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| Plateaus of Chile | |
|---|---|
| Name | Plateaus of Chile |
| Location | Chile |
| Region | Atacama Region, Coquimbo Region, Valparaíso Region, Santiago Metropolitan Region, O'Higgins Region, Maule Region, Ñuble Region, Biobío Region, Araucanía Region, Los Ríos Region, Los Lagos Region, Aysén Region, Magallanes Region |
Plateaus of Chile are elevated, relatively flat to gently undulating landforms distributed along the length of Chile from the Altiplano in the north to steppe and volcanic tablelands in the south. These plateau regions interconnect with the Andes, the Coastal Range, and various basins, shaping hydrology, climate, and human settlement patterns across administrative divisions such as Antofagasta Region, Tarapacá Region, and Arica y Parinacota Region. The plateaus host a range of biomes and resources central to national projects managed by institutions like the Servicio Nacional de Geología y Minería and the Corporación Nacional Forestal.
Plateau zones include the northern Altiplano adjacent to Bolivia, the hyperarid mesas of the Atacama Desert, the intermediate Plateaus of Coquimbo Region and Valparaíso Region, the central Chilean tablelands near the Maipo River and Mapocho River, and the southern volcanic plateaus of Araucanía Region and Los Lagos Region. Notable named plateaus and mesas are the Puna de Atacama, parts of the Altos de Pica, the Precordillera plateaus, and fragmented surfaces such as the Llanquihue Plateau and Palena Province uplands. These surfaces interface with geomorphic features including the Loa River, Copiapó River, Bío Bío River, and major urban centers like Santiago, Antofagasta, Valparaíso, Concepción, and Puerto Montt.
The plateaus result from complex tectonic convergence between the Nazca Plate and the South American Plate, with crustal shortening, uplift, and magmatism producing the Andean orogeny and the high Altiplano-Puna volcanic complex. Volcanic plateaus derive from episodes connected to volcanic systems such as Llaima, Villarrica, Osorno Volcano, Antofagasta de la Sierra, and the Lincancabur region; ignimbrites and lava flows from calderas like La Pacana created extensive ignimbrite sheets. Sedimentary plateaus formed by uplifted marine terraces and Pleistocene fluvial deposits are linked to terraces near Valdivia and Chiloé Island. Structural plateaus owe shapes to thrust belts, fault systems including the Liquiñe-Ofqui Fault, and regional uplift associated with the Subduction of the Nazca Plate. Glacial sculpting from the Last Glacial Maximum overprinted many southern plateaus, producing features seen near Puerto Aysén, Punta Arenas, and the Futaleufú River valley.
Climatic regimes span from hyperarid Atacama Desert conditions in the north to mediterranean climates around Santiago Metropolitan Region, temperate rainforests in Los Lagos Region, and subpolar conditions in Magallanes Region. Vegetation zones include Tamarugo groves in the north, Matorral scrub around Coquimbo Region, the Valdivian temperate rainforests of Los Ríos Region, and Nothofagus forests in Aysén Region. Faunal assemblages involve species such as the vicuña on the Altiplano, the Huemul in southern Andes-adjacent plateaus, and avifauna like the Andean condor, Humboldt penguin along adjacent coasts, and migratory birds using plateau wetlands. Microclimates on mesas influence Andean camelids grazing, ephemeral wetlands (bofedales), and endemic flora recorded by botanists at institutions like the Museo Nacional de Historia Natural (Chile).
Human presence spans pre-Columbian societies—Atacameños (Likan Antai), Diaguita, Mapuche—to colonial and republican eras with settlements such as San Pedro de Atacama, La Serena, Valparaíso, and Punta Arenas. Plateaus support pastoralism tied to sheep farming in Magallanes Region, camelid herding on the Altiplano, and irrigated agriculture in oases like Tiltil fed by rivers such as the Elqui River. Transit corridors across plateaus include historical routes like the Camino del Inca alignments, modern infrastructure corridors such as the Pan-American Highway and the Ferrocarril de Antofagasta a Bolivia. Cultural heritage comprises petroglyphs at Atacama, archaeological sites catalogued by the Comisión Nacional de Monumentos Históricos, and intangible practices preserved by indigenous communities.
Plateaus are focal zones for extractive industries including large-scale mining of copper (operations like Escondida, Chuquicamata proximate to plateau margins), lithium brine extraction in the Salar de Atacama, and mining of nitrates historically at sites such as Pampa del Tamarugal. Hydropower projects exploit plateau runoff in basins feeding dams like those on the Bío Bío River and Maule River, while geothermal potential is explored near volcanic complexes managed by companies and agencies including the Comisión Chilena del Cobre and the Comisión Nacional de Energía. Forestry plantations of Pinus radiata and Eucalyptus globulus occur on plateau fringes, supporting pulp and paper mills in Valdivia and Osorno. Tourism industries leverage plateau attractions: stargazing at observatories like Paranal Observatory and ALMA, skiing near Ski Portillo, and ecotourism in parks such as Lauca National Park and Conguillío National Park.
Conservation challenges include water scarcity in the Atacama, contamination from mining near Río Loa and Salar de Atacama, deforestation on plateau margins affecting Mapuche territories, and biodiversity loss in the Valdivian temperate rainforests. Protected areas administered by CONAF—examples include Pan de Azúcar National Park and Huerquehue National Park—aim to conserve plateau ecosystems while balancing extractive pressures from companies like Codelco and multinational firms. Climate change impacts project glacier retreat in the Andes, altered precipitation patterns affecting bofedales and agricultural yields studied by Universidad de Chile and Pontifical Catholic University of Chile. Social-environmental conflicts arise over water rights adjudicated under the Water Code, indigenous land claims pursued through the Indigenous Law and organizations such as the Consejo de Todas las Tierras. Integrated landscape management initiatives involve international partners like the Inter-American Development Bank and research networks including the International Centre for Integrated Mountain Development.
Category:Geography of Chile