Results 291 to 300 of about 342,951 (347)
Mechanical analysis and application of floor failure mechanism under repeated mining in close-distance coal seams. [PDF]
Sci RepLi Y, Yao Y, Zhu T, Zeng F, Chang G.
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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
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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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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
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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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Petroleum Geoscience, 2003
In deltaic and turbiditic deposits along passive margins, such as the Lower Congo basin on the West African margin, the main deformation is not induced by a regional tectonic stress field but by the increase of the sedimentary load leading to gravitational instabilities.
I. Moretti +4 more
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In deltaic and turbiditic deposits along passive margins, such as the Lower Congo basin on the West African margin, the main deformation is not induced by a regional tectonic stress field but by the increase of the sedimentary load leading to gravitational instabilities.
I. Moretti +4 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.
Haakon Fossen +1 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.
Haakon Fossen +1 more
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Tectonophysics, 1991
Abstract The geometric character of conjugate ductile shear zones has been defined from the structures developed in a undeformed granitoid corresponding to an homogeneous and isotropic material. In the plane perpendicular to the intersection line of conjugate zones (plane σ 1 σ 3 ) one notes that: (1) the principal direction of finite shortening ...
C. Lamouroux, J. Ingles, P. Debat
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Abstract The geometric character of conjugate ductile shear zones has been defined from the structures developed in a undeformed granitoid corresponding to an homogeneous and isotropic material. In the plane perpendicular to the intersection line of conjugate zones (plane σ 1 σ 3 ) one notes that: (1) the principal direction of finite shortening ...
C. Lamouroux, J. Ingles, P. Debat
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