Structural discontinuity surface in the Earth's crust and upper mantle
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Pegmatite dyke offset by a steeply dipping dextral shear zone, Cap de CreusExtensional ductile shear zone cutting dolomites of the Noonday Formation in Mosaic Canyon, Death Valley
In geology, a shear zone is a thin zone within the Earth's crust or upper mantle that has been strongly deformed, due to the walls of rock on either side of the zone slipping past each other. In the upper crust, where rock is brittle, the shear zone takes the form of a fracture called a fault. In the lower crust and mantle, the extreme conditions of pressure and temperature make the rock ductile. That is, the rock is capable of slowly deforming without fracture, like hot metal being worked by a blacksmith. Here the shear zone is a wider zone, in which the ductile rock has slowly flowed to accommodate the relative motion of the rock walls on either side.
Because shear zones are found across a wide depth-range, a great variety of different rock types with their characteristic structures are associated with shear zones.
In geology, a shearzone is a thin zone within the Earth's crust or upper mantle that has been strongly deformed, due to the walls of rock on either side...
of a spatially segregated displacement field. The eastern California shearzone is the portion of the Walker Lane that extends south from Owens Valley...
The Central African ShearZone (CASZ) (or Shear System) is a wrench fault system extending in an ENE direction from the Gulf of Guinea through Cameroon...
The Foumban ShearZone, or Central Cameroon ShearZone (CCSZ), is a fault zone in Cameroon that has been correlated with the Pernambuco fault in northeastern...
Dan ShearZone is a north–south trending shearzone in Northeastern Ontario, Canada, located in the municipality of Temagami. The Big Dan ShearZone was...
of Achankovil ShearZone..." ResearchGate. Retrieved 24 October 2021. Praharaj, P.; S, R. (1 December 2018). "The Achankovil ShearZone, Southern India:...
15.66694°S 27.80000°E / -15.66694; 27.80000 The Mwembeshi ShearZone is a ductile shearzone about 550 million years old that extends ENE-WSW across Zambia...
the named shearzones affecting the rocks of Great Britain and the Isle of Man. See the main article on shear for a fuller treatment of shear in rocks...
deformation: the Redbank ShearZone and the Officer Basin. The Redbank ShearZone in the Arunta Block, is a reverse sense shearzone dipping north at about...
Sierra Nevada mountains called the Walker Lane or Eastern California ShearZone. The reason for this is not clear. Several hypotheses have been offered...
Malpica-Lamego line is a shearzone forming a line running north–south on the west side of the Galicia-Trás-os-Montes Zone. It is 275 km long and associated...
called shearzones) in which large deformations are concentrated. Slides are also sub-classified by the form of the surface(s) or shearzone(s) on which...
recent Neoproterozoic sediments. The plate includes shearzones such as the Central African ShearZone (CASZ) where, in the past, two sections of the crust...
(Boiley and Gosselin, 2003) In northern Portugal, along the Vigo–Régua shearzone, the monzogranites belong to the syn-F3 biotite granitoid group. They...
ductilely deformed rocks formed by the accumulation of large shear strain, in ductile fault zones. There are many different views on the formation of mylonites...
east, near the border with Nevada and Arizona, the Eastern California ShearZone (ECSZ) takes up to 25 percent of the plate motion. The ECSZ consists of...
Foumban ShearZone, which was active before and during the opening of the South Atlantic in the Cretaceous period. The western end of the shearzone is obscured...
fractures that are parallel to the major stress orientation, σ1, in a shearzone. They are subsequently filled by precipitation of a mineral, typically...
the Kalaran Orogeny which generated a major fold belt or shearzone, the Fowler ShearZone, ca. 1600–1540 Ma. Economically important deposits found in...
straight coastline or indeed a combination of these features. Fracture zones, shearzones and igneous intrusions such as dykes can also be expressed as geomorphic...
along the shearzone, thereby reducing the barrier for shear band propagation. Timothy, S. P. (1987-02-01). "The structure of adiabatic shear bands in...
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