Articles | Volume 9, issue 6
https://doi.org/10.5194/se-9-1399-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-9-1399-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
10 Dec 2018
Research article |
| 10 Dec 2018
| 10 Dec 2018
Myrmekite and strain weakening in granitoid mylonites
Alberto Ceccato
CORRESPONDING AUTHOR
Department of Geosciences, University of Padova, 35131 Padova, Italy
now at: School of Geography, Earth and Environmental Sciences,
University of Plymouth, PL48AA Plymouth, UK
Luca Menegon
School of Geography, Earth and Environmental Sciences, University of Plymouth,
PL48AA Plymouth, UK
Giorgio Pennacchioni
Department of Geosciences, University of Padova, 35131 Padova, Italy
Luiz Fernando Grafulha Morales
Scientific Centre for Optical and Electron Microscopy
(ScopeM) – ETH Zürich, Zurich,
Switzerland
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28 citations as recorded by crossref.
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- Dominant slip systems of quartz under lower amphibolite-facies conditions identified from microstructures and CPOs in quartz phenocrysts Q. Wang et al. 10.1016/j.jsg.2024.105106
- Effect of Low Viscosity Contrast between Quartz and Plagioclase on Creep Behavior of the Mid-Crustal Shear Zone H. Endo et al. 10.3390/min14030229
- Fracturing, comminution and grain-size-sensitive creep as a record of coseismic loading in the middle-crust: Insights from the Urtiga mylonitic pluton (NE Brazil) G. Viegas et al. 10.1016/j.jsg.2024.105237
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- Fluid-enhanced grain-size reduction of K-feldspar from a natural middle crustal shear zone in northern Beijing, China B. Zhou et al. 10.1016/j.tecto.2022.229478
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- Evidence of fluid-induced myrmekite formation after alkali-feldspar megacrysts: an example from a meta-porphyritic granitoid in Makrohar, Madhya Pradesh, India A. Chakrabarty et al. 10.1180/mgm.2023.90
- Fluid-mediated, brittle–ductile deformation at seismogenic depth – Part 2: Stress history and fluid pressure variations in a shear zone in a nuclear waste repository (Olkiluoto Island, Finland) F. Prando et al. 10.5194/se-11-489-2020
- Exhumation of the Coyote Mountains Metamorphic Core Complex (Arizona): Implications for Orogenic Collapse of the Southern North American Cordillera R. Gottardi et al. 10.1029/2019TC006050
- Strain Localized Deformation Variation of a Small-Scale Ductile Shear Zone L. Zhan et al. 10.1007/s12583-022-1681-6
- Role of myrmekite and associated deformation fabrics in controlling development of granitic mylonites in the Pofadder Shear Zone of southern Namibia D. Cisneros-Lazaro et al. 10.1007/s00410-019-1555-9
- Provenance of far-traveled nappes in the eastern Mediterranean (Uppermost Unit, Crete): constraints from U–Pb zircon ages of detrital and igneous zircons G. Zulauf et al. 10.1007/s00531-023-02356-9
26 citations as recorded by crossref.
- Feldspar microboudinage paleopiezometer and its applications to estimating differential stress magnitudes in the continental middle crust (examples from west Yunnan, China) S. Ji & L. Li 10.1016/j.tecto.2021.228778
- Dynamic Recrystallization Can Produce Porosity in Shear Zones J. Gilgannon et al. 10.1029/2019GL086172
- Protracted localization of metamorphism and deformation in a heterogeneous lower-crustal shear zone S. Zertani et al. 10.1016/j.jsg.2023.104960
- Thermal and Physical Properties of Deccan Basalt and Neoarchean Basement Cores From a Deep Scientific Borehole in the Koyna−Warna Seismogenic Region, Deccan Volcanic Province, Western India: Implications on Thermal Modeling and Seismogenesis L. Ray et al. 10.1029/2021EA001645
- Tonian evolution of an active continental margin - a model for Neoproterozoic NW India-SE Pakistan–E Oman linkage H. de Wall et al. 10.1016/j.precamres.2022.106822
- Microstructure of minerals investigation and the emplacement pattern of Garagheh granitoid pluton using Anisotropy of Magnetic Susceptibility (AMS) N. Sarhadi et al. 10.61186/ijcm.32.3.395
- Weaker Than Weakest: On the Strength of Shear Zones C. Stenvall et al. 10.1029/2019GL083388
- Rheological bridge zones: the initiation of strain localization H. Feng et al. 10.1139/cjes-2023-0132
