Puna de Atacama

Puna de Atacama
Name	Puna de Atacama
Settlement type	Plateau
Subdivision type	Countries
Subdivision name	Argentina, Chile
Subdivision type1	Provinces/Regions
Subdivision name1	Salta Province, Catamarca Province, Antofagasta Region
Elevation m	3500–4600
Population total	Sparse

Puna de Atacama is an extensive high plateau in the central Andes straddling the border between Argentina and Chile, lying east of the Atacama Desert and west of the eastern Andean cordillera. The region sits within the broader Altiplano and Central Volcanic Zone and includes numerous salt flats, volcanoes, and endorheic basins that connect to landscapes influenced by Bolivia and Peru. Its remote high-elevation terrain has been the focus of studies by institutions such as the Smithsonian Institution, Geological Society of America, and national geological surveys of Argentina and Chile.

Geography and Geology

The plateau occupies parts of Salta Province, Catamarca Province, and Antofagasta Region and is bounded by the Western Cordillera of the Andes, the Cordillera de Domeyko, the Salar de Atacama, and the eastern valleys draining toward the Rio Colorado. Major volcanic edifices include Licancabur, Llullaillaco, Ollagüe, Socompa, and Cerro Toco; tectonic context involves the subduction of the Nazca Plate beneath the South American Plate and the influence of the Altiplano-Puna magma body. Sedimentary features include the Salar de Pocitos, Salar de Antofalla, Salar de Arizaro, and paleolakes studied in relation to the Lake Minchin complex and the Lake Tauca highstand. Geological mapping has been advanced by researchers affiliated with CONICET, Servicio Nacional de Geología y Minería (SERNAGEOMIN), and universities such as the University of Buenos Aires and the University of Chile.

Climate and Hydrology

The Puna exhibits an alpine climate influenced by the South Pacific High, the Intertropical Convergence Zone, the Humboldt Current, and seasonal shifts in the South American Summer Monsoon. Precipitation is highly seasonal with summer convective storms producing localized runoff into endorheic basins like Salar de Pocitos and Laguna Diamante, while winter radiative cooling leads to intense diurnal temperature ranges recorded by meteorological stations of Servicio Meteorológico Nacional (Argentina) and Dirección Meteorológica de Chile. Hydrological features include closed basins, hypersaline playas, ephemeral streams feeding rio Salado tributaries, and groundwater systems exploited by mining interests and studied by groups such as the International Association of Hydrogeologists.

Flora and Fauna

Vegetation is dominated by high Andean steppe communities including tola shrubs, yareta cushions, and ichu grasses supporting camelid populations like vicuña, guanaco, and feral llama herds introduced during colonial times linked to routes documented by Jesuit missions. Avifauna includes specialist species such as the Andean flamingo, James's flamingo, Andean condor, Giant coot, Puna ibis, and migratory links studied by ornithologists from the American Ornithological Society and the Royal Society for the Protection of Birds. Herpetofauna and invertebrates adapted to hypoxia include members recorded by expeditions from the Field Museum of Natural History and the American Museum of Natural History, while paleontological finds have been examined by teams from the Natural History Museum, London.

Human History and Indigenous Peoples

Archaeological evidence documents pre-Columbian occupation by cultures associated with the Tiwanaku sphere, Inca Empire trade routes, and local hunter-gatherer groups connected to sites excavated by researchers at the Instituto Nacional de Antropología y Pensamiento Latinoamericano (INAPL), the Pontifical Catholic University of Chile, and the National University of Salta. Colonial-era documents from the Viceroyalty of the Río de la Plata and administrative records of the Spanish Empire describe mule caravan routes linking to Potosí and colonial mining centers. Contemporary indigenous communities include Atacameño (Likan Antai) and Quechua-speaking populations engaged with cultural institutions such as the Comunidad Atacameña de Toconao and advocacy groups interacting with governments of Argentina and Chile and international bodies like the United Nations Permanent Forum on Indigenous Issues.

Economy and Natural Resources

Economic activities center on mining, pastoralism, and increasingly on scientific tourism. The plateau hosts deposits of lithium in brines beneath salt flats such as those targeted by companies including Sociedad Química y Minera (SQM), Albemarle Corporation, and regional mining firms regulated by Comisión Chilena del Cobre (Cochilco) and Ministerio de Minería (Argentina). Other resources include copper in porphyry systems, silver veins exploited since colonial times, and industrial salts harvested from playas; exploration involves multinational corporations, national ministries, and institutions like the International Mining and Resources Conference (IMARC). Pastoral economies rely on alpaca and llama herding managed by local cooperatives, while archaeological and astronomical tourism linked to observatories such as Cerro Tololo Inter-American Observatory and ALMA fosters international research partnerships including with European Southern Observatory (ESO) and the National Aeronautics and Space Administration (NASA).

Conservation and Protected Areas

Conservation efforts intersect with protected areas such as the Los Flamencos National Reserve, Salar de Antofalla proposals, and provincial reserves administered by Salta Province and Catamarca Province, as well as Chilean protected zones under the Corporación Nacional Forestal (CONAF). International conservation organizations including World Wildlife Fund, BirdLife International, and UNESCO have collaborated with local governments and universities to address threats from mining, overgrazing, invasive species, and climate change examined in reports by the Intergovernmental Panel on Climate Change (IPCC). Community-led conservation initiatives involve indigenous federations, municipal governments, and research institutions such as CEQUA and CONICET.

Category:Plateaus of Argentina Category:Plateaus of Chile Category:Altiplano