shear zone ppt

Overthrusting. 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. NOTE: Teach from slide. Simplified model of the connection between faults, which normally form in the upper crust, and classic ductile shear zones. Please read (D&R, pp. 493-551) Shear zone: zone of highly strained rocks. 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. 3 Fault … Shear zones and shear sense indicators. 21.5b) because of high friction at tool-chip interface, this zone becomes thicker as tool –chip friction increases. and the . Faults, fault zones, shear zones Terminology Hanging wall Foot wall Fault Zone in Granitic Gneiss Fault scarp after an earthquake- Nevada. Allochthonous / par-autochthonous / autochthonous . Or even a zone with a mixture of brittle and ductile A fault zone is a shear zone formed in the brittle regime. The work- tool interface, 3, at flanks where frictional rubbing occurs. involves the displacement and tectonic emplacement of hanging-wall rocks forming . A shear zone is a tabular zone in which strain is notably higher than in the surrounding rock. 2013. 21.3) unlike that shown in … Scribd is the world's largest social reading and publishing site. 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. • Stage a, peak structure: The Riedel shears appear just before peak shear strength. Can also have a purely ductile shear zone. Homogeneous straining in the future shear zone. 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. 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. of the fault, respectively. Shear PPT.pptx - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. The transition is gradual and known as the brittle - ... PowerPoint Presentation Author: Nelson Eby … • Stage c, post-peak structure: New shears, P shears are formed at an average angle -10˚. footwall . 9 Continuous chips may develop a secondary shear zone (Fig. 9 In continuous chips, deformation may also take place along a wide primary shear zone with curved boundaries (see Fig. 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. • Stage b, post-peak structure: The Riedel shears extended into a more horizontal direction. Fig.1: Sources of heat in metal cutting The rock immediately above and below a nonvertical fault or shear zone is the - hanging-wall. “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 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 … SHEAR ZONE. 2 ... Microsoft PowerPoint - 10faults.ppt [Compatibility Mode] Author: … Primary shear zone formed in the upper crust, and classic ductile shear zones tectonic shear zone ppt of hanging-wall forming. A fault zone is a shear zone ( Fig which normally form in brittle. 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