Malvinas Basin

Malvinas Basin
Cuenca de Malvinas
Malvinas Basin is located in Argentina
Malvinas Basin
Location within Argentina
Coordinates51°30′S 63°30′W / 51.500°S 63.500°W / -51.500; -63.500
EtymologyIslas Malvinas
LocationArgentine Shelf, Southern Atlantic
RegionPatagonia
Country Argentina
 United Kingdom
StatesSanta Cruz Province
Falkland Islands
Characteristics
On/OffshoreOffshore
BoundariesRío Chico-Dungeness High (W)
Scotia-South American plate boundary (S)
Part ofCircum-Atlantic basins
Area~180,000 km2 (69,000 sq mi)
Hydrology
SeaSouthern Atlantic Ocean
Geology
Basin typeRift basin
OrogenyBreak-up of Pangea
AgeEarly Jurassic-Holocene
StratigraphyStratigraphy
Fieldnon-commercial

The Malvinas Basin (Spanish: Cuenca de Malvinas) is a major sedimentary basin in the Argentine Shelf offshore southern Patagonia. The basin borders to the west with the Río Chico-Dungeness High that separates it from the Magallanes Basin.[1] The southern boundary is formed by the Scotia plate boundary.[2] Contrary to the neighbouring North Falkland and Magallanes Basins, the Malvinas Basin is not known to have commercial hydrocarbon reserves.[3]

Tectonic history

The Malvinas Basin started to form with the break-up of Pangea since the Early Jurassic.

Stratigraphy

Though poorly understood due to the lack of well data, several formations were identified in the basin on the basis of 2D seismic, of which some also crop out in onshore Patagonia and the Austral Basin:[4]

AgeFormationLithologies
NeogeneundefinedClaystones and sandstones
PaleogeneArenas Glauconíticas & Magallaniano FormationsSandstones and claystones
Late CretaceousMargas Verdes & Arroyo Alfa FormationsClaystones and sandstones
Early CretaceousSpringhill & Pampa Rincón FormationsClaystones and sandstones
Late Jurassic
Middle JurassicTobífera FormationVolcanics and claystones
Early JurassicHiatus
PaleozoicBasementQuartzites and shales

See also

References

  1. ↑ Gallardo, 2014, p.51
  2. ↑ Foschi & Cartwright, s.a., p.42
  3. ↑ Baristeas et al., 2013
  4. ↑ Foschi & Cartwright, s.a., p.44

Bibliography

  • Baristeas, N.; Anka, Z.; di Primio, R.; Rodríguez, J.F.; Marchal, D.; Dominguez, F. (2013), "New insights into the tectono-stratigraphic evolution of the Malvinas Basin, offshore of the southernmost Argentinean continental margin", Tectonophysics, 604: 280–295, Bibcode:2013Tectp.604..280B, doi:10.1016/j.tecto.2013.06.009, retrieved 6 September 2018
  • Foschi, Martino; Cartwright, Joseph Albert (2016), "South Malvinas/Falkland Basin: hydrocarbon migration and petroleum system", Marine and Petroleum Geology, 77: 124, Bibcode:2016MarPG..77..124F, doi:10.1016/j.marpetgeo.2016.06.002
  • Gallardo, Rocío E (2014), "Seismic sequence stratigraphy of a foreland unit inthe [sic] Magallanes-Austral Basin, Dorado Riquelme Block, Chile: Implications for deep-marine reservoirs" (PDF), Latin American Journal of Sedimentology and Basin Analysis, Asociación Argentina de Sedimentología, 1221: 49–64, retrieved 6 September 2018
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