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- Volcanic_arc abstract "A volcanic arc is a chain of volcanoes positioned in an arc shape as seen from above. Offshore volcanoes form islands, resulting in a volcanic island arc. Generally they result from the subduction of an oceanic tectonic plate under another tectonic plate, and often parallel an oceanic trench. The oceanic plate is saturated with water, and volatiles such as water drastically lower the melting point of the mantle. As the oceanic plate is subducted, it is subjected to greater and greater pressures with increasing depth. This pressure squeezes water out of the plate and introduces it to the mantle. Here the mantle melts and forms magma at depth under the overriding plate. The magma ascends to form an arc of volcanoes parallel to the subduction zone.These should not be confused with hotspot volcanic chains, where volcanoes often form one after another in the middle of a tectonic plate, as the plate moves over the hotspot, and so the volcanoes progress in age from one end of the chain to the other. The Hawaiian Islands form a typical hotspot chain; the older islands (tens of millions of years) to the northwest are smaller and more lush than the recently created (400,000 years ago) Hawaii island itself, which is more rocky. Hot spot volcanoes are also known as "Intra-plate" volcanoes and the islands they create are known as Volcanic Ocean Islands. Volcanic arcs do not generally exhibit such a simple age pattern.There are two types of volcanic arcs: oceanic arcs form when oceanic crust subducts beneath other oceanic crust on an adjacent plate, creating a volcanic island arc. (Not all island arcs are volcanic island arcs.) continental arcs form when oceanic crust subducts beneath continental crust on an adjacent plate, creating an arc-shaped mountain belt. (Not all mountain belts are formed this way.)In some situations, a single subduction zone may show both aspects along its length, as part of a plate subducts beneath a continent and part beneath adjacent oceanic crust. (The term "volcanic arc" is often confused with the term "island arc". The former is a series of volcanoes, but not necessarily offshore. The latter is a series of islands, not necessarily composed solely of volcanoes.) Volcanoes are present in almost any mountain belt, but this does not make it a volcanic arc. Often there are isolated, but impressively huge volcanoes in a mountain belt. For instance, Vesuvius and the Etna volcanoes in Italy are part of separate but different kinds of mountainous volcanic ensembles.The active front of a volcanic arc is the belt where volcanism develops at a given time. Active fronts may move over time (millions of years) changing their distance from the oceanic trench as well as their width.".
- Volcanic_arc thumbnail Casta_Marianas.jpg?width=300.
- Volcanic_arc wikiPageExternalLink japan_tec.html.
- Volcanic_arc wikiPageExternalLink island_oceanic_continental.html.
- Volcanic_arc wikiPageExternalLink subducvolc_page.html.
- Volcanic_arc wikiPageID "1102339".
- Volcanic_arc wikiPageRevisionID "593753558".
- Volcanic_arc hasPhotoCollection Volcanic_arc.
- Volcanic_arc subject Category:Archipelagoes.
- Volcanic_arc subject Category:Plate_tectonics.
- Volcanic_arc subject Category:Volcanic_arcs.
- Volcanic_arc type Archipelago109203827.
- Volcanic_arc type Archipelagoes.
- Volcanic_arc type Land109334396.
- Volcanic_arc type Object100002684.
- Volcanic_arc type PhysicalEntity100001930.
- Volcanic_arc type YagoGeoEntity.
- Volcanic_arc type YagoPermanentlyLocatedEntity.
- Volcanic_arc comment "A volcanic arc is a chain of volcanoes positioned in an arc shape as seen from above. Offshore volcanoes form islands, resulting in a volcanic island arc. Generally they result from the subduction of an oceanic tectonic plate under another tectonic plate, and often parallel an oceanic trench. The oceanic plate is saturated with water, and volatiles such as water drastically lower the melting point of the mantle.".
- Volcanic_arc label "Arc volcanique".
- Volcanic_arc label "Arco volcánico".
- Volcanic_arc label "Arco vulcanico".
- Volcanic_arc label "Arco vulcânico".
- Volcanic_arc label "Volcanic arc".
- Volcanic_arc label "Vulkanische boog".
- Volcanic_arc label "火山弧".
- Volcanic_arc label "火山弧".
- Volcanic_arc sameAs Arco_volcánico.
- Volcanic_arc sameAs Arku_bolkaniko.
- Volcanic_arc sameAs Arc_volcanique.
- Volcanic_arc sameAs Arco_vulcanico.
- Volcanic_arc sameAs 火山弧.
- Volcanic_arc sameAs Vulkanische_boog.
- Volcanic_arc sameAs Arco_vulcânico.
- Volcanic_arc sameAs m.0464bv.
- Volcanic_arc sameAs Q13426043.
- Volcanic_arc sameAs Q13426043.
- Volcanic_arc sameAs Volcanic_arc.
- Volcanic_arc wasDerivedFrom Volcanic_arc?oldid=593753558.
- Volcanic_arc depiction Casta_Marianas.jpg.
- Volcanic_arc isPrimaryTopicOf Volcanic_arc.
