Results 211 to 220 of about 52,091 (262)
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2015
Mylonite with a big delta mantled porphyroclast of K-feldspar in a matrix of quartz, mica and feldspar. Mylonite is derived from a porphyritic granite characterized by large K-feldspar phenocrysts (up to 20 cm long). Medium-grade conditions can be inferred from the recrystallization of K-feldspar along the rims of porphyroclast.
Induni, Guillermo Alvarado +9 more
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Mylonite with a big delta mantled porphyroclast of K-feldspar in a matrix of quartz, mica and feldspar. Mylonite is derived from a porphyritic granite characterized by large K-feldspar phenocrysts (up to 20 cm long). Medium-grade conditions can be inferred from the recrystallization of K-feldspar along the rims of porphyroclast.
Induni, Guillermo Alvarado +9 more
+7 more sources
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.
Haakon Fossen +1 more
exaly +2 more sources
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.
Haakon Fossen +1 more
exaly +2 more sources
2021
Tabular or sheetlike and planar or curviplanar zones in which rocks are more highly strained than rocks adjacent to the zone are called ductile shear zones. The identification and study of ductile shear zones (Figures 2.1–2.73) are important, because such shear zones define major plate boundaries.
Pamplona, J., Rodrigues, B. C.
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Tabular or sheetlike and planar or curviplanar zones in which rocks are more highly strained than rocks adjacent to the zone are called ductile shear zones. The identification and study of ductile shear zones (Figures 2.1–2.73) are important, because such shear zones define major plate boundaries.
Pamplona, J., Rodrigues, B. C.
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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.
Bertrand, Francois +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.
Bertrand, Francois +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 ...
Ian Davison +4 more
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Journal of Geophysical Research: Oceans, 1978
At Geochemical Ocean Sections Study station 28, in the basin east of the Newfoundland Ridge, dramatic evidence for the ‘underthrusting’ of the benthic boundary layer was encountered. Results from the continuous temperature, salinity, and nephel measurements and from discrete water samples are presented in order to document that strong shearing within ...
Wallace S. Broecker, Arnold Bainbridge
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At Geochemical Ocean Sections Study station 28, in the basin east of the Newfoundland Ridge, dramatic evidence for the ‘underthrusting’ of the benthic boundary layer was encountered. Results from the continuous temperature, salinity, and nephel measurements and from discrete water samples are presented in order to document that strong shearing within ...
Wallace S. Broecker, Arnold Bainbridge
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Geological Magazine, 2022
AbstractThe Singhbhum Shear Zone in eastern India hosts several Fe oxide–Cu–Au (IOCG)-type polymetallic deposits, mined primarily for U, Cu and apatite, with elevated concentrations of rare earth elements, Ni, Co, Mo, Te and Au in association with low-Ti magnetite. Although the main stages of hydrothermal U, Cu and rare earth element mineralization are
Dipak C Pal +2 more
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AbstractThe Singhbhum Shear Zone in eastern India hosts several Fe oxide–Cu–Au (IOCG)-type polymetallic deposits, mined primarily for U, Cu and apatite, with elevated concentrations of rare earth elements, Ni, Co, Mo, Te and Au in association with low-Ti magnetite. Although the main stages of hydrothermal U, Cu and rare earth element mineralization are
Dipak C Pal +2 more
openaire +1 more source
Géotechnique, 2008
The behaviour of landslides in clay is essentially governed by a shear zone located at the base of the soil mass. While some data regarding the shear zones of slides are available, information is rather poor about the shear zones of mudslides. The paper reports some results of investigations on the shear zone located at the base of a mudslide, showing
COMEGNA, Luca, PICARELLI, Luciano
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The behaviour of landslides in clay is essentially governed by a shear zone located at the base of the soil mass. While some data regarding the shear zones of slides are available, information is rather poor about the shear zones of mudslides. The paper reports some results of investigations on the shear zone located at the base of a mudslide, showing
COMEGNA, Luca, PICARELLI, Luciano
openaire +2 more sources
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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Restraining bends in high temperature shear zones: The “Central Cameroon Shear Zone”, Central Africa
Journal of African Earth Sciences, 2008Abstract A detailed structural study of the Central Cameroon Shear Zone (CCSZ) segment, in the Bamoun plateau (BP) and the Tikar plain (TP) (West Cameroon), reveals a complex strain geometry of this shear zone. It shows thick mylonite bands wrapping around lenses of various country rock types, at small, medium and large scales. The mylonite foliation
Hervé DIOT +2 more
exaly +3 more sources