Chaco Basin
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
^ Zhang, Lei (1 September 2018). "Geological Conditions of Tight Gas in Chaco Basin" . Proceedings of the 2nd Unconventional Resources Technology Conference . American Association of Petroleum Geologists. doi :10.15530/URTEC-2014-1921799 . ISBN 978-0-9912144-1-9 . Retrieved 1 September 2018 .
^ "President Energy Finds Oil In Paraguay's Chaco Basin" . Exploration & Production . Retrieved 1 September 2018 .
^ Cuenca Chaco Paranense
^ Brea et al., 2013, p.28
^ Quebrada Agua Blanca at Fossilworks .org
^ Mapa Geológico del Paraguay, 1986, p.42
^ Filí, 2001, p.28
^ Zurita et al., 2009, p.279
^ Soibelzon et al., 2010, p.315
Bibliography
Brea, Mariana; Franco, María Jimena; Zucol, Alejandro F. (2013), "Paleoflora de la Formación Paraná (Mioceno Tardío), Cuenca Chaco-Paranaense, Argentina" (PDF) , El Neógeno de la Mesopotamia argentina, Asociación Paleontológica Argentina, Publicación Especial , 14 : 41–55, retrieved 2018-09-03
Filí, M.F (2001), "Síntesis Geológica e Hidrogeológica del noroeste de la provincia de Entre Ríos - República Argentina" (PDF) , Boletín Geológico y Minero , 112 : 25–36, retrieved 2018-09-03
Soibelzon, Leopoldo Héctor (2010), "Primer registro fósil de Procyon cancrivorus (G. Cuvier, 1798) (Carnivora, Procyonidae) en la Argentina" (PDF) , Revista Mexicana de Ciencias Geológicas , 27 : 313–319, retrieved 2018-09-03
Zurita, Alfredo Eduardo; Miño Boilini, Ángel Ramón; Carlini, Alfredo Armando; Iriondo, Martín; Alcaraz, María Alejandra (2009), "Paleontología del Chaco Oriental. Una nueva localidad con mamíferos fósiles pleistocenos en el río Bermejo (Formosa, Argentina)" (PDF) , Revista Mexicana de Ciencias Geológicas , 26 : 277–288, retrieved 2018-09-03 Archived 2018-09-04 at the Wayback Machine
Various, Authors (1986), Mapa Geológico del Paraguay - Proyecto PAR 86 - Escala 1:1,000,000 - Texto explicativo (PDF) , pp. 1–62, retrieved 2018-09-03
Sedimentary basins of Argentina
Onshore & offshore
Offshore Sources