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| Llullaillaco Sur | |
|---|---|
| Name | Llullaillaco Sur |
| Elevation m | 6739 |
| Range | Andes (Puna de Atacama) |
| Location | Argentina–Chile border region, Jujuy Province / Antofagasta Region |
| Coords | 24°43′S 68°19′W |
| Type | Stratovolcano |
| Last eruption | Holocene (unconfirmed) |
Llullaillaco Sur Llullaillaco Sur is a high Andean stratovolcano in the southern Puna de Atacama on the Argentina–Chile frontier, forming part of a complex that includes the better-known Llullaillaco massif and adjacent volcanic edifices. The peak lies within the drainage divide between the Atacama Desert and the high plateau and is situated near provincial boundaries such as Jujuy Province and regions like Antofagasta Region. Its prominence and location place it among notable Andean volcanoes studied alongside Ojos del Salado, Llullaillaco (main summit), and Pular for comparative volcanology, glaciology, and high-altitude archaeology.
Llullaillaco Sur occupies a position within the central Andes volcanic arc related to subduction of the Nazca Plate beneath the South American Plate. The edifice is part of the Puna-Altiplano volcanic province that also includes Llullaillaco, Incahuasi, Socompa, Licancabur, and San Pedro de Atacama-area volcanoes. Regional tectonics link it to structures such as the Atacama Fault Zone, the Calama-Olacapato-El Toro fault, and the broader Andean orogenic belt associated with the Altiplano-Puna Magma Body. Petrologically, lava types range from andesitic to dacitic compositions similar to those erupted at El Tatio and Lastarria, with phenocryst suites comparable to biotite, hornblende, and plagioclase assemblages reported from neighboring summits. Geomorphological relations tie Llullaillaco Sur to paleolake basins such as Lago Minchin and Lake Titicaca-era hydrology and to volcanic alignments seen near Sairecabur and Cerro Purico.
Chronology of Llullaillaco Sur involves Quaternary volcanism with stages of edifice construction, flank lava flows, and explosive episodes analogous to eruptions documented at Lascar, Chiles–Cerros de San Pedro, and Villarrica. Radiometric dates from coeval Andean centers such as Ojos del Salado and Corazones frame likely Holocene to late Pleistocene activity at the southern Llullaillaco complex. Tephrostratigraphic correlations with widespread ash layers studied near Arica and Salta suggest explosive phases that deposited pyroclastic material across the Altiplano. Geochemical similarities to magmas at Cerro Galán and Llullaillaco main summit indicate crustal assimilation and fractional crystallization processes consistent with the regional magmatic evolution driven by subduction and delamination events compared in studies of Cordillera de los Andes magmatism.
The summit area of Llullaillaco Sur exhibits typical high-altitude Andean morphology with steep radial ridges, summit craters, and remnant ice bodies. During glacial maxima, valley glaciers and cirque glaciers extended from the summit, comparable to records from Nevado Ojos del Salado, Cerro Bonete, and Sajama. Modern cryospheric remnants include perennial snowfields and rock glaciers analogous to features on Parinacota and Pomerape, with periglacial patterned ground and solifluction lobes documented across the Puna. Paleoglacial reconstructions draw on moraines correlated to regional stadials such as those recorded near Uturunku and Sierra de Famatina.
Llullaillaco Sur sits in an extreme high-elevation Puna environment characterized by arid conditions influenced by the Humboldt Current and subtropical high-pressure systems affecting Atacama rainfall patterns. Vegetation is sparse, with tussock grass-dominated steppe, Polylepis remnants at lower elevations analogous to stands near Abra Pampa and Socompa, and high-Andean fauna such as vicuña, guanaco, Andean condor, and small rodents comparable to species in Eduardo Avaroa Andean Fauna National Reserve. Avifaunal and insect assemblages reflect biogeographic connections to Altiplano ecosystems studied at Sajama, Los Flamencos National Reserve, and Salinas Grandes.
The broader Llullaillaco region bears intensive human history and ceremonial archaeology exemplified by high-altitude ritual sites discovered on Llullaillaco main summit and elsewhere in the central Andes by investigators affiliated with institutions like Universidad Católica de Salta, National Geographic Society, and museums including Museo de Arqueología de Alta Montaña (MAAM). Pre-Columbian cultures such as the Inca Empire, Tiwanaku, Diaguita, and local hunter-gatherer groups used trans-Andean routes and altiplano corridors near Llullaillaco Sur for pastoralism, llama caravans, and ritual pilgrimage comparable to patterns recorded at Qhapaq Ñan corridors and Aconcagua-region shrines. Ethnohistoric sources referencing colonial-era routes between Potosí, Salta, and Antofagasta contextualize human use of passes adjacent to the volcano.
Mountaineers and scientific parties have approached Llullaillaco Sur in conjunction with ascents of nearby peaks such as Llullaillaco (main summit), Ojos del Salado, and Incahuasi. Expeditions organized through clubs like the Club Andino de Chile, Club Andino Salteño, and international alpine teams have documented routes, altimeter readings, and high-elevation physiology studies similar to those performed on Aconcagua and Huascarán. Logistic staging often involves bases at settlements like Salar de Pocitos, Antofagasta de la Sierra, and access via roads used for scientific campaigns by universities and agencies such as CONICET and Servicio Nacional de Geología y Minería.
Conservation concerns include protection of fragile high-Andean ecosystems analogous to initiatives at Reserva Nacional Los Flamencos and Eduardo Avaroa Andean Fauna National Reserve, while volcanic hazards mirror risks from lahars, ashfall, and phreatomagmatic activity documented at Lascar and Lastarria. Cross-border management implicates agencies from Argentina and Chile and international monitoring collaborations like those involving Observatorio Vulcanológico de los Andes del Sur and regional seismic networks. Climate-driven glacier retreat, mining interests near the Puna and water resource competition affecting basins such as Río Grande de Jujuy pose additional pressure that informs risk assessments used by local authorities and conservation organizations.
Category:Volcanoes of Argentina Category:Volcanoes of Chile Category:Stratovolcanoes Category:Andes