The standard type of folding in deformation zones undergoing transpression is the average fold system. A definition of the concept of shear zones opens the article, followed by the shear zones classification into three types, namely brittle (e.g., Fig. 2a). Wind shear, rapid change in wind velocity or direction. ECSZ is defined as Eastern California Shear Zone somewhat frequently. Fenelon Gold System, Tabasco/Cayenne Zone Definition Drilling . Define Shear zone. How to use shear in a sentence. Definition drilling to a 50-60 metre nominal spacing continues to outline the high metal factor core of the Tabasco-Cayenne shear system, which forms part of the larger shear corridor and has thus far been drilled over a strike length of 800 metres to a vertical depth of 1,000 metres. All Free. Two shear zones at micro-and mapscale. 1b), and ductile. From Ramsay, 1980. Originally it was thought that this occurred through brittle grinding (the word mylonite refers to milling of flour). Transpression is a three-dimensional (3D) kinematic model often used to describe the flow of material at the plate tectonic scale (e.g., Sanderson and Marchini, 1984). ECSZ stands for Eastern California Shear Zone. Synonym of: sheeted zone, sheeted-zone deposit Ref: AGI ii. i. Such an area is often mineralized by ore-forming solutions. Definition of shear zone. There are two end-members. Hogback. The SEMSZ acronym/abbreviation definition. The hypothetical shear zone is oriented roughly NE-SW, meaning that any faults present in the zone should have roughly the same orientation. Menu Search. 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 . See more. click for more detailed Chinese translation, definition, pronunciation and example sentences. 1, Fig. Printer friendly. With Reverso you can find the English translation, definition or synonym for shear zone and thousands of other words. Shear zones involve volumes of rock deformed by shearing stress under brittle-ductile or ductile conditions, typically in subduction zones at depths down to 10-20 km. Continental-scale shear zones play an important role in accommodating block extrusion and rotation as shown by deformation on the Ailaoshan-Red River shear zone (ASRRSZ) in the SE Tibetan Plateau. A very narrow zone of abrupt velocity change is known as a shear line. shear zone - WordReference English dictionary, questions, discussion and forums. shear zone landslide in Chinese : 破碎带滑坡…. Strain is considerably higher in shear zones with respect to the surrounding rocks, which may appear weakly deformed or non-deformed at all. Find. means a zone in which rocks have been deformed by lateral movement along parallel planes Shear definition, to cut (something). The geometry and displacement boundary conditions of these zones are established. shear zone A region, narrow compared to its length, within which rocks have undergone intense deformation. A tabular zone of rock that has been crushed and brecciated by many parallel fractures due to shear strain. Source for information on shear zone: A Dictionary of Earth Sciences dictionary. New search features Acronym Blog Free tools "AcronymFinder.com . Shear zone definition is - a zone of shear structure or of closely spaced approximately parallel faults that often becomes a channel for underground solutions and the seat of ore deposition. fault zone(shear zone) in Chinese : 断层带…. Definition and classification. Vertical wind shear that causes turbulence is closely Many zones of en echelon folds are associated with faults and are probably best classified as semibrittle shear zones. Ref: Zern. Printer friendly. Shear zones may form zones of much more intense foliation, deformation, and folding. Shear zones may be classified into Brittle-, Brittle-ductile, and Ductile-shear zones. A shear zone is the ductile, deep equivalent of a fault zone. 1a), brittle-ductile (e.g., Fig. The definition of SEMSZ by AcronymAndSlang.com Shear zones - especially in the shield - are the locus of large amounts of mineralization, eg Hemlo Gold deposit. Abbreviation to define. The Øksfjord shear zone (ØSZ) is one of several paragneiss shear zones present within gabbros of the Seiland Igneous Province, formed by syn-intrusive deep crustal shearing during lithospheric extension related to continental rifting. Find. Microstructures from the ØSZ show evidence for different deformation conditions. Learn more. Atlas » Learn more about the world with our collection of regional and country maps. Shear zones are one type of strain localization structures [], which are widely developed in various structural environments.As weak zones in regions, shear zones are always concentrated for intense magma activities, fluid actions and metamorphism, hence provide favorable transport channels and precipitation spaces for ore-forming elements, e.g., Au, Ag, Cu, Pb, Zn, W, Sn and Mo [2,3,4,5,6,7]. Typically this is a type of fault, but it may be difficult to place a distinct fault plane into the shear zone.Shear zones may form zones of much more intense foliation, deformation, and folding. GRSZ is defined as George River Shear Zone (geology) very rarely. A shear zone is a tabular to sheetlike, planar or curviplanar zone composed of rocks that are more highly strained than rocks adjacent to the zone. How is George River Shear Zone (geology) abbreviated? Brittle shear zones (faults), marked by a surface of rupture, are a common feature of higher crustal levels. Examples of how to use “shear zone” in a sentence from the Cambridge Dictionary Labs Mean vorticity (W m) is a common measure of vorticity used in the structural geology community and it varies from zero (100% pure shear) to one (100% simple shear; e.g., Xypolias, 2010). New search features Acronym Blog Free tools "AcronymFinder.com. Hop on to get the meaning of SEMSZ acronym / slang / Abbreviation. Focal mechanisms calculated for the mainshock suggest the earthquake accomodated mostly strike-slip motion on either a left-lateral NE-SW or right-lateral NW-SE oriented fault, according to multiple seismic agencies. Characterized by extreme grain-size reduction. Figure 1 – a) Conjugate brittle shear zones; (b) En échelon brittle-ductile shear zone: quartz filled vein fissures in a sandstone. Observations made during this study indicate that forcible intrusion is unlikely and the mylonites are a result of late synkinematic or post emplacement deformation. Click here to see list of references, authorities, sources and geographical terms as used in this glossary. A characteristic rock type:- mylonite. Shear zones are generally wider than faults and may accommodate displacements over a range of scales from some centimeters to tens of kilometers. Wind shear is observed both near the ground and in jet streams, where it may be associated with clear-air turbulence. Typically this is a type of fault but it may be difficult to place a distinct fault plane into the shear zone. shear-zone: A belt of rock crushed and metamorphosed by compression. GRSZ stands for George River Shear Zone (geology). Table of Contents: Page ABSTRACT..... iii. Folds tend to form sigmoidal patterns in rocks of a low metamorphic grade within heterogeneous shear zones. shear definition: 1. to cut the wool off a sheep: 2. to cut the hair on a person's head close to the skin…. The Undefined Acronym / Slang SEMSZ means... AcronymsAndSlang. Shear zones defined by en echelon folds can be either semibrittle or ductile, depending of the conditions under which they form. click for more detailed Chinese translation, definition, pronunciation and example sentences. radial shear zone in Chinese : 辐射状剪力区…. A shear zone is a zone in which strain is clearly higher than in the wall rock, and whose margins are defined by a change in strain, typically seen by rotation of preexisting markers or formation of a new fabric (Fig. a) Shear band in highly porous sandstone (thin section of core from the Njord Field, offshore central Norway). Abbreviation to define. The SEMSZ meaning is Southern Edgar Marginal Shear Zone. Fenelon Gold System, Tabasco/Cayenne Zone Definition Drilling. A shear zone is a tabular to sheetlike, planar or curviplanar zone composed of rocks that are more highly strained than rocks adjacent to the zone. 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