplacement and Subsequent Deformation During Cyclic Frsupporting

confidence: 77%

“…11). The coupling between grain size reduction and changes in calcite microstructures also suggests a switch in dominating deformation mechanisms during reactivation of the veins-from sub-grain rotation to grain boundary sliding (e.g., Bestmann and Prior, 2003;Busch and van der Pluijm, 1995;Schmid et al, 1977). This interpretation is supported by the presence of small cavities at grain triple junctions in the calc-ultramylonite and dilatation of favorably oriented grain boundaries ( Fig.…”

Section: Vein Emplacement and Subsequent Deformation During Cyclic Frmentioning

confidence: 83%

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Effects of frictional–viscous oscillations and fluid flow events on the structural evolution and Re–Os pyrite–chalcopyrite systematics of Cu-rich carbonate veins in northern Norway

et al. 2015

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Section: Vein Emplacement and Subsequent Deformation During Cyclic Frsupporting

confidence: 77%

Section: Vein Emplacement and Subsequent Deformation During Cyclic Frmentioning

confidence: 83%

Effects of frictional–viscous oscillations and fluid flow events on the structural evolution and Re–Os pyrite–chalcopyrite systematics of Cu-rich carbonate veins in northern Norway

et al. 2015

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“…For example, the addition of quartz grains to experimental charges increases the threshold strain marking the onset of steady-state flow in the carbonate matrix and expedites the consumption of calcite porphyroclasts (Dresen et al 1998;Rybacki et al 2003). Pore fluids weaken the rock, particularly at T≤600°C, by enhancing dilatation and promoting grain-boundary sliding, which has a randomizing textural effect (Busch and van der Pluijm 1995;De Bresser et al 2005). Another important, but poorly understood from the standpoint of deformation, aspect of fluid-rock interaction is element diffusion and mineral reactions (Burlini and Bruhn 2005) that will most certainly take place during deformation of such complex rocks as carbonatites (see Textural record of the postmagmatic evolution of carbonatites).…”

Section: Textural Record Of Deformation In Carbonatitesmentioning

confidence: 97%

Calcite and dolomite in intrusive carbonatites. I. Textural variations

2015

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Carbonatites are nominally igneous rocks, whose evolution commonly involves also a variety of postmagmatic processes, including exsolution, subsolidus re-equilibration of igneous mineral assemblages with fluids of different provenance, hydrothermal crystallization, recrystallization and tectonic mobilization. Petrogenetic interpretation of carbonatites and assessment of their mineral potential are impossible without understanding the textural and compositional effects of both magmatic and postmagmatic processes on the principal constituents of these rocks. In the present work, we describe the major (micro)textural characteristics of carbonatitic calcite and dolomite in the context of magma evolution, fluid-rock interaction, or deformation, and provide information on the compositional variation of these minerals and its relation to specific evolutionary processes.

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“…1). On this basis, it has been proposed that grain size reduction by dynamic recrystallization can bring about a switch from grain size insensitive (GSI) dislocation creep to grain size sensitive (GSS) diffusion creep (Schmid 1982;Rutter and Brodie 1988;Furlong 1993;Busch and Van der Pluijm 1995;Vissers et al 1995). These two mechanisms act as parallel-concurrent processes, hence the fastest controls creep (Poirier 1985).…”

Section: Introductionmentioning

confidence: 98%

Grain size reduction by dynamic recrystallization: can it result in major rheological weakening?

2000

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It is widely believed that grain size reduction by dynamic recrystallization can lead to major rheological weakening and associated strain localization by bringing about a switch from grain size insensitive dislocation creep to grain size sensitive diffusion creep. Recently, however, we advanced the hypothesis that, rather than a switch, dynamic recrystallization leads to a balance between grain size reduction and grain growth processes set up in the neighborhood of the boundary between the dislocation creep field and the diffusion creep field. In this paper, we compare the predictions implied by our hypothesis with those of other models for dynamic recrystallization. We also evaluate the full range of models against experimental data on a variety of materials. We conclude that a temperature dependence of the relationship between recrystallized grain size and flow stress cannot be neglected a priori. This should be taken into account when estimating natural flow stresses using experimentally calibrated recrystallized grain size piezometers. We also demonstrate experimental support for the field boundary hypothesis. This support implies that significant weakening by grain size reduction in localized shear zones is possible only if caused by a process other than dynamic recrystallization (such as syntectonic reaction or cataclasis) or if grain growth is inhibited.

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Calcite textures, microstructures and rheological properties of marble mylonites in the Bancroft shear zone, Ontario, Canada

Cited by 58 publications

References 30 publications

Effects of frictional–viscous oscillations and fluid flow events on the structural evolution and Re–Os pyrite–chalcopyrite systematics of Cu-rich carbonate veins in northern Norway

Effects of frictional–viscous oscillations and fluid flow events on the structural evolution and Re–Os pyrite–chalcopyrite systematics of Cu-rich carbonate veins in northern Norway

Calcite and dolomite in intrusive carbonatites. I. Textural variations

Grain size reduction by dynamic recrystallization: can it result in major rheological weakening?

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