Results 321 to 330 of about 347,338 (355)
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Physical Review E, 2002
We present some experimental and numerical results based on a simple model designed to give an estimate for the width of a shear zone. We conclude that the observed finite size of the shear zone can be associated with the propagation of the force lines inside the medium.
Hans J. Herrmann +2 more
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We present some experimental and numerical results based on a simple model designed to give an estimate for the width of a shear zone. We conclude that the observed finite size of the shear zone can be associated with the propagation of the force lines inside the medium.
Hans J. Herrmann +2 more
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Earth-Science Reviews, 2017
Strain in the lithosphere localizes into tabular zones known as shear zones that grow from small outcrop-size individual zones to large composite structures. Nucleation is related to distributed microscale flaws or mesoscale structures such as fractures and dikes, and they soon establish displacement profiles similar to faults.
Geane Carolina G. Cavalcante +2 more
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Strain in the lithosphere localizes into tabular zones known as shear zones that grow from small outcrop-size individual zones to large composite structures. Nucleation is related to distributed microscale flaws or mesoscale structures such as fractures and dikes, and they soon establish displacement profiles similar to faults.
Geane Carolina G. Cavalcante +2 more
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Laminar flow in shear zones: the Pernambuco Shear Zone, NE-Brazil
Journal of Structural Geology, 1995Abstract The Pernambuco Shear Zone (PSZ) is a 700 km long branch of one of the largest and best-exposed Precambrian strike-slip shear zone systems in the world. The shear zones are part of the eroded record of a large-scale collision zone. Foliation and lineation orientations along the shear zone indicate that local deformation perturbations have ...
Helton H.F. Torres +4 more
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The South Armorican Shear Zone
Journal of Structural Geology, 1980Abstract The main lithological features and structural relations of the South Armorican Shear Zone (S.A.S.Z.) are described and the evolution of physical conditions during deformation is outlined. Age constraints on the timing of shearing deformation are discussed and an attempt is made to place the S.A.S.Z. in its regional geodynamic context.
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Deformation in a complex crustal-scale shear zone: Errabiddy Shear Zone, Western Australia
Geological Society, London, Special Publications, 2004Abstract Detailed mapping of four areas representing different geological units with varying formation histories within the crustal-scale Errabiddy Shear Zone shows an apparently simple temporal progression from foliation and mineral lineation development to folding and then to brittle deformation across the shear zone. However, in detail the
Occhipinti, Sandra, Reddy, Steven
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Porosity network of a ductile shear zone
Journal of Structural Geology, 1995Abstract The permeability of ductile shear zones is assumed to be significantly higher than that of surrounding undeformed rocks, although lower than that of fracture systems. This assumption, which results indirectly from geochemical mass balance calculations, is checked in this paper by the tomography of the porosity network in a metre-wide ...
Géraud, Yves +2 more
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Large shear zones with no relative displacement
Terra Nova, 2008AbstractIn the Oman ophiolite, the large scale Makhibiyah shear zone, in Wadi Tayin massif was generated with no or little relative motion between the two adjacent blocks, in contrast with what is reported from otherwise similar shear zones in deep crust and upper mantle. This shear zone is asymmetrical with, along one margin an asthenospheric mantle (∼
Nicolas, Adolphe, Boudier, Françoise
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Formation and maintenance of shear zones
Geology, 2006The processes that initiate and maintain prograde ductile shear zones are not well understood. We have performed shear experiments (γ = 1 to 3) on a fine-grained (100– 150 μm) gneiss (59% quartz, 28% plagioclase, 13% aligned but not interconnected biotite) to determine the evolution of deformation mechanisms that produce dramatic strain weakening and ...
Caleb W. Holyoke, Jan Tullis
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Ductile Shearing in Attur Shear Zone and its Relation with Moyar Shear Zone, South India
Gondwana Research, 2000Abstract In the eastern part of southern Peninsular India, the charnockitic hills of the Madras block are cut across by the E-W trending Attur shear zone (ASZ) which is characterised by a thick (1 to 1.5 km) phyllonite zone, showing intense mylonitisation due to ductile shearing.
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On mylonites in ductile shear zones
Journal of Structural Geology, 1980Abstract In this contribution, shear zones are treated as zones of inhomogeneous deformation in which strain softening has occurred. The mylonites which form in ductile shear zones are the softened medium. The development of mylonite microstructures and fabrics are discussed from this point of view.
F.J. Humphreys +4 more
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