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| Copiapó volcano | |
|---|---|
| Name | Copiapó volcano |
| Elevation m | 6060 |
| Location | Atacama Region, Chile |
| Range | Andes |
| Type | Stratovolcano |
| Last eruption | Holocene (uncertain) |
Copiapó volcano is a major stratovolcano in the southern Atacama Desert of northern Chile, rising to about 6,060 metres in the Andes and forming part of the high Andean volcanic arc. It is situated near the border of the Atacama Region and lies within the tectonic framework influenced by the Nazca Plate and the South American Plate. The edifice and surrounding volcanic field are notable in studies of Andean orogeny, Altiplano-Puna volcanic complex, and glacial–volcanic interactions in hyperarid environments.
The volcano is a composite cone built upon older volcanic and plutonic basement rocks related to the Laramide orogeny and subsequent Andean magmatism. Its morphology includes a broad summit caldera complex and several subsidiary cones and lava domes, with flanks cut by radial drainage and erosion attributable to ancient and modern glaciation. The regional lithology includes andesites, dacites and rhyolites associated with the Central Volcanic Zone and intrusions comparable to those exposed in the Cordillera de la Costa and the Cordillera Occidental. Geomorphological mapping integrates data from the ASTER and Landsat satellite missions, as well as field surveys comparable to work conducted on Ojos del Salado and Llullaillaco.
Volcanic activity at the edifice spans Pliocene to Holocene ages, with episodic explosive and effusive phases documented by stratigraphic correlations with regional tephra layers and radiometric dating such as K–Ar and Ar–Ar methods. Major eruptive phases correlate temporally with volcanic sequences observed at Sairecabur and Puleg (regional analogues), and distal tephra horizons have been compared with records from the Altiplano lake cores and the Bolivian Altiplano paleoclimate archives. Although no confirmed historical eruptions are recorded in colonial chronicles like those kept in Santiago, Chile and La Serena, geomorphic evidence indicates Holocene dome emplacement and pyroclastic deposits similar to those mapped at Cerro Blanco and San Pedro de Atacama volcanic centers.
Rocks from the volcano range from high-K calc-alkaline andesites to dacites and rhyolites, showing phenocryst assemblages of plagioclase, hornblende, biotite and orthopyroxene, typical of magmas affected by crustal assimilation in thick continental crust settings like the Altiplano-Puna plateau. Geochemical signatures include enrichment in large-ion lithophile elements and variable rare-earth element patterns that suggest fractional crystallization and crustal contamination processes analogous to those interpreted at Puyehue-Cordón Caulle and Licancabur. Isotopic systems (Sr–Nd–Pb) reflect mixed mantle and continental crust sources, comparable to datasets from the Central Volcanic Zone and studies published concerning the Southern Volcanic Zone.
The volcano sits above the subduction zone where the Nazca Plate descends beneath the South American Plate, a setting that generates arc magmatism along the Central Volcanic Zone. Slab geometry, including slab dip and variations associated with the Juan Fernández Ridge and the Nazca Ridge, influence magma generation and volcanic lineaments across northern Chile, as observed at volcanic chains such as Cerro Lagunas and Incahuasi. Regional fault systems related to the Andean thrust belt and the Atacama Fault System provide structural controls on magma ascent, vent localization and sector collapse processes analogous to those documented at El Misti and Tupungatito.
Despite the hyperarid conditions of the Atacama Desert, high-elevation glaciers and perennial snowpacks have modified the volcano's morphology; moraines, trimlines and cirque remnants correlate with regional glaciation episodes synchronous with the Last Glacial Maximum and late Pleistocene advances recorded across the Altiplano. Glacial retreat in the Holocene has exposed morainal sequences comparable to those studied on Cerro Aconcagua and Llullaillaco, and interactions between meltwater and eruptive deposits have produced lahars and increased erosional incision, with sediment signals detectable in nearby endorheic basins and saline lakes such as Laguna Verde analogues. Modern climate studies reference datasets from the European Centre for Medium-Range Weather Forecasts and regional meteorological stations in Antofagasta province.
The surrounding region bears archaeological and historical traces linking pre-Columbian Andean societies—such as those associated with the Inca Empire and earlier hunter-gatherer groups—to high-altitude ritual sites and transit corridors across the Atacama. Colonial-era explorers and 19th-century scientific expeditions from institutions such as the British Museum and the Comisión Científica del Pacífico documented the high Andes, while 20th-century geologists from universities like the University of Chile and Universidad Católica del Norte carried out systematic volcanological and petrological investigations. Mountaineering and scientific ascents mirror those made on Ojos del Salado and San Jose (volcano), with logistical support historically staged from towns including Copiapó (city), Chañaral and Caldera.
Potential hazards include explosive eruptions, pyroclastic density currents, lava dome collapse, lahars triggered by rapid melting of summit snowfields, and distal ashfall affecting air traffic routes used by carriers connecting Santiago, Chile and Antofagasta. Monitoring efforts employ seismic networks coordinated by the Servicio Nacional de Geología y Minería (SERNAGEOMIN), satellite remote sensing from agencies like NASA and the European Space Agency, and ground deformation surveillance utilizing GPS and InSAR techniques similar to programs at Nevado del Ruiz and Villarrica. Emergency management planning references national frameworks from Chilean civil protection agencies and regional authorities based in Atacama Region municipalities.
Category:Volcanoes of Atacama Region Category:Stratovolcanoes of Chile