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island arc |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.04 sec. |
island arcLong, curved chain of oceanic islands associated with intense volcanic and seismic activity and mountain-building processes. Examples include the Aleutian-Alaska Arc and the Kuril-Kamchatka Arc. Most island arcs consist of two parallel rows of islands. The inner row is a string of volcanoes, and the outer row is made up of nonvolcanic islands. In the case of single arcs, many of the islands are volcanically active. An island arc typically has a landmass or a partially enclosed, unusually shallow sea on its concave side. Along the convex side there usually exists a long, narrow deep-sea trench. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The Kaputusan prospect is a typical Western Pacific island arc porphyry copper-gold system. A typical Island Arc type porphyry copper/ gold 'core' is now evident in the interpretation of the soil geochemical anomalies from the approximately 1km x 1km Kodu NW soil grid, weakening peripherally to a halo of molybdenum, lead and zinc geochemistry. The other half of the project area has a slightly deeper erosional level and is underlain by late Triassic to Cretaceous island arc intrusives |
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island arc
