Champ volcanique de San Juan

Source: Uwe Dedering

Copyright: Creative Commons CC BY-SA 3.0

Description

Le champ volcanique de San Juan, en anglais San Juan volcanic field, est un champ volcanique des États-Unis situé dans le Sud-Ouest du Colorado. Il est composé de sept caldeiras dont la plus importante est celle de La Garita avec 75 kilomètres de longueur pour 35 kilomètres de largeur. Ces caldeiras ce sont formées au cours de deux phases volcaniques. La première à l'Oligocène est marquée par des brèches, des tufs et des laves et correspondrait à une subduction tandis que la seconde, au Miocène et au Pliocène et marquée par des laves basaltiques, serait en relation avec la fonte partielle de la croûte lithosphérique dont le magma serait parvenu en surface.

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Source: Wikipedia.org

Copyright: Creative Commons 3.0

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Source: Uwe Dedering

Copyright: Creative Commons CC BY-SA 3.0

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Source: Uwe Dedering

Copyright: Creative Commons CC BY-SA 3.0

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