island arc


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Related to island arc: rift valley

island arc

[′ī·lənd ¦ärk]
(geography)
A group of volcanic islands, usually situated in a curving arch-like pattern that is convex toward the open ocean, having a deep trench or trough on the convex side and usually enclosing a deep basin on the concave side; formed by volcanic activity associated with oceanic plate subduction at convergent plate margins. Also known as volcanic arc.
References in periodicals archive ?
Compared with depleted high-field-strength elements, they show notable characteristics of depleted Nb and Ta, which is similar to that of island arc magmatite in subduction zone; both of their mineral compositions are generally consistent with those of amphibole calc-alkaline granitoid (ACG) under the mechanism of subduction (Lei et.
5; Table 4) based discrimination diagrams were applied for discrimination of island arc (IAB), continental rift (CRB), ocean-island (OIB) and mid-ocean ridge (MORB) tectonic settings.
1980: The Lesser Antilles -- A discussion of the Island arc magmatism.
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.
Systematic changes in the distribution of some oxides in the profile from the continent towards the island arc across the Philippine Sea can be stated: CaO and S[O.
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.
The western region is characterised by at least two island arc systems (Ramos, 1991).