island arc


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Related to island arc: rift valley

island arc

n.
A usually curved chain of volcanic islands occurring on the overriding tectonic plate of a subduction zone, bounded on the convex side by a deep oceanic trench, and formed by magma that rises from the melting of the descending plate.

island arc

n
(Physical Geography) an arc-shaped chain of islands, such as the Aleutian Islands or the Japanese Islands, usually lying at the edge of a Benioff zone, indicating volcanic activity where the oceanic lithosphere is descending into the earth's interior

is·land arc

(ī′lənd)
A usually curved chain of volcanic islands occurring at a subduction zone. The chain occurs in the plate that rides over the subducting plate. It is curved because of the curvature of the Earth.
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Many also take place hidden from view on the sea floor, with some of the most active underwater volcanoes located in the Tonga-Kermadec island arc in the south-west Pacific.
Large-scale island arc volcanic activities happened in intermediate and late Jurassic epoch, which belongs to a set of rock association dominated by andesite.
This study supports the notion that the western Himalayan orogenic belt was shedding largely felsic detritus to Katawaz basin through proto-Indus River, while mafic and ultramafic detritus were being fed by distant Kohistan Island Arc and en-route Waziristan, Zhob and Muslim Bagh Ophiolite and associated melanges.
The largest and southernmost of the Mariana Island Arc, Guam is located east of the Philippines.
uk NT LIVE TREASURE ISLAND Arc, Stockton, 7pm PS12/PS14, details 01642 525199 www.
The best-preserved fragments of an undoubtedly Ordovician island arc which collided with the Siberian craton in Late Ordovician-Early Silurian time are known from the Chingiz-Tarbagatai Range in eastern Kazakhstan.
The volcanic geology of the mid-arc island of Dominica, Lesser Antilles; the surface expression of an island arc batholith.
As a result of this subduction, there exists both intermediate focus earthquakes within the subducted plates and a chain of active volcanoes along the island arc.
Taken together, the evidence suggests that 50 million years ago, India collided with an island arc, pushing it northward.
In all the above-mentioned four sets of new discriminant function based tectonomagmatic diagrams, there is no differentiation between the continental and oceanic arc settings, and the entire arc setting is represented by island arc setting (IAB).
1982: Petrogenesis of the island arc tholeiite series of the South Sandwich Islands.