Series of volcanoes that lies on the continental side of an oceanic trench of a lithospheric plate. The volcanicity, whose products are mainly of intermediate composition, results from the subduction process; typically it occurs approximately 100 km above the down-going oceanic plate. Island arcs are the sites of strong seismic activity, and have distinctive thermal and magnetic properties. See also benioff zone; plate motions; plate tectonics.
Island arc
An arcuate island chain, mostly of volcanic origin, formed when oceanic crust plunges into the mantle where it undergoes subduction. The magma thus formed creates a chain of submarine volcanoes—eventual islands; see Jicha et al. (2006) Geology 34, 8 on magma flow in the Aleutian Island arc. See also Takahashi et al. (2007) Geology 35, 3.
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- Tax Exempt Special Savings Account
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- tax havens and offshore financial centres
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- taxon range zone