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| Socompa | |
|---|---|
| Name | Socompa |
| Elevation m | 6051 |
| Location | Argentina–Chile border region, Salta Province, Jujuy Province |
| Range | Andes, Puna de Atacama |
| Type | Stratovolcano, lava dome complex |
| Last eruption | Holocene (uncertain) |
Socompa is a stratovolcanic complex located in the high Andes on the Argentina–Chile margin within the Puna de Atacama plateau. The peak rises to about 6,051 meters and forms part of a chain of Neogene to Quaternary volcanic centers associated with the Nazca Plate subduction. Socompa is noted for its large debris avalanche scar, active fumarolic area, and archaeological sites on its slopes.
Socompa sits near the international boundary adjacent to the Puna, the Altiplano, and the Atacama Desert, lying within proximity to Salar de Pocitos, Salar de Antofalla, Salar de Arizaro, San Antonio de los Cobres, and Toconquis. The mountain is part of the Central Volcanic Zone of the Andes and is associated with the subduction of the Nazca Plate beneath the South American Plate, similar to other centers such as Licancabur, Lascar, Ojos del Salado, San Pedro de Tatara, and Llullaillaco. Regional tectonics tie Socompa to the Calama–Olacapato–El Toro fault system and the nearby Galán volcanic complex, the Cerro Tuzgle volcanic field, and the Laguna de Pozuelos area. Local stratigraphy includes andesitic to dacitic lavas, ignimbrites comparable to those erupted from Cerro Galán, pyroclastic sequences akin to deposits at Puyehue–Cordón Caulle, and widespread tephra correlated with other Central Volcanic Zone events.
Socompa's eruptive history spans Pliocene to Holocene time with multiple effusive and explosive phases. Magmas show calc-alkaline to high-K calc-alkaline affinities, chemically related to rocks from Lascar, Guallatiri, Uturuncu, Cerro Negro de Mayasquer, and Antofalla. Eruptive products include lava domes, block-and-ash flows, and pyroclastic deposits similar in character to those at Chiles, Tucurui? and San Pablo de Lípez fields. A major sector collapse produced a volcanic debris avalanche comparable to the Mount St. Helens 1980 event and to ancient collapses at Ojos de Maricunga and Cerro Hudson. Holocene fumarolic activity has been reported, resembling persistent degassing seen at Copahue, Turrialba, and Poás.
The edifice displays glacial landforms including cirques, moraines, and trimlines analogous to glaciation records at Nevado Sajama, Chungará, Parinacota, Illimani, and Huascarán. Periglacial processes and solifluction have modified the volcanic terrain much as on Llullaillaco and Ollagüe. The collapse scar exposes internal stratigraphy and hydrothermal alteration zones comparable to those observed at Mount St. Helens and Bezymianny. Rock glaciers and talus slopes around Socompa match features described for Nevado de Cachi, Cerro Aconcagua, Sierra Nevada de Santa Marta, and other high Andean summits.
Socompa lies in an arid high-altitude puna ecosystem sharing biotic affinities with the Altiplano, Atacama Desert, and puna grasslands of Jujuy Province and Salta Province. Vegetation is sparse, with cushion plants and ichu grasses comparable to communities on Llullaillaco, Cerro Bonete Chico, and Cerro Guacha. Faunal assemblages include high-Andean birds and camelids similar to fauna near Salar de Uyuni, Eduardo Avaroa National Reserve, Sajama National Park, and Reserva Nacional Los Flamencos. Climate is cold and hyperarid with strong diurnal temperature ranges like those at Ojos del Salado and La Quiaca, and high solar radiation comparable to conditions recorded at Observatorio Cerro Tololo and ALMA site altitudes.
The slopes of Socompa host archaeological remains, sacrificial platforms, and trails connected to Andean ritual landscapes akin to sites on Llullaillaco, Aconcagua, Pukara de Quitor, and Tiwanaku-related routes. Artifacts and ceremonial offerings echo practices recorded in Inca Empire high-altitude pilgrimages and resemble finds from Cerro El Plomo, Ampato, Misti, and Chachani. Historic and prehispanic use of the region links to trans-Andean exchange networks involving Atacama people, Diaguita, Kolla, and later colonial routes tied to Salta and Potosí. Modern scientific expeditions have involved institutions such as CONICET, Universidad de Buenos Aires, University of Chile, and international teams from Smithsonian Institution and University of Cambridge.
Potential hazards include future sector collapse, pyroclastic flows, ashfall affecting communities like San Antonio de los Cobres and infrastructure such as the Belgrano Railway corridor, and glacial outburst floods analogous to events at Nevado Huascarán and Cerro Hudson. Monitoring efforts draw on regional networks operated by agencies including INGV, SERNAGEOMIN, Servicio Geológico Minero Argentino (SEGEMAR), Instituto Geográfico Nacional (Argentina), and collaborations with USGS and university volcanology programs. Geophysical surveys, gas geochemistry, and remote sensing from platforms like Landsat, Sentinel-2, ASTER, and ALMA-related infrastructures are applied to assess deformation, thermal anomalies, and fumarolic activity.
Category:Volcanoes of Salta Province Category:Stratovolcanoes Category:Andean volcanoes