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| Malvinas/Falklands Plateau | |
|---|---|
| Name | Malvinas/Falklands Plateau |
| Type | Submarine plateau |
| Location | South Atlantic Ocean |
| Coordinates | approx. 50°–55°S, 55°–65°W |
| Area | ~300,000 km² (est.) |
| Depth | typically 200–2000 m |
| Tectonic setting | South American Plate / Scotia Plate margin |
Malvinas/Falklands Plateau is a broad submarine high in the South Atlantic bordering the continental margins of Argentina, Falkland Islands, and the South Atlantic Ocean. The plateau forms a bathymetric high separating the Río de la Plata-influenced shelf to the north from the deeper South Sandwich Trench-influenced basins to the south. It has played a key role in regional paleoclimate reconstructions, hydrocarbon exploration, and biogeographic connectivity between subantarctic and temperate marine provinces.
The plateau lies east of the Patagonia continental shelf and west of the South Georgia and the South Sandwich Islands arc, extending roughly from the San Jorge Gulf latitude toward the Falkland Islands (Islas Malvinas). Bathymetric surveys reveal a mosaic of gently sloping highs, isolated seamounts, and canyons incised by turbidity currents and submarine landslides. Surrounding physiographic features include the Magellan Rise to the south, the Río de la Plata Basin influent shelf to the north, and the North Scotia Ridge to the east. The plateau’s morphology influences mesoscale circulation, eddy formation, and sediment pathways that connect to the Atlantic Meridional Overturning Circulation.
The plateau records a complex geologic evolution tied to the breakup of Gondwana, rifting between the South American Plate and the African Plate, and subsequent spreading along the South Atlantic Ocean ridge system. Seismic reflection, dredge sampling, and borehole data indicate alternating intervals of continental crustal remnants and stretched continental margin sequences overlain by marine sediments. Igneous suites correlate with the Falkland Islands outcrops and with volcanic events related to the South Atlantic Igneous Province. Structural elements include rotated fault blocks, half-grabens, and relict transform features associated with the opening of the South Atlantic Ocean and the formation of the Scotia Plate microplate assemblage.
The plateau intersects major water masses including the Subantarctic Front, the Antarctic Circumpolar Current, and the northern reaches of the Patagonian Shelf Water. Interaction with the plateau topography modifies flow, generating standing meanders, mesoscale eddies, and localized upwelling that affect nutrient fluxes. Seasonal variability links to the Southern Annular Mode and to teleconnections with the El Niño–Southern Oscillation via changes in wind stress and sea-surface temperature. The plateau also modulates pathways for cold Antarctic Intermediate Water and warmer subtropical waters, influencing biogeographic boundaries and the transport of larvae and plankton between the Falkland Current and the Brazil Current systems.
Ecological communities on the plateau range from benthic cold-water sponge and gorgonian assemblages to pelagic communities dominated by krill-analog zooplankton and commercially important fish such as Patagonian toothfish and hake (Merluccius hubbsi). Hard-substrate habitats formed by volcanic outcrops and carbonate-cemented reefs support sessile invertebrates similar to those observed around the Falkland Islands and South Georgia. Migratory megafauna including sperm whale, blue whale, southern elephant seal, and seabirds like albatrosses and petrels use the productivity hotspots generated by plateau upwelling. Biogeographic studies highlight links with the Magellanic Province and with subantarctic assemblages influenced by the Antarctic Polar Front.
The plateau overlies sedimentary basins considered prospective for hydrocarbons; exploration wells and seismic surveys have targeted Cretaceous and Cenozoic source-rock intervals analogous to those exploited on the Patagonian Shelf. Placer deposits and phosphorite occurrences have been reported from surface sediments, and ferromanganese crusts on seamount flanks suggest potential polymetallic resources comparable to those on the Mid-Atlantic Ridge. Fisheries constitute a major living resource, with Falkland Islands and Argentine fleets exploiting demersal and pelagic stocks; management is informed by regional organizations such as the Commission for the Conservation of Antarctic Marine Living Resources and domestic regulatory bodies.
Multidisciplinary surveys by research vessels from institutions including the British Antarctic Survey, CONICET, CSIC (Spain), and universities in United Kingdom, Argentina, and Germany have produced bathymetry, seismic, and biological datasets. Notable campaigns used multibeam echosounders, ROVs, and piston coring to resolve sedimentary records that tie to the Last Glacial Maximum and to Pleistocene sea-level change. Historical charts produced during voyages by James Cook and later by hydrographic services provided early bathymetric hints, while modern satellite altimetry and programs like GEBCO and EMODnet have refined digital elevation models for the plateau.
Fishing pressure, hydrocarbon exploration interests, and proposed seabed mining raise concerns about habitat disturbance, bycatch affecting albatross and petrel populations, and hydrocarbon spill risks that could impact southern right whale and coastal fisheries. Sovereignty disputes between Argentina and the United Kingdom have complicated transboundary management and marine spatial planning. Conservation measures include marine protected area proposals influenced by international frameworks such as the Convention on Biological Diversity and regional fisheries management organizations, while NGOs and academic stakeholders advocate for precautionary approaches to protect benthic habitats and migratory corridors.
Category:Submarine plateaus Category:South Atlantic Ocean