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Ductile shearing on top of the Eocene extruding wedge: the Combin Shear Zone
2019A popular model for the exhumation of HP-UHP rocks is the ‘extruding wedge’ model, where a crustal sliceis bounded at its base by a ‘thrust shear-sense’ fault and to the top by a ‘normal shear-sense’ fault. In theWestern Alps, three main ‘normal shear-sense’ shear zones may have bounded extruding wedges at differenttimes during the Alpine orogeny ...
Ballevre, Michel, Manzotti, Paola
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Canadian Journal of Earth Sciences, 1988
In the Fleur de Lys and the Central Gneiss terranes the presence of strain-induced mineral growth characteristic of ductile shear zones within zones of rocks with mylonitic fabrics indicates the existence of major belts of layer-parallel ductile shearing with complex evolutionary sequences.
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In the Fleur de Lys and the Central Gneiss terranes the presence of strain-induced mineral growth characteristic of ductile shear zones within zones of rocks with mylonitic fabrics indicates the existence of major belts of layer-parallel ductile shearing with complex evolutionary sequences.
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Structure and development of an anastomosing network of ductile shear zones
Journal of Structural Geology, 2010A detailed structural analysis of an anastomosing shear zone network in metagabbros from the Archean Rainy Lake zone (Canada) revealed the existence of prevalent dextral and minor sinistral conjugate shear zones with the obtuse angle (>130°) facing the main shortening direction.
Jordi Carreras +3 more
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The Palomares brittle—ductile Shear Zone of southern Spain
Journal of Structural Geology, 1987Abstract The Palomares Shear Zone is a major Neogene-Quaternary strike—slip zone which transects the crust of the Betic Cordillera in SE Spain. The shear zone and the mechanisms that led to its formation are discussed and illustrated on the basis of detailed compilations of both the local and regional geology.
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Ductile shear zones as counterflow boundaries in pseudoplastic fluids
Journal of Structural Geology, 1999Abstract Ductile shear zones with different styles are attributed to rocks having deformed as pseudoplastic power law fluids with different exponents n >1 of the stress sensitivity of the strain rate. Profiles of velocity and accumulated displacements recorded by passive markers in pseudoplastic fluids flowing steadily and continuously along no-slip
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Transcurrent ductile shear zones and the dispersal of the Avalon superterrane
Geological Society, London, Special Publications, 1990Abstract A mosaic of steep, often sinistral, transcurrent shear zones cuts late Precambrian to earliest Cambrian rocks in eastern Canada, southern Britain, and northwest France. Examples include mylonite belts in Saint John (New Brunswick), Cobequid Highlands (Nova Scotia), Burin Peninsula (Newfoundland), Malverns (England), and N Brittany ...
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Ductile shear zones – future perspectives
2020<p>About 50 years ago, John Ramsay and colleagues established the thorough foundation for the field-scale observational and mathematical description of the structures, deformation, and kinematics in ductile shear zones. Since then, these probably most important instabilities of the ductile lithosphere enjoyed an almost explosive ...
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Multidisciplinary characterisation of fluid sources in ductile shear zones
2020Ductile shear zones represent sites of significant fluid circulation and hydrothermal alteration where metamorphic, magmatic and surface-derived fluids meet. Characterization of the meteoric source of crustal fluids can be used to better understand ore deposition and mineralization at the orogen scale or for stable isotope paleoaltimetry ...
Dusséaux, Camille +10 more
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Anisotropic connectivity of the porous network in a ductile shear zone
1998Porosity and connectivity of the porous network of a sheared granite in green schist facies, are showed by a capillary test under CT X-ray. A strong correlation is pointed out between mineral phases, strain (dissolution - crystallization, shearing), porosity and connectivity of the network.
Géraud, Yves +4 more
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