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Ductile Shear Zones

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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Ductile shear zones

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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Finite width of shear zones

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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Laminar flow in shear zones: the Pernambuco Shear Zone, NE-Brazil

Journal of Structural Geology, 1995
Abstract 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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Timing of shear deformation in the Singhbhum Shear Zone, India: implications for shear zone-hosted polymetallic mineralization

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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