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| Puna-Altiplano plateau | |
|---|---|
| Name | Puna-Altiplano plateau |
| Other names | Altiplano, Andean Plateau, Puna |
| Location | Andes, South America |
| Countries | Bolivia, Peru, Chile, Argentina |
| Length km | 1500 |
| Elevation m | 3200–4300 |
| Geology | Volcanic arc, continental collision |
Puna-Altiplano plateau The Puna-Altiplano plateau is a high-elevation Andes plateau spanning parts of Bolivia, Peru, Chile, and Argentina and forming a major component of the South American topography alongside the Tibetan Plateau and Colorado Plateau. The region includes the Altiplano, the central Puna, and adjoining basins such as the Salar de Uyuni and the Llanos de Challe, and lies between volcanic chains like the Cordillera Occidental and the Cordillera Real. Major urban and cultural centers in and near the plateau include La Paz, Potosí, Cusco, and Jujuy, which connect the plateau to colonial histories like the Viceroyalty of Peru and modern states such as the Plurinational State of Bolivia.
The plateau extends roughly from the southern Peruvian Altiplano through the Bolivian Altiplano into northern Argentina and northern Chile, bounded by the Cordillera Occidental (Andes) to the west and the Cordillera Oriental (Bolivia) to the east, and encompassing major basins including the Salar de Uyuni, Salar de Coipasa, and the Lake Titicaca basin. It links physiographically to neighboring regions such as the Puna de Atacama, the Atacama Desert, and the southern Andean Volcanic Belt, and interacts with altitudinal zones recognized in studies by institutions like the Smithsonian Institution, Instituto Geográfico Militar (Bolivia), and the Servicio Nacional de Meteorología e Hidrología (SENAMHI). Administrative divisions overlapping the plateau include Potosí Department, La Paz Department (Bolivia), Jujuy Province, and Puno Region.
The plateau originated through processes linked to the westward subduction of the Nazca Plate beneath the South American Plate, Neogene crustal shortening, and uplift associated with the Andean orogeny, producing ignimbrites, stratovolcanoes, and thrust belts studied by research groups from University of Buenos Aires, Universidad Mayor de San Andrés, and the U.S. Geological Survey. Volcanic centers such as Licancabur, Sajama, and the Tunupa complex record interactions of the Central Volcanic Zone and crustal magmatism, while basin formation preserved evaporites exemplified by the Salar de Uyuni and clastic sequences tied to the Paleozoic and Mesozoic histories of the region. Tectonic features like the Altiplano-Puna Magma Body and faults including the Incaic Fault system influence seismicity monitored by networks such as the Observatorio San Calixto and geophysical campaigns funded by agencies like the National Science Foundation.
The plateau exhibits a high‑altitude cold, semi-arid to arid climate influenced by the South American summer monsoon, the Humboldt Current, and the Intertropical Convergence Zone, producing marked seasonality across areas monitored by SENAMHI, Servicio Nacional de Meteorología e Hidrología (Chile), and university climatology departments. Hydrological features include the endorheic basins of Lake Titicaca, Salar de Coipasa, and Salar de Uyuni, meltwater-fed rivers sourced from glaciers on peaks like Illimani and Illampu, and wetlands such as the Bofedales that connect to migratory flyways documented by organizations like BirdLife International and the International Union for Conservation of Nature. Paleoclimate records retrieved from lacustrine deposits and ice cores relate to events like the Last Glacial Maximum and Holocene humidity fluctuations studied by teams from the Max Planck Institute for Chemistry and Lund University.
Vegetation and fauna on the plateau reflect Andean endemism and biogeographic links to the Neotropical realm and the Nearctic at high elevations, with plant communities including Polylepis woodlands, puna grasslands, and cushion plants supporting mammals like the vicuña, guanaco, and Andean fox, and birds such as the Andean condor, James's flamingo, and Andean goose. The plateau is a center for endemic amphibians and reptiles recorded in inventories by the American Museum of Natural History and hosts wetlands of international importance designated under the Ramsar Convention and protected areas like the Sajama National Park, Eduardo Avaroa Andean Fauna National Reserve, and Titicaca National Reserve. Biogeographic studies cite corridors connecting the plateau to the Yungas, the Patagonian Steppe, and puna systems addressed in research by the International Union for Conservation of Nature and regional universities.
Human occupation spans from prehistoric hunter-gatherer sites and archeological complexes such as Tiwanaku and Wari to the rise of the Inca Empire and colonial centers like Potosí, integrating cultural landscapes inhabited by Indigenous nations including the Aymara, Quechua, and Atacameño (Likan Antai). Colonial and Republican histories involve extraction economies tied to the Spanish Empire, mining at the Cerro Rico (Potosí), and state actors such as the Republic of Bolivia and Argentine Confederation, while contemporary indigenous movements engage with institutions like the Organization of American States and national legislatures. Archaeological and ethnohistorical research by institutions such as the Smithsonian Institution and Universidad Nacional de San Antonio Abad del Cusco documents terracing, pastoralism, and trade routes linked to the Qhapaq Ñan road system.
The plateau hosts rich mineral deposits including silver from Cerro Rico, lithium concentrated in the Salar de Uyuni and Salar de Atacama, tin and polymetallic ores mined in Potosí and Oruro, and geothermal energy potential along the Central Volcanic Zone exploited in projects by national enterprises and multinational firms. Traditional economies include pastoralism of alpaca and llama, quinoa cultivation tied to export markets involving companies in La Paz and Lima, and artisanal salt extraction practiced in communities across the Andean highlands. Infrastructure and development initiatives by bodies like the Inter-American Development Bank and national ministries influence water allocation and resource governance alongside private mining concessions and conservation zones.
Environmental challenges encompass glacier retreat linked to climate change, water scarcity affecting Lake Titicaca and highland agriculture, biodiversity loss impacting species protected under CITES, and contamination from mine tailings documented in assessments by the World Bank and United Nations Environment Programme. Conservation responses involve protected areas such as Sajama National Park and cross-border initiatives coordinated by organizations like the Convention on Biological Diversity and regional NGOs, while community-based management by Aymara and Quechua municipalities seeks to integrate indigenous knowledge with scientific monitoring from universities and research institutes. Adaptive strategies include ecosystem restoration, sustainable tourism promoted in cities like La Paz and Puno, and policy mechanisms debated in national forums of Bolivia, Peru, Chile, and Argentina.