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]
| Malvinas Basin | |
|---|---|
| Cuenca de Malvinas | |
  | |
| Coordinates | 51°30′S 63°30′W / 51.500°S 63.500°W |
| Etymology | Islas Malvinas |
| Location | Argentine Shelf, Southern Atlantic |
| Region | Patagonia |
| Country |  Argentina United Kingdom |
| State(s) | Santa Cruz Province Falkland Islands |
| Characteristics | |
| On/Offshore | Offshore |
| Boundaries | Río Chico-Dungeness High (W) Scotia-South American plate boundary (S) |
| Part of | Circum-Atlantic basins |
| Area | ~180,000 km2 (69,000 sq mi) |
| Hydrology | |
| Sea(s) | Southern Atlantic Ocean |
| Geology | |
| Basin type | Rift basin |
| Orogeny | Break-up of Pangea |
| Age | Early Jurassic-Holocene |
| Stratigraphy | Stratigraphy |
| Field(s) | non-commercial |
Tectonic history
editThe Malvinas Basin started to form with the break-up of Pangea since the Early Jurassic.
Stratigraphy
editThough 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]
| Age | Formation | Lithologies |
|---|---|---|
| Neogene | undefined | Claystones and sandstones |
| Paleogene | Arenas Glauconíticas & Magallaniano Formations | Sandstones and claystones |
| Late Cretaceous | Margas Verdes & Arroyo Alfa Formations | Claystones and sandstones |
| Early Cretaceous | Springhill & Pampa Rincón Formations | Claystones and sandstones |
| Late Jurassic | ||
| Middle Jurassic | Tobífera Formation | Volcanics and claystones |
| Early Jurassic | Hiatus | |
| Paleozoic | Basement | Quartzites and shales |
See also
editReferences
editBibliography
edit- 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