Planchón-Peteroa volcanoPlanchón-Peteroa is an elongated complex
volcano along the Chile-Argentina border with several
overlapping calderas. It is less than 550,000 years old and was
formed by 3 different volcanoes representing different
generations of the volcano: Azufre, Planchon and Peteroa.
Peteroa has been active into historical time and contains a
small steaming crater lake. Historical eruptions from the
Planchón-Peteroa complex have been dominantly explosive,
although lava flows were erupted in 1837 and 1937. The first
volcano began its growth in the Pleistocene and constructed the
basaltic-andesite to dacitic Volcán Azufre volcano. After Azufre
volcano was built, another basaltic and basaltic-andesite
volcano grew 6 km to the north of it, Volcán Planchón volcano.
Planchon is the northernmost basaltic volcano of the volcanic
front of the Southern Volcanic Zone. It has a volume of ca. 25
km3 mainly of lava flows and very few pyroclastic rocks. The
lavas are exclusively basalt to basaltic andesite, more