Chaco Basin

Chaco Basin
Cuenca Chaco, Cuenca Chaco Paranaense
Map showing the location of Chaco Basin
Location of the basin in South America
Coordinates 25°S 60°W / 25°S 60°W / -25; -60Coordinates: 25°S 60°W / 25°S 60°W / -25; -60
Etymology Chaco
Location Central South America
Region Gran Chaco
 Paraná Basin
Country  Argentina
 Bolivia
 Paraguay
State(s) Chaco, Formosa
Chuquisaca, Santa Cruz, Tarija
Alto Paraguay, Boquerón
Cities Filadelfia
Characteristics
On/Offshore Onshore
Boundaries Andes
Part of Andean foreland basins
Hydrology
River(s) Paraguay, Paraná
Geology
Basin type Foreland basin
Orogeny Andean
Age Paleozoic-Holocene
Stratigraphy Stratigraphy

The Chaco Basin (Spanish: Cuenca Chaco, Spanish: Cuenca Chaco Paranaense or Spanish: Cuenca Chaco-Paraná) is a major sedimentary basin in Central South America around the borders of Argentina, Bolivia and Paraguay. The basin forms part of the larger Paraná Basin. Superficially, the Chaco Basin is an alluvial basin composed of land-derived (in contrast to marine sediments) material, mostly fine sand and clays of Paleogene, Neogene and Quaternary age. On deeper levels the Paraguayan Chaco is made up by four sub-basins, the Pirizal, Pilar, Carandaity and Curupaity basins.[1][2]

Stratigraphy

The basin is part of the megaregional Paraná Basin, of which it occupies its western portion. The basin is subdivided into the Western Chaco (Chaco Occidental) and Eastern Chaco (Chaco Oriental). The Paleozoic stratigraphy of the Chaco Basin comprises the Middle to Late Carboniferous Sachayoj Formation, the Late Carboniferous Charata Formation and the Early Permian Chacabuco Formation.[3] The Neogene cover contains the Late Miocene Paraná Formation,[4] the Late Pleistocene (Lujanian in the SALMA classification) Chaco Formation,[5][6] also described as Eocene to Miocene,[7] and the substratum-forming Fortín Tres Pozos Formation in the Formosa Province of northern Argentina.[8][9]

References

  1. ↑ Zhang, Lei (1 September 2018). "Geological Conditions of Tight Gas in Chaco Basin". American Association of Petroleum Geologists. doi:10.15530/URTEC-2014-1921799. Retrieved 1 September 2018.
  2. ↑ "President Energy Finds Oil In Paraguay's Chaco Basin". Exploration & Production. Retrieved 1 September 2018.
  3. ↑ Cuenca Chaco Paranense
  4. ↑ Brea et al., 2013, p.28
  5. ↑ Quebrada Agua Blanca at Fossilworks.org
  6. ↑ Mapa Geológico del Paraguay, 1986, p.42
  7. ↑ Filí, 2001, p.28
  8. ↑ Zurita et al., 2009, p.279
  9. ↑ Soibelzon et al., 2010, p.315

Bibliography

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