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| Argentina Basin | |
|---|---|
| Name | Argentina Basin |
| Location | South Atlantic Ocean |
| Coordinates | 36°S 52°W |
| Type | Oceanic basin |
| Part of | South Atlantic Ocean |
| Basin country | Argentina |
| Area | ~1,000,000 km² |
| Depth | ~5,000 m (max ~6,000 m) |
Argentina Basin is a major deep-sea depression in the South Atlantic Ocean off the coast of Argentina and east of the South American Plate. The basin lies between prominent bathymetric features such as the Mid-Atlantic Ridge, the Río de la Plata continental margin, and the Walvis Ridge system. It is a focal area for studies by institutions like the Comisión Nacional de Actividades Espaciales (CONAE), the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and international programs including SCOR and GEOTRACES.
The basin occupies a segment of the southwestern South Atlantic Ocean bounded westward by the continental slope of Argentina and eastward by abyssal plains approaching the Mid-Atlantic Ridge. Key neighboring features include the Río de la Plata, the Patagonian Shelf, the Falkland Islands (Islas Malvinas), and the South Sandwich Trench farther to the east. Proximity to ports and cities such as Buenos Aires, Mar del Plata, and Ushuaia influences logistical access for research vessels from institutions like the Servicio de Hidrografía Naval and the United States National Oceanic and Atmospheric Administration. Shipping lanes connecting São Paulo and Montevideo traverse sectors adjacent to the basin, intersecting fisheries managed under the Commission for the Conservation of Antarctic Marine Living Resources.
The basin formed as part of the Mesozoic rifting associated with the breakup of Gondwana and seafloor spreading along the Mid-Atlantic Ridge, linked to the motion of the South American Plate and the African Plate. Its architecture includes thick sedimentary sequences derived from the Patagonian and La Plata Basin hinterlands, turbidite systems, and salt tectonics related to Goiás–Paraná-Etendeka magmatism. Significant geologic processes recorded in the basin involve continental margin subsidence, mass-wasting events comparable to deposits studied off Newfoundland, and paleoceanographic signals tied to Cenozoic climatic shifts and the closure/opening of gateways such as the Drake Passage. Seismic surveys by research groups from British Antarctic Survey and National Oceanography Centre have imaged fault systems, sediment drifts, and buried channels, informing petroleum geologists from companies like YPF and consortiums that operated under licenses negotiated with the Argentine Ministry of Energy.
Circulation in the basin is controlled by the confluence of the Antarctic Circumpolar Current branches, the northward-flowing Benguela Current influences, and the eastward South Atlantic Current meanders. Water mass properties reflect contributions from Antarctic Intermediate Water, North Atlantic Deep Water, and locally modified Shelf Water outflows. Researchers from Woods Hole Oceanographic Institution and Scripps Institution of Oceanography have documented thermohaline variability, abyssal mixing, and benthic oxygen minima modulated by climate modes such as the El Niño–Southern Oscillation and the Southern Annular Mode. Biogeochemical campaigns under programs like GO-SHIP and CLIVAR have measured nutrient distributions, carbon sequestration pathways, and trace metal fluxes relevant to GEOTRACES baselines.
The basin's pelagic and benthic ecosystems include deep-sea fauna studied by expeditions from the National Institute of Water and Atmospheric Research and the Museo Nacional de Historia Natural (Uruguay). Abyssal plains host organisms such as holothurians, echinoids, and demersal fishes linked to taxa catalogued in collections at the Smithsonian Institution and the Museo Argentino de Ciencias Naturales Bernardino Rivadavia. Surface productivity over the basin is influenced by upwelling along the Patagonian Shelf and the Benguela Upwelling, supporting commercially important species managed under the Argentine Fisheries Secretariat and regional bodies including the South Atlantic Fisheries Commission. Deep-sea habitats are affected by climate-driven shifts noted in assessments by the Intergovernmental Panel on Climate Change and biodiversity syntheses by the International Union for Conservation of Nature.
Scientific cruises by platforms such as ARA Puerto Deseado and international vessels from the RV Investigator program have conducted multidisciplinary studies encompassing geology, chemistry, and biology. Exploration efforts include seismic reflection and coring by teams from CONICET, Universidad de Buenos Aires, and the British Geological Survey. Fisheries targeting species like Merluccius hubbsi and Illex argentinus operate on productive margins adjacent to the basin, regulated through measures negotiated with organizations such as the Food and Agriculture Organization and regional accords like the South Atlantic Fisheries Commission. Hydrocarbon exploration has attracted interest from operators including TotalEnergies and ExxonMobil in collaboration with YPF, while environmental monitoring involves agencies like the Secretaría de Ambiente y Desarrollo Sustentable.
The basin lies within areas of economic interest for Argentina's exclusive economic zone concepts and continental shelf claims submitted under the United Nations Convention on the Law of the Sea. Its strategic position affects maritime zones near the Falkland Islands (Islas Malvinas) and intersects with shipping routes vital to trade with Brazil, Uruguay, and South Africa. Natural resource potential—fisheries, hydrocarbons, and deep-sea minerals—has prompted multinational engagement by corporations such as Shell plc and state entities like Petrobras, and has been part of diplomatic dialogue involving the European Union, United States, and regional forums like the Union of South American Nations. Conservation and sustainable use debates reference frameworks from the Convention on Biological Diversity and assessments by the International Seabed Authority.
Category:Oceanic basins Category:South Atlantic Ocean