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| Parinacota (volcano) | |
|---|---|
| Name | Parinacota |
| Elevation m | 6342 |
| Location | border of Chile and Bolivia |
| Range | Andes |
| Type | Stratovolcano |
| Last eruption | ~290 CE (approx.) |
| Coordinates | 18°11′S 69°36′W |
Parinacota (volcano) is a steep, symmetrical stratovolcano on the Chile–Bolivia border in the Andes of northern Chile and western Bolivia. The mountain forms a prominent twin with the adjacent Pomerape and crowns the high Altiplano near Lake Chungará, the Sajama National Park area and the trans-Andean corridor. Parinacota rises above a landscape shaped by glaciation, volcanism and endorheic basins and is a landmark for Aymara people, Atacama Desert travelers and scientific expeditions.
Parinacota is situated in the Arica y Parinacota Region of Chile and the Oruro Department of Bolivia, near the Chungará–Lauca National Park boundary and east of the Altiplano–Puna volcanic complex. The volcano lies close to the Siloli Desert route, the Bolivian Altiplano, and the transcontinental Pan-American Highway corridor, dominating vistas that include Lake Chungará, the Salar de Coipasa, and the Salar de Uyuni region. Surrounding municipalities and communities include Putre, Curahuara de Carangas, and settlements tied to the Aymara people, with access routes from the Bolivian Route 4 and Chilean regional roads. Parinacota's position reflects subduction dynamics between the Nazca Plate and the South American Plate, and it is part of the wider volcanic arc that includes Licancabur, Sajama, and Guallatiri.
Parinacota is a classic stratovolcano with a near-perfect cone composed of alternating lava flows, pyroclastic deposits and debris-avalanche deposits. Its edifice overlies an older volcanic basement that includes rocks correlated with the Pliocene and Miocene volcanic provinces of the Central Volcanic Zone. The magma system shows andesitic to dacitic compositions similar to those of Aucanquilcha, Irazu, and Sierra Nevada de Lagunas Bravas, with petrology indicating fractional crystallization and crustal assimilation common to other arc volcanoes such as Villarrica and Llaima. Structural features include a summit crater, flanking parasitic vents, collapse scarps, and debris-avalanche deposits analogous to events at Mount St. Helens and Bezymianny. Regional tectonics incorporate the influence of the Altiplano plateau uplift, the Cerro Galán caldera system and the nearby Chungará volcanic complex.
Radiocarbon and tephrochronology constrain Parinacota's major edifice-building eruptions to the late Pleistocene and Holocene, with a significant collapse event forming a large debris-avalanche deposit dated to the late Holocene and a summit eruption approximately in the first millennium CE. Correlative tephra layers have been compared with deposits from Lascar, Hudson, and Toconao activity across the southern Andes. Hazards from renewed activity include pyroclastic flows, ashfall affecting Arica, La Paz, and regional airports, lahars that could impact the Lake Chungará basin and downstream communities such as Putre and Parinacota, Chile, and sector collapse similar to the 1980 Mount St. Helens event or the 1902 Mount Pelée catastrophe. Monitoring and hazard planning reference models developed for Cotopaxi, Nevado del Ruiz, and El Reventador.
Glacial trimlines, moraines and cirques on Parinacota document multiple glaciations during late Pleistocene events correlated with the Last Glacial Maximum and regional advances recorded on Sajama and Illimani. Summit glaciers once fed valley glaciers that left lateral moraines visible from Lake Chungará and the Altiplano; remnants persist as rock glaciers and perennial snowfields similar to those on Licancabur and Ojos del Salado. Flank geomorphology includes hummocky terrain from a sector collapse, alluvial fans tied to Río Lauca catchments, and volcaniclandforms comparable to those at Llullaillaco and San Pedro de Tatara. Paleolimnological records from Lake Chungará and nearby closed basins capture ashfall layers and sediment pulses linked to Parinacota activity.
Parinacota occupies puna and high Andean biomes with vegetation communities shared with Sajama National Park, including Polylepis woodlands at lower elevations and cushion plants, Yareta, and puna grasses where moisture from the Bolivian winter allows growth. Fauna in the area includes Andean condor, vicuña, llama, alpaca, Andean fox, and high-altitude waterbirds near Lake Chungará such as James's flamingo and Andean gull. Climatic influences combine the dry Atacama Desert regime, diurnal temperature ranges, and seasonal precipitation from the South American monsoon, making Parinacota sensitive to cryospheric changes observed on Sajama and Nevado Sajama.
The volcano and neighboring landscapes form part of Aymara and pre-Columbian cultural spheres, with archeological sites and ritual offerings on high summits akin to discoveries on Llullaillaco, Ampato, and Sajama where mummified human remains and ceremonial artifacts have been found. Colonial and republican-era records reference Parinacota in Spanish Empire mapping and in nineteenth-century explorations by Claude Gay and Charles Darwin-era naturalists, later noted by geographers such as Luis Risopatrón. Contemporary communities maintain pastoralism, traditional festivals and pilgrimage practices that integrate the volcano into local identity and tourism centered on Lake Chungará, the town of Putre, and regional parks.
Scientific investigation of Parinacota spans volcanology, glaciology, geochronology and ecology with field campaigns by institutions including the Universidad de Chile, Universidad Católica del Norte, Servicio Nacional de Geología y Minería (SERNAGEOMIN), Servicio Nacional de Áreas Protegidas (SERNAP), and international teams from Smithsonian Institution, Instituto Geofísico del Perú collaborations, and European research groups. Methods applied include radiocarbon dating, argon–argon geochronology, geochemical analysis, remote sensing with Landsat, ASTER, and Sentinel satellites, and seismic and deformation monitoring analogous to networks used at Villarrica and Lascar. Ongoing monitoring efforts coordinate regional hazard assessment with civil defense agencies such as ONEMI and academic partners, while paleoenvironmental studies use records from Lake Chungará and glacial deposits to reconstruct Holocene climate variations.
Category:Stratovolcanoes of the Andes Category:Volcanoes of Chile Category:Volcanoes of Bolivia