Plastic anisotropy and fabric evolution in sheared and recrystallized quartz single crystals

Muto, Jun; Hirth, Greg; Heilbronner, Renée; Tullis, Jan

doi:10.1029/2010jb007891

Cited by 58 publications

(58 citation statements)

References 47 publications

(68 reference statements)

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“…Y-max textures, related to the activity of prism <a> slip, are consistent with upper greenschist-lower amphibolite facies deformation, assuming normal geologic strain rates and water content (e.g., Schmid & Casey, 1986). In this domain large relic grains were compliant during deformation developing a high aspect ratio and a preferred orientation parallel to the foliation, as it is expected for grains with c axis parallel to Y under conditions of dominant prism <a> slip (e.g., Ceccato et al, 2017;Muto et al, 2011). Two major mechanisms are believed to have controlled the development of such diverse microstructures: (1) grain-scale strain partitioning leading to a completely different microfabric evolution within the different domains and (2) fluid ingress and fluid-rock interaction, as documented by the abundant pitted grain boundaries, trails of fluid inclusions, and secondary phases trapped in quartz ( Figure 5; e.g., Drury & Urai, 1990;Mancktelow et al, 1998;Mancktelow & Pennacchioni, 2004).…”

Section: Grain-scale Strain Partitioning In the Different Domainssupporting

confidence: 63%

“…A classic example is represented by sheared quartz-feldspar aggregates at midcrustal conditions, where quartz typically recrystallizes and feldspar forms fractured porphyroclasts (Tullis et al, 1990(Tullis et al, , 2000Vernon & Flood, 1988). However, many studies, focused on quartz monomineralic aggregates, highlighted the complex role played by grain-scale strain partitioning in assisting semibrittle deformation in quartz (van Daalen et al, 1999;Muto et al, 2011;. However, many studies, focused on quartz monomineralic aggregates, highlighted the complex role played by grain-scale strain partitioning in assisting semibrittle deformation in quartz (van Daalen et al, 1999;Muto et al, 2011;.…”

Section: Introductionmentioning

confidence: 99%

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Fluid‐Assisted Strain Localization in Quartz at the Brittle/Ductile Transition

Papeschi

Musumeci

2019

Geochem Geophys Geosyst

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A mylonitic quartzite with conjugate and synthetic shear bands was investigated by Electron Backscatter Diffraction and optical microscopy to obtain insights on recrystallization mechanisms and strain localization in quartz at plastic to semibrittle conditions close to the brittle‐ductile transition. The mylonitic quartzite deformed during late Miocene thrusting coeval with contact metamorphism in the high‐strain domains of the Calamita Schists (Elba Island, Italy). Mylonitic deformation occurred from amphibolite to lower greenschist facies conditions during cooling of the aureole. Dynamic recrystallization, dominated by the activity of dislocation creep by prism slip, produced recrystallized quartz layers mantling relic large quartz porphyroclasts. Under decreasing temperature and fluid‐rich conditions, quartz porphyroclasts acted as relatively rigid bodies and fractured along synthetic and conjugate C′ shear bands. Shear bands developed along kinematically favored orientations, just locally assisted by weak crystallographic planes in quartz. Fracturing along shear bands was assisted by cataclasis and fluid infiltration enhancing fracture propagation and healing by recrystallization and authigenesis of new quartz and phyllosilicate grains. The process enhanced the propagation of and strain localization in shear bands, with the development of bands of weak phyllosilicates. Furthermore, we observed the development of a c axis preferred orientation (CPO) related to dissolution and precipitation of new grains with their c axis oriented parallel to shear bands. This study highlights the importance of the interplay between brittle and crystal‐plastic processes and fluid ingress in the semibrittle regime to understand deformation partitioning and strain localization.

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Section: Grain-scale Strain Partitioning In the Different Domainssupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Fluid‐Assisted Strain Localization in Quartz at the Brittle/Ductile Transition

Papeschi

Musumeci

2019

Geochem Geophys Geosyst

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“…Similar recrystallized quartz fabrics have been reported in previous experiments on quartz deformed to comparable strains, both in quartzites [ Tullis et al ., ; Stipp et al ., ; Heilbronner and Tullis , ] and quartz single crystals [ Vernooij et al ., ; Muto et al ., ]. The rapid evolution with increasing strain to the strong Y axis maximum (Figure d) has been interpreted to result from GBM recrystallization [ Heilbronner and Tullis , ; Muto et al ., ]. The uncontoured pole figure diagram from the highest‐strain experiment reveals a faint cross girdle of c axis orientations indicative of minor slip on the rhomb and basal planes (Figure d).…”

Section: Resultsmentioning

confidence: 97%

Experimental constraints on the role of dynamic recrystallization on resetting the Ti‐in‐quartz thermobarometer

