21.3) unlike that shown in … Scribd is the world's largest social reading and publishing site. Can also have a purely ductile shear zone. … 9 Continuous chips may develop a secondary shear zone (Fig. A fault zone is a shear zone formed in the brittle regime. • Stage a, peak structure: The Riedel shears appear just before peak shear strength. 9 In continuous chips, deformation may also take place along a wide primary shear zone with curved boundaries (see Fig. • Stage b, post-peak structure: The Riedel shears extended into a more horizontal direction. Shear zones form a continuum of geological structures, ranging from brittle shear zones (or faults) via brittle–ductile shear zones (or semibrittle shear zones), ductile–brittle to ductile shear … A shear zone is a zone of strong deformation (with a high strain rate) surrounded by rocks with a lower state of finite strain.It is characterised by a length to width ratio of more than 5:1. Fig.1: Sources of heat in metal cutting Allochthonous / par-autochthonous / autochthonous . Overthrusting. The rock immediately above and below a nonvertical fault or shear zone is the - hanging-wall. footwall . of the fault, respectively. 3 Fault … • Stage c, post-peak structure: New shears, P shears are formed at an average angle -10˚. The shear zone, 1,where the primary plastic or shear deformation takes place The chip-tool interface, 2, where secondary plastic deformation due to friction between the heated chip and tool takes place. NOTE: Teach from slide. shear zone; (b) Secondary shear zone at the chip-tool interface; (c) Continuous chip with built-up edge (d) Continuous chip with large primary shear zone (e) Segmented or nonhomogeneous chip and (f) Discontinuous chip. Or even a zone with a mixture of brittle and ductile Shear PPT.pptx - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Simplified model of the connection between faults, which normally form in the upper crust, and classic ductile shear zones. The transition is gradual and known as the brittle - ... PowerPoint Presentation Author: Nelson Eby … Faults, fault zones, shear zones Terminology Hanging wall Foot wall Fault Zone in Granitic Gneiss Fault scarp after an earthquake- Nevada. A shear zone is a tabular zone in which strain is notably higher than in the surrounding rock. Please read (D&R, pp. Adverse Winds Wind shear – The rate of change of wind velocity (direction and/or speed) per unit distance; conventionally expressed as vertical or horizontal wind shear. SHEAR ZONE. 2 Plate Boundary-San Andreas Fault Fault Fence Fault zone in Quartzites-Brooks Range Small Normal Faults Small Thrust Fault – Moss Beach, Ca Types of fault Oblique slip. 2013. Fault Zone Shear Zone Fault zone geometry depends on mechanical stratigraphy (Richard et al., 2013) Fault Wide fault zone Shear zone Vertical Fault Discontinuity Role of Mechanical Stratigraphy Richard et al. 21.5b) because of high friction at tool-chip interface, this zone becomes thicker as tool –chip friction increases. and the . Homogeneous straining in the future shear zone. “Inyoni shear zone” Inyoni shear zone 3 Ep + 7 Qz + 9 Amp1 = 7 Gt + (10 Ab + 1 Or) + 4 Cpx + 3 Amp2 23 Gt + 16 Cpx + 6 An = 17 Ep + 9 Amp3 + 5 Qz “Inyoni shear zone” Inyoni shear zone 3 Ep + 7 Qz + 9 Amp1 = 7 Gt + (10 Ab + 1 Or) + 4 Cpx + 3 Amp2 23 Gt + 16 Cpx + 6 An = 17 Ep + 9 Amp3 + 5 Qz Percival, 1994 … Shear zones and shear sense indicators. involves the displacement and tectonic emplacement of hanging-wall rocks forming . 493-551) Shear zone: zone of highly strained rocks. The work- tool interface, 3, at flanks where frictional rubbing occurs. 2 ... 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