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Andean Volcanic Belt : ウィキペディア英語版
Andean Volcanic Belt

The Andean Volcanic Belt is a major volcanic belt along the Andean cordillera in Argentina, Bolivia, Chile, Colombia, Ecuador and Peru. It formed as a result of subduction of the Nazca Plate and Antarctic Plate underneath the South American Plate. The belt is subdivided into four main volcanic zones that are separated from each other by volcanic gaps. The volcanoes of the belt are diverse in terms of activity style, products and morphology. While some differences can be explained by which volcanic zone a volcano belongs to, there are significant differences within volcanic zones and even between neighboring volcanoes. Despite being a type location for calc-alkalic and subduction volcanism, the Andean Volcanic Belt has a large range of volcano-tectonic settings, such as rift systems and extensional zones, transpressional faults, subduction of mid-ocean ridges and seamount chains apart from a large range on crustal thicknesses and magma ascent paths, and different amount of crustal assimilations.
Romeral in Colombia is the northernmost member of the Andean Volcanic Belt.〔(【引用サイトリンク】title=Romeral ) Global Volcanism Program〕 South of latitude 49° S within the Austral Volcanic Zone volcanic activity decreases with the southernmost volcano Fueguino in Tierra del Fuego archipelago.
==Volcanic zones==

The Andean Volcanic Belt is segmented into four main areas of active volcanism; the Northern, Central, Southern and Austral volcanic zones, each of which is a separate continental volcanic arc.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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