Copahue

Copahue
Copahue

Copahue's southwest face with Laguna Las Totoras in the foreground.
Elevation 2,997 m (9,833 ft) [1]
Location
Copahue is located in Argentina
Copahue
Location on Argentina/Chile border
Location Argentina and Chile
Range Andes
Coordinates 37°51′S 71°10′W / 37.85°S 71.167°W / -37.85; -71.167Coordinates: 37°51′S 71°10′W / 37.85°S 71.167°W / -37.85; -71.167[1]
Geology
Type Stratovolcano
Last eruption 2000[1]

Copahue is a stratovolcano on the border between Argentina and Chile. There are nine volcanic craters along a 2 km (1.2 mi) line, and the eastern summit crater contains a briny, acidic 300 m (1000 ft) wide crater lake. Twentieth-century eruptions from the crater lake have ejected pyroclastic rocks and chilled liquid sulfur fragments. [1]


Contents

Geology and Geography

Copahue sits on a basement of sedimentary and volcanic rocks ranging from the Eocene to the Pliocene[2]. 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

The crater lake at the eastern summit of Copahue Volcano.
Copahue Crater Lake.

volcano became active roughly 1.2 Ma[2]. The modern caldera formed .6 to .4 Ma, and produced large pyroclastic flows, extending up to 37 kilometers from the volcano[2].

The modern structure is an elongated shield volcano, with a maximum thickness of 22 kilometers and a minimum of 8 kilometers[2]. There have been at least 6 eruptions within the Holocene, with the most recent in 2000. The easternmost (and most active) crater contains a crater lake with a pH ranging between .18 and .30[2]. While it emptied during the 2000 eruption, it has returned to its previous levels.

References

  1. ^ a b c d "Copahue". Global Volcanism Program, Smithsonian Institution. http://www.volcano.si.edu/world/volcano.cfm?vnum=1507-09=. Retrieved 2005-02-11. 
  2. ^ a b c d e Naranjo, Jose; Polanco, Edmundo (2004). "The 2000 AD eruption of Copahue Volcano, Southern Andes". Revisita Geologica de Chile 31 (2): 279–292. 

Bibliography

See also



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