|Elevation||2,300 m (7,500 ft)|
|Prominence||2,066 m (6,778 ft)|
|Last eruption||1560 ± 110 years|
Cerro Macá is a stratovolcano located to the north of the Aisén Fjord and to the east of the Moraleda Channel, in the Aysén del General Carlos Ibáñez del Campo Region of Chile. This glacier-covered volcano lies along the regional Liquiñe-Ofqui Fault Zone.
Cerro Macá is a relatively small volcano with a volume of only 39 cubic kilometres (9.4 cu mi). It has a summit elevation of approximately 2,300 m above sea level and features glaciers that in 2011 covered an area of 27.62 square kilometres (10.66 sq mi). The edifice is partially eroded and a sector collapse is probably the origin of a large steep sided depression in the summit area. Pyroclastic cones with associated lava flows are found on its southwestern flank but also on the other slopes of the volcano, as far down as sea level and in the Bahia Aysen.
The volcano is part of the southernmost Southern Volcanic Zone of Chile, where volcanism is caused by the subduction of the Nazca Plate. Other volcanoes in the area are Melimoyu, Mentolat, Cay and Cerro Hudson. Macá specifically is formed by basalt and basaltic andesite.
1,440 ± 40 calibrated radiocarbon years ago a moderate explosive eruption deposited the MAC1 tephra, which reaches thicknesses of 10–15 centimetres (3.9–5.9 in) 70 kilometres (43 mi) east of Macá. Ash from past eruptions has been tentatively identified close to Cochrane Lake. A more recent eruption occurred from the Bahía Pérez cinder cone on the southwestern flank in 1560 ± 110 years.
In the early 20th century volcanic activity was observed at Ensenada Pérez, close to the southwestern flank of Macá.
- The elevation given here is from SRTM data and independently confirmed by ASTER GDEM. Elevations around 3,000 m given by other authorities should be discounted. The contours around the summit are missing from official Chilean topographic mapping.
- "Argentina and Chile, Southern: Patagonia Ultra-Prominences" Archived 2015-04-09 at the Wayback Machine Peaklist.org. Listed as "Volcán Maca". Maca is a smooth volcanic cone, and SRTM indicates a summit elevation of 2300m ± 20m. This is supported by Biggar in "The Andes". Cited elevations of 2960-3079m are based on gross exaggeration.Note 9 Retrieved 2012-04-16.
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