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A region where this process occurs is known as a subduction zone, and its surface expression is known as an arc-trench complex. The process of subduction has created most of the Earth's continental crust. [1] Rates of subduction are typically measured in centimeters per year, with rates of convergence as high as 11 cm/year. [2]
Obduction zones occurs when the continental plate is pushed under the oceanic plate, but this is unusual as the relative densities of the tectonic plates favours subduction of the oceanic plate. This causes the oceanic plate to buckle and usually results in a new mid-ocean ridge forming and turning the obduction into subduction. [citation needed]
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Subduction zones host a unique variety of rock types formed by the high-pressure, low-temperature conditions a subducting slab encounters during its descent. [4] The metamorphic conditions the slab passes through in this process generates and alters water bearing (hydrous) mineral phases, releasing water into the mantle.
The northern subduction zone is located where the Solomon plate is diving below the South Bismarck plate to the northwest and the Pacific plate to the northeast at the New Britain Trench. This is area is extremely active seismologically. [5] [6] The northwest part of the subduction zone is called the New Britain Subduction Zone.
Subduction zone (continental collision) Active: 1505 Lo Mustang (M8.9), 1950 Assam-Tibet (M8.6) 2015 Gorkha (M7.8), 2015 Nepal (M7.3) Main Uralian Fault (MUF) 2000+ Urals: Subduction zone: Marianna Fault: Arkansas, United States: Marikina Valley fault system: Philippines: Dextral strike-slip: Active: Marlborough fault system: South Island, New ...
The Hellenic subduction zone (HSZ) is the convergent boundary between the African plate and the Aegean Sea plate, where oceanic crust of the African is being subducted north–northeastwards beneath the Aegean.
The figure is a schematic diagram depicting a subduction zone. The subduction slab on the right enters the mantle with a varying temperature gradient while importing water in a downward motion. A model of the subducting Farallon slab under North America. In geology, the slab is a significant constituent of subduction zones. [1]