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| Uturunku | |
|---|---|
| Name | Uturunku |
| Elevation m | 6008 |
| Range | Andes |
| Location | Potosí Department, Bolivia |
| Type | Stratovolcano |
Uturunku Uturunku is a high Andean stratovolcano in the Cordillera Occidental (Bolivia), situated in the Potosí Department of Bolivia. It has been a focus of multidisciplinary studies involving geodesy, seismology, petrology, glaciology, and geochemistry because of notable long-term inflation and volcanic unrest that drew comparisons with volcanic systems such as Yellowstone Caldera, Campi Flegrei, and Taupo Volcanic Zone. Researchers from institutions including the United States Geological Survey, Smithsonian Institution, Instituto Geofísico del Perú, and various universities have applied techniques developed for studies at Mount St. Helens, Mount Fuji, Kilimanjaro, and Cotopaxi.
Uturunku rises within the Altiplano near the border with Chile and is part of the Central Volcanic Zone of the Andes. The edifice lies adjacent to features such as the Socompa volcanic complex, the Uyuni Salt Flat (Salar de Uyuni), and the Tocorpuri volcanic group, and it influences drainage into endorheic basins like Salar de Coipasa. Its summit elevation places it among peaks like Nevado Sajama and Licancabur and within the Potosí topographic province near the city of Potosí. Glacial cirques and moraines on its flanks relate Uturunku to regional Pleistocene ice history studied alongside Cordillera Real glaciers and Quelccaya ice cap reconstructions. The volcano's flanks host andesite to dacite outcrops comparable to lithologies at Mount Etna and Mount Merapi.
Uturunku is situated above a subduction zone where the Nazca Plate descends beneath the South American Plate, a tectonic setting shared with Parinacota, Guallatiri, and Llullaillaco. The volcanic stratigraphy records episodes of erupted lavas, domes, and pyroclastic deposits, and links to regional ignimbrites such as those from the Altiplano-Puna volcanic complex, which include the Purico Complex and the Puyehue-Cordón Caulle system. Geochronological work using argon–argon dating and uranium–lead dating has placed many Andean events into Miocene and Pliocene frameworks, with Uturunku’s materials often compared to sequences at Cerro Galán and Lascar. The edifice overlies metamorphic basement units correlated with the Precambrian and Paleozoic terrains sampled in Tarija Province and Chuquisaca Department.
Holocene activity at Uturunku is poorly constrained but suspected from geomorphology and tephrostratigraphy that researchers correlate with deposits studied near Lake Titicaca and distal ash layers traced toward Argentina. Volcanic hazards assessments have considered scenarios similar to eruptions at Nevado del Ruiz, El Misti, and Chaitén involving lahars, pyroclastic density currents, and ashfall that could affect communities such as Uyuni and infrastructure like regional roads linking Oruro and Potosí. Paleovolcanological mapping compares Uturunku’s deposits with those of the Arequipa volcanic belt and eruption records maintained by the Global Volcanism Program and national observatories.
Uturunku became prominent in geophysical literature after detection of prolonged inflation and seismicity documented by networks operated by IRIS, Incorporated Research Institutions for Seismology, and national agencies. Studies employed GPS networks, InSAR interferometry from satellites such as ERS-1, Envisat, and ALOS, and dense seismic arrays similar to deployments at Long Valley Caldera and Mount Erebus. Observations revealed uplift episodes extending over decades, prompting analogies to caldera unrest at Campi Flegrei and Yellowstone National Park. Geodetic inversion and tomographic imaging linked uplift to magmatic or hydrothermal processes, using methodologies developed by groups at MIT, Caltech, ETH Zurich, Imperial College London, and University of Alaska Fairbanks.
Rock compositions on Uturunku include intermediate to silicic suites—andesites, dacites, and rhyodacites—bearing minerals such as plagioclase, hornblende, biotite, and accessory magnetite and apatite. Geochemical signatures show enrichment patterns analogous to arc volcanism documented at Andean Volcanic Arc centers like Independencia and San Pedro. Isotopic studies (Sr-Nd-Pb) performed by laboratories at Utrecht University, University of Geneva, and University of California, Berkeley have informed models of crustal assimilation and mantle source heterogeneity, comparable to interpretations for Cerro Blanco and Río Colorado magmas. Petrologic work employed experimental petrology techniques pioneered at University of Tokyo and University of Minnesota.
The high-elevation environment around Uturunku lies within puna and Altiplano ecosystems characterized by bofedales and xeric puna vegetation, sharing biogeographic affinities with habitats near Sajama National Park and Eduardo Avaroa Andean Fauna National Reserve. Fauna include camelids such as vicuña and llama, and bird species like Andean condor and James's flamingo observed in nearby wetlands such as Salar de Uyuni margins. Climate regimes follow orographic precipitation patterns governed by the South American summer monsoon and Humboldt Current influences, with cryospheric studies connecting local snowline changes to records from Quelccaya Ice Cap and Glacier National Park (Montana)-style monitoring programs.
The volcano occupies territory historically used by pre-Columbian populations linked to societies such as the Wari and later Inca Empire, with archaeological parallels to sites in Potosí Department and ritual mountains like Apu peaks in Andean cosmology. Colonial and modern era mining in nearby provinces ties Uturunku to economic centers including the city of Potosí and trade routes across the Altiplano. Contemporary scientific engagement has involved collaborations among institutions like Universidad Mayor de San Andrés, Universidad Autónoma Tomás Frías, and international teams from University of Colorado Boulder and University of Oxford, integrating indigenous stakeholder concerns with hazard planning conducted by national authorities such as the Servicio Nacional de Meteorología e Hidrología de Bolivia.
Category:Volcanoes of Bolivia Category:Six-thousanders of the Andes