- Dominant slip systems of quartz under lower amphibolite-facies conditions identified from microstructures and CPOs in quartz phenocrysts Q. Wang et al. 10.1016/j.jsg.2024.105106
- Effect of Low Viscosity Contrast between Quartz and Plagioclase on Creep Behavior of the Mid-Crustal Shear Zone H. Endo et al. 10.3390/min14030229
- Fracturing, comminution and grain-size-sensitive creep as a record of coseismic loading in the middle-crust: Insights from the Urtiga mylonitic pluton (NE Brazil) G. Viegas et al. 10.1016/j.jsg.2024.105237
- Crystallographic orientation relationships between quartz and feldspar in myrmekite: a case study in monzodiorite from Meichuan pluton, China Y. Song et al. 10.1180/mgm.2021.39
- Protracted Shearing at Midcrustal Conditions During Large‐Scale Thrusting in the Scandinavian Caledonides F. Giuntoli et al. 10.1029/2020TC006267
- Superplastic deformation inside the knife-sharp shear bands in mid-crustal granites A. Sikdar et al. 10.1016/j.jsg.2023.104980
- Omphacite breakdown: nucleation and deformation of clinopyroxene-plagioclase symplectites S. Zertani et al. 10.1007/s00410-024-02125-0
- Development of a synorogenic composite sill at deep structural levels of a magmatic arc (Odenwald, Germany). Part 2: Rheological inversion and mullion formation under bulk constriction G. Zulauf et al. 10.1016/j.jsg.2022.104525
- Temperature, fluid content and rheology of localized ductile shear zones in subsolidus cooling plutons A. Ceccato et al. 10.1111/jmg.12553
- Fluid-enhanced grain-size reduction of K-feldspar from a natural middle crustal shear zone in northern Beijing, China B. Zhou et al. 10.1016/j.tecto.2022.229478
- Petrology and U–Pb zircon age of the Variscan porphyroclastic Rand Granite at the southeastern margin of the Central Schwarzwald Gneiss Complex (Germany) R. Altherr et al. 10.1007/s00531-019-01738-2
- Constraining kinematic and temporal evolution of a normal-sense shear zone: Insights into the Simplon Shear Zone (Western Alps) C. Montemagni & S. Zanchetta 10.1016/j.jsg.2022.104557
- On the petrology and microstructures of small-scale ductile shear zones in granitoid rocks: An overview A. Ceccato et al. 10.1016/j.jsg.2022.104667
- Thermobarometric and structural constraints on multistage emplacement mechanism of the Garagheh pluton, Sistan Suture Zone (SE Iran) N. Sarhadi et al. 10.1016/j.jseaes.2023.105624
- Evidence of fluid-induced myrmekite formation after alkali-feldspar megacrysts: an example from a meta-porphyritic granitoid in Makrohar, Madhya Pradesh, India A. Chakrabarty et al. 10.1180/mgm.2023.90
- Fluid-mediated, brittle–ductile deformation at seismogenic depth – Part 2: Stress history and fluid pressure variations in a shear zone in a nuclear waste repository (Olkiluoto Island, Finland) F. Prando et al. 10.5194/se-11-489-2020
- Exhumation of the Coyote Mountains Metamorphic Core Complex (Arizona): Implications for Orogenic Collapse of the Southern North American Cordillera R. Gottardi et al. 10.1029/2019TC006050
- Strain Localized Deformation Variation of a Small-Scale Ductile Shear Zone L. Zhan et al. 10.1007/s12583-022-1681-6
2 citations as recorded by crossref.
- Role of myrmekite and associated deformation fabrics in controlling development of granitic mylonites in the Pofadder Shear Zone of southern Namibia D. Cisneros-Lazaro et al. 10.1007/s00410-019-1555-9
- Provenance of far-traveled nappes in the eastern Mediterranean (Uppermost Unit, Crete): constraints from U–Pb zircon ages of detrital and igneous zircons G. Zulauf et al. 10.1007/s00531-023-02356-9
Discussed (final revised paper)
Discussed (preprint)
Latest update: 23 Nov 2024
Short summary
Metamorphic fine-grained reaction products make continental crust rocks weaker. Microstructural processes related to the transformation of strong K-feldspar into weak aggregates of plagioclase and quartz during crustal deformation have been investigated through electron microscopy. Rheological calculations show that the occurrence of even small amounts of weak aggregates, whose deformation is mainly diffusion-assisted, would lead to a decrease in rock viscosity of several orders of magnitude.
Metamorphic fine-grained reaction products make continental crust rocks weaker. Microstructural...
