Planchon Peteroa volcano, Chile
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Planchon Peteroa volcano, Chile/Argentina
An aerial view from the NW overlooks Planchon-Peteroa, a complex volcano with several overlapping calderas.
In the left foreground is the caldera wall of Planchon volcano.
The crater complex of Peteroa is in the center, and Volcan Azufre lies at the upper right.
Activity began in the Pleistocene at Volcan Azufre, followed by formation of Volcan Planchon, 6 km to the north.
Volcan Peteroa has been active into historical time and contains a small steaming crater lake.
Planchon-Peteroa is an elongated complex volcano along the Chile-Argentina border with several overlapping calderas.
Activity began in the Pleistocene with construction of the basaltic-andesite to dacitic Volcan Azufre, followed by formation of basaltic and basaltic-andesite Volcan Planchon, 6 km to the north.
About 11,500 years ago, much of Azufre and part of Planchon collapsed, forming the massive Rio Teno debris avalanche, which traveled 95 km to reach Chile's Central Valley. Subsequently, Volcan Planchon II was formed.
The youngest volcano, andesitic and basaltic-andesite Volcan Peteroa, consists of scattered vents between Azufre and Planchon. Peteroa has been active into historical time and contains a small steaming crater lake.
Historical eruptions from the Planchon-Peteroa complex have been dominantly explosive, although lava flows were erupted in 1837 and 1937.
PHOTO SOURCE:Photo by Oscar Gonzalez-Ferran (University of Chile).
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