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| Geology of Argentina | |
|---|---|
| Name | Argentina |
| Continent | South America |
| Coords | 34°36′S 58°26′W |
| Area km2 | 2780400 |
| Capital | Buenos Aires |
| Highest point | Aconcagua |
Geology of Argentina
Argentina's geology records a complex interplay among continental growth, plate convergence, magmatism, and sedimentation that shaped the Andes, Patagonia, and the Pampas. Tectonic episodes tied to the Gondwana assembly and breakup, the Andean orogeny, and Cenozoic plate reorganization produced diverse lithologies and economic deposits across provinces such as Mendoza Province, San Juan Province, Santa Cruz Province, and Neuquén Province. Research institutions including the Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, and the Servicio Geológico Minero Argentino have mapped stratigraphy, resources, and hazards.
Argentina occupies part of the western margin of South America and preserves Paleozoic to Cenozoic records related to the Gondwanan supercontinent, the Falkland Islands microplate motions, and the long-lived subduction of the Nazca Plate beneath the South American Plate. The country's physiography spans the high Andes, the foreland Sierras Pampeanas, the Paraná craton-influenced Mesopotamia lowlands, and the Patagonian fold-and-thrust belt. Major structural provinces include the Northwestern Argentina basement highs, the Neuquén Basin, and the Austral Basin, each influenced by events such as the Permian glaciation, the Triassic rifting of Pangea, and the Neogene uplift tied to Andean uplift episodes.
Stratigraphic architecture records platform carbonates, evaporites, siliciclastics, and foreland fill in basins like the Neuquén Basin, the Golfo San Jorge Basin, and the Chubut Basin. Sedimentation sequences display links to global events such as the Permian–Triassic extinction event and the Cretaceous' marine transgressions that deposited the Bajo de la Carpa Formation and the Chorrillo Formation equivalents. Hydrocarbon-bearing units include the Vaca Muerta Formation shales of the Neuquén Basin and the Jurassic to Cretaceous sandstones of the Golfo San Jorge Basin, with stratigraphic correlations to basins in Chile, Bolivia, and Uruguay.
The Precambrian to early Paleozoic basement comprises metamorphic and igneous terranes such as the Rio de la Plata Craton, the Arequipa–Antofalla block, and the Pampean and Famatinian belts. Neoproterozoic to Cambrian orogenies produced high-grade gneiss and granitoid assemblages exposed in the Sierras Pampeanas and Cuyania terrane, with magmatism related to the Famatinian orogeny. Paleozoic sedimentary successions record marine incursions and the Karoo-type foreland deposits, with Permian glacial deposits correlated with coeval strata in South Africa and Australia.
Mesozoic rifting associated with the breakup of Pangea generated extensional basins, flood basalts, and strike-slip reactivation across western Argentina, including the emplacement of the Choiyoi Group and the development of the Neuquén rift system. The onset and intensification of the Andean orogeny during the Late Cretaceous to Paleogene produced crustal shortening, thickening, and voluminous calc-alkaline magmatism expressed in the Cordillera Frontal and the Principal Cordillera. Volcanic centers and batholiths link to plate interactions documented for the Nazca Plate and ancient spreading centers such as the Farallon Plate remnants.
Cenozoic evolution includes Neogene uplift of the Andes, foreland basin propagation, and Antarctic-related paleoclimate influences that controlled sediment flux into the Paraná and Austral basins. Quaternary glaciations sculpted the Patagonian landscape, forming moraines, fjords, and loess deposits across Tierra del Fuego and the Southern Patagonian Ice Field. Active volcanism along the Andean arc produced stratovolcanoes such as Llullaillaco, Copahue, and Domuyo, while basin inversion reactivated earlier structures in the Sierras Pampeanas, impacting hydrocarbon maturation and placer deposition.
Argentina hosts diverse mineral deposits: porphyry copper and epithermal gold in the Andean Cordillera near San Juan Province and Catamarca Province; world-class lithium brine resources in the Puna de Atacama salars such as Salar del Hombre Muerto and Salar de Olaroz; and significant lead, zinc, and silver in the western Cordillera. The Neuquén Basin's unconventional shale gas and oil in the Vaca Muerta play are central to national energy strategies, while metallogenic belts are compared with provinces in Peru and Chile. Mining projects involve companies and regulators operating under frameworks influenced by provincial jurisdictions like Mendoza Province and national agencies including the Secretaría de Minería.
Seismicity driven by the Nazca Plate subduction produces major earthquakes impacting cities such as San Juan and Mendoza, with historical events recorded alongside volcanic eruptions from the Southern Volcanic Zone. Landslides, glacial retreat, and mass wasting affect Patagonian valleys and Andean slopes, while groundwater salinization and brine extraction in salars raise environmental concerns for ecosystems tied to wetlands like Laguna Mar Chiquita and coastal systems such as the Bahía Blanca. Monitoring and hazard mitigation involve institutions including the Instituto Nacional de Prevención Sísmica and the Servicio Meteorológico Nacional.
Category:Geology by country Category:Geography of Argentina