Copahue

Copahue
Copahue Volcano photographed from space
Highest point
Elevation	2,997 m (9,833 ft)
Coordinates	37°51′S 71°10′W / 37.850°S 71.167°W / -37.850; -71.167Coordinates: 37°51′S 71°10′W / 37.850°S 71.167°W / -37.850; -71.167
Geography
Copahue Argentina-Chile
Location	Neuquén Province,  Argentina Bío Bío Region,  Chile
Parent range	Andes
Geology
Mountain type	Stratovolcano
Last eruption	January 6 2016

Neuquén Province,
 Argentina

Copahue (Spanish pronunciation: [koˈpawe]) is a stratovolcano in the Andes on the border of Bío Bío Region, Chile and Neuquén Province, Argentina. There are nine volcanic craters along a 2 km (1.2 mi) line, the easternmost of which is historically the most active, and contains a 300 m (1000 ft) wide crater lake with a pH ranging between 0.18 and 0.30. Eruptions from this crater lake have ejected pyroclastic rocks and chilled liquid sulfur fragments. Although the lake emptied during the 2000 eruption, it later returned to its previous levels. Copahue means "sulphur waters" in Mapuche.

Copahue sits on a basement of sedimentary and volcanic rocks ranging in age from Eocene to Pliocene. The modern volcano sits in a volcanically active area, with a caldera from the Pliocene, measuring 20 km by 15 km, lying to the east of Copahue. The modern volcano became active roughly 1.2 million years ago (Ma). The modern caldera formed 0.6 to 0.4 Ma, and produced large pyroclastic flows, extending up to 37 km from the volcano.