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.
References in periodicals archive ?
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.
Eighteen contributed chapters honoring Windley's influence are arranged in sections on oceanic and island arc systems and continental growth, the tectonics of accretionary orogens and continental growth, growth and stabilization of continental crust (collisions and intraplate processes), Precambrian tectonics and the birth of continents, and active tectonics and geomorphology of continental collision and growth zones.
Fiji forms part of the Southwest Pacific island arc system, which marks the boundary between the Indo-Australia and Pacific plates.
Pinet and Tremblay (1995) proposed that emplacement of the Quebec ophiolites was caused by the collision of an island arc with the North American continent during the Ordovician.
1, Sumatera is like other islands of Indonesia, representing and island arc where the formation was related to the activity of subduction zone.
Ruang volcano, not to be confused with the better known Raung volcano on the island of Java, is the southernmost volcano in the Sangihe Island arc.
Shoshonitic volcanic suites are common in island arc volcanism and have been identified in the New Guinea Highlands (Mackenzie and Chappell 1972) and in Eastern New Guinea, including the offshore D'Entrecasteaux Island group (Jakes and Smith 1970; Smith 1972; Johnson et al.
Managua is within the island arc Los Ranchos formation, as is the Pueblo Viejo volcanic center, 50 kilometers to the west, where Placer Dome's 35 million ounce gold mine contains resources of 544 million tons with 2 g/t gold and 12 g/t silver.
He explains the striking group of three volcanoes that form a line along the Tharsis Ridge as extinct island arc volcanoes, comparable to the Japanese island chain.