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| Chilean Andes volcanism | |
|---|---|
| Name | Chilean Andes volcanism |
| Location | Andes Mountains, Chile |
| Highest | Ojos del Salado |
| Type | Volcanism |
| Volcanic arc | Andean Volcanic Belt |
| Tectonic setting | Nazca Plate subduction beneath South American Plate |
Chilean Andes volcanism is the concentration of volcanic activity along the Andes Mountains within the territorial limits of Chile, shaped by subduction of the Nazca Plate beneath the South American Plate. It includes major stratovolcanoes, caldera systems, and monogenetic fields distributed across the Andean Volcanic Belt, and has produced eruptions that affected societies from pre-Columbian Inca Empire settlements to modern Santiago, Chile and international aviation. Research combines field mapping, geochronology, petrology, and geophysics by institutions such as the Servicio Nacional de Geología y Minería and the Observatorio Volcanológico de los Andes del Sur.
The Chilean segment of the Andean Volcanic Belt results from oblique convergence between the Nazca Plate and the South American Plate, modulated by the Antarctic Plate near southern latitudes and influenced by the Juan Fernández Ridge and the Nazca Ridge; key tectonic features include the Peru–Chile Trench, the Atacama Fault System, and the Liquiñe-Ofqui Fault Zone. Subduction parameters such as slab dip variation, slab rollback, and trench-parallel strike-slip along the Liquiñe-Ofqui Fault Zone control magma generation beneath edifices like Llaima and Villarrica; interactions with the Altiplano-Puna Volcanic Complex and crustal thickening under the Central Volcanic Zone generate diverse magmatic pathways influencing the distribution of caldera complexes like La Pacana and Salar de Aguas Calientes. Regional uplift and crustal shortening related to the Andean orogeny and episodes of flat-slab subduction (e.g., beneath northern Chile near the Central Volcanic Zone) modulate volcanism along trench-parallel segments including the Northern Volcanic Zone and Southern Volcanic Zone.
Volcanic activity in Chile is organized into the Northern Volcanic Zone, Central Volcanic Zone, Southern Volcanic Zone, and the Austral Volcanic Zone of the Andean Volcanic Belt, with concentrations of quaternary edifices such as Parinacota, Lascar, San José, Puyehue, Osorno, Calbuco, and Chaitén. The Altiplano-Puna Volcanic Complex spans the high plateau shared with Bolivia and Argentina and hosts giant ignimbrite provinces including Toba-scale analogues like Pastos Grandes and La Pacana; volcanic fields in the Atacama Desert comprise monogenetic vents such as Licancabur and the Purico Complex. Southern Chilean arcs intersect the Patagonian Icefields and fjord systems near Aisén Region and the Magallanes Region, where subglacial eruptions have created tuyas like Melimoyu and influenced glacial geomorphology near Torres del Paine.
The Chilean Andes host diverse edifice types: steep stratovolcanoes exemplified by Villarrica, broad lava domes and dome complexes at Chaitén and Nevados de Chillán, extensive calderas such as La Pacana and Socompa, and rhyolitic ignimbrite sheets across the Altiplano. Monogenetic cones and scoria fields, found in the Puna and Atacama regions, include Tocorpuri and Cerro Andino, while subglacial features and tuyas occur beneath icefields near Southern Volcanic Zone centers like Cerro Hudson and Mate Grande. Morphologies reflect eruptive style and magma rheology influenced by crustal thickness under Central Andes, volatile content at mid-crustal reservoirs beneath Lascar, and edifice erosion via glacial processes studied near Osorno and Lanín.
Eruptive records span from Paleozoic basement remobilization through Mesozoic arc episodes to abundant Quaternary activity preserved in stratigraphic sequences at Lascar, Llaima, Calbuco, Hudson and Chaitén. Holocene eruptions like the 2008 Chaitén eruption and the 1991 Hudson eruption produced large ash plumes affecting Punta Arenas, Bariloche, and international aviation routes monitored by the International Civil Aviation Organization and regional Darwin Volcanic Ash Advisory Center. Tephrochronology and radiometric dating (e.g., K–Ar, Ar–Ar) performed by teams from Universidad de Chile, Universidad Católica de Chile, and international collaborators constrain eruption ages for Lascar and Parinacota while paleovolcanic studies in the Atacama Desert link eruptive phases to climatic intervals recorded at Lake Chungará and Salar de Atacama.
Magma suites in Chile range from basaltic andesite at Llaima and Villarrica to dacite and rhyolite associated with calderas like La Pacana and volcanic centers in the Altiplano-Puna Volcanic Complex; petrogenesis involves subduction-related fluid fluxing of the mantle wedge beneath the Central Volcanic Zone, crustal assimilation within the thickened Central Andean crust, and fractional crystallization documented at Lascar and Puyehue. Geochemical systems show enrichments in large-ion lithophile elements correlated with slab-derived fluids from the Nazca Plate and isotopic signatures (e.g., Sr–Nd–Pb) reflecting contributions from Precambrian basement provinces such as the Chilenia Terrane and Antofalla Province. Melt inclusion studies and experimental petrology at institutions like Earth Observatory of Singapore-affiliated labs and SERNAGEOMIN projects reveal volatile budgets controlling explosivity at Chaitén, Calbuco, and dome-forming eruptions at Nevados de Chillán.
Hazards include pyroclastic flows, ashfall, lahars, debris avalanches, and volcanic gases impacting populated areas such as Concepción, Temuco, Valdivia, and Antofagasta; eruptions like Calbuco 2015 and Chaitén 2008 demonstrated regional disruption of transport corridors, fisheries in the Chilean Sea, and transboundary impacts on Argentina and southern Pacific aviation. Risk mitigation involves land-use planning by regional governments, alert protocols coordinated with SERNAGEOMIN and the International Association of Volcanology and Chemistry of the Earth's Interior, ash dispersion modelling informed by the World Meteorological Organization and the Global Volcanism Program, and community preparedness initiatives engaging municipal authorities in Araucanía Region and Los Lagos Region.
Observational networks employ seismic arrays, GPS, InSAR, gas flux monitoring, and thermal infrared satellite surveillance operated by SERNAGEOMIN, the Global Volcanism Program, and university groups from Universidad de Concepción, Universidad de Chile, and Universidad Austral de Chile. Facilities include the Observatorio Volcanológico de los Andes del Sur and collaborations with international centers such as the Smithsonian Institution and INGV; multidisciplinary projects integrate volcanology, glaciology at Instituto Antártico Chileno, and hazard communication involving the National Emergency Office of Chile (ONEMI), while training programs supported by UNESCO enhance capacity building for rapid response to events like Hudson 1991 and Chaitén 2008.
Category:Volcanism of Chile