Nachlas

Hirth

2015

JGR Solid Earth

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We conducted deformation experiments on Ti‐doped quartz aggregates to investigate the effect of crystal‐plastic deformation and dynamic recrystallization on Ti substitution in quartz. Shear experiments were conducted at 1.0 GPa and 900°C at a constant shear strain rate (~5 × 10−6 s−1) for progressively longer intervals of time (24, 48, and 72 h). Equivalent experiments were conducted under hydrostatic stress to compare the effect of deformation relative to static crystallization. A novel quartz‐doping technique is used to synthesize a quartz aggregate consisting of two layers with Ti concentrations above and below the predicted solubility level for the experimental conditions. Samples deformed to progressively higher shear strain by dislocation creep accommodated by a combination of subgrain rotation and grain boundary migration recrystallization show a strengthening of the crystallographic preferred orientation that correlates with a progressive evolution of Ti concentrations. Quartz grains in the highest strain, most strongly recrystallized samples have Ti concentrations that are most similar to undeformed quartz grown in hydrostatic annealing experiments. Cathodoluminescence (CL) analysis of intragrain variations in Ti content reveals core and rim zoning present in the starting material that becomes progressively homogenized with increasing strain—recrystallized quartz in the highest‐strain samples exhibits a uniform CL signal. We conclude that dynamic recrystallization enhances the kinetics of trace element equilibration in quartz, illustrating that Ti‐in‐quartz thermobarometry is capable of recording the conditions of ductile shearing.

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“…GBM could explain the strongly serrated form and complex 3D intergrowth of crystals. In addition, recent experiments by Muto et al [2009], made under conditions in which recrystallization occurs by subgrain rotation and rapid grain boundary migration, have shown that GBM can completely change an initial CPO. However, support for this interpretation is not very convincing for the following reasons: (i) many WDV do not contain a population of grains well oriented for prism hai slip that could grow at the expense of the dominant population of poorly oriented crystals, (ii) the strain window for complete CPO replacement seems too small (g < 1), and (iii) the CPO of WDV with a strong peripheral maximum close to the X axis is present in veins that do not show pervasive GBM microstructures (Figure 1a).…”

Section: The Cpo Evolution Of the Adamello Quartz Veinsmentioning

confidence: 99%

Development of crystallographic preferred orientation and microstructure during plastic deformation of natural coarse‐grained quartz veins

Pennacchioni

Menegon

Leiss³

et al. 2010

J. Geophys. Res.

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[1] The microstructure and crystallographic preferred orientation (CPO) of quartz were quantified in 17 samples of natural monomineralic tabular veins. The veins opened and were deformed, up to shear strain g > 15, in a small temperature window (about 25°C) above 500°C, as established by Ti-in-quartz thermometry. The veins filled a set of fractures within the Adamello tonalite (southern Alps, Italy) and localized homogeneous simple shear during postmagmatic cooling. The local (square millimeter scale) and bulk (square centimeter) CPO were investigated by computer-integrated polarization microscopy (CIP) and X-ray texture goniometry. Weakly deformed veins (WDV: g < 1) consist of millimeter-to centimeter-sized crystals with a strong CPO showing a c-axis girdle slightly inclined, mostly with the shear sense, to the foliation (XY) plane and a strong maximum close to the lineation (X). Moderately deformed veins (MDV: 2 < g < 3) consist of elongated nonrecrystallized ribbon grains and most have a CPO showing a strong Y maximum of c axes some with weak extension into a YZ girdle. Strongly deformed veins (SDV: g = 4 to 15) are pervasively to completely recrystallized to fine (34-40 mm grain size) aggregates with a strong CPO similar to that of MDV. The slip systems during plastic deformation were dominantly prism hai with subordinate rhomb and basal hai slip. Recrystallization occurred rather abruptly for 3 < g < 4. In contrast to dislocation creep experiments in quartz (and other minerals), a steady-state recrystallized fabric is achieved at early stages of deformation (g ≈ 4) as there is no evidence, with increasing strain, of strengthening of the CPO, of rotation of the fabric skeleton, or of change in grain size. WDV represent weakly deformed relicts of veins with an initial CPO believed to have developed during crystal growth but unsuitably oriented for prism hai slip during subsequent shear. MDV and SDV appear to derive from veins different from WDV, where the vein crystals grew with orientation favorable for prism hai slip. The relationship between the initial growth CPO and the kinematic framework suggests that veins opened at a temperature close to that at which there is a switch between the activity of prism hci and prism hai slip, with the temperature of growth causing growth of crystals well oriented for slip. The initial CPO of veins, from which quartz mylonites are commonly derived, plays a critical role in the fabric evolution. The strong growth-and strain-induced CPOs of these sheared veins inhibited significant reworking during lower temperature stages of pluton cooling when basal hai slip would have been dominant.

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Plastic anisotropy and fabric evolution in sheared and recrystallized quartz single crystals

Cited by 58 publications

References 47 publications

Fluid‐Assisted Strain Localization in Quartz at the Brittle/Ductile Transition

Fluid‐Assisted Strain Localization in Quartz at the Brittle/Ductile Transition

Experimental constraints on the role of dynamic recrystallization on resetting the Ti‐in‐quartz thermobarometer

Development of crystallographic preferred orientation and microstructure during plastic deformation of natural coarse‐grained quartz veins

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