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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Cassini considers that the geological setting may have some affinity with intracontinental 'hot-spot' epithermal gold mineralisation, rather than the more common island arc setting found elsewhere along the Pacific Rim.
The Kermadec Islands are a subtropical island arc in the South Pacific Ocean.
The Chilas Complex is a ~40 wide and 300 long composite plutonic body exposed in the central part of Kohistan island arc, which formed first as intra-oceanic island arc in the Neo-tethyan oceanic crust and later transformed into Andean-type continental margin after the closure of back-arc basin.
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.
The largest and southernmost of the Mariana Island Arc, Guam is located east of the Philippines.
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But the existence of this enormous island arc, which they believed to have stretched between Baltica and Siberia, does not agree perfectly with the data from regional geology.
Koide, "The Yakuno ophiolite, Japan: fragments of Permian island arc and marginal basin crust with the hotspot," in Ophiolites Oceanic Crustal Analogues: Proceedings of the Symposium "Troodos 1987", J.
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. Although the Lesser Antilles is considered one of the most seismically active regions in the Caribbean, few of these events have been greater than M7.0 over the past century.