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Argentinian sedimentary basin
The Colorado Basin (Spanish : Cuenca del Colorado ) is a sedimentary basin located in northeastern Patagonia . The basin stretches across an area of approximately 180,000 square kilometres (69,000 sq mi ), of which 37,000 square kilometres (14,000 sq mi ) onshore in the southern Buenos Aires Province and the easternmost Río Negro Province extending offshore in the South Atlantic Ocean .
The basin comprises a sedimentary succession dating from the Permian (pre-rift stage) and Early Cretaceous (rift stage) to the Quaternary , representing the passive margin tectonic phase of the basin history. The Mesozoic rifting in the basin resulted from the break-up of Pangea and the formation of the South Atlantic. Long hiatuses exist in the succession.
The basin is of paleontological significance for hosting fossiliferous stratigraphic units dating to the Late Miocene . The Arroyo Chasicó Formation defines the Chasicoan South American land mammal age and contains a rich mammal and other vertebrate fauna. The contemporaneous Cerro Azul Formation has provided fossil rodents , armadillos and opossums . The Middle to Late Miocene Gran Bajo del Gualicho Formation contains vertebrate fossils of the cetacean Preaulophyseter gualichensis Río Negro Formation has provided fossils of the glyptodont Plohophorus figuratus flora microfossils .
Contrasting with the South Atlantic passive margin basins to the north (Santos Basin in southern Brazil) and south; Golfo San Jorge and Austral Basins , the Colorado Basin does not produce hydrocarbons. Exploration for petroleum started in the 1940 with the drilling of two onshore wells and several onshore and offshore wells have been drilled in the 1960s, 1970s and 1990s. The main source rocks are found in the Permian succession, with reservoir rocks the Colorado Formation . Seals are provided by the Early Paleocene Pedro Luro Formation .
Description
[ edit ] View of Viedma and Carmen de Patagones, separated by the Río Negro
The Colorado Basin stretches across an approximate area of 180,000 square kilometres (69,000 sq mi ) with about 37,000 square kilometres (14,000 sq mi ) onshore, underlying the southernmost Buenos Aires Province and the southeasternmost Río Negro Province . Cities inside the basin are Bahía Blanca and Carmen de Patagones in Buenos Aires Province and Viedma in Río Negro Province, the earliest founded city in Patagonia . The onshore part of the basin is crossed by the eponymous Colorado and Río Negro rivers. Surrounding the Río Negro, many salt lakes are present in the basin.[1]
Some authors group the basin together with the Claromecó Basin to the north.[2] Salado Basin and the deeper offshore Argentina Basin .[3] [4] mi ).[5]
The Colorado Basin is bound to the north by the Ventania High ,[6] Sierra de la Ventana ,[7] or Sierras Australes ,[2] Rawson ,[8] or Río Negro High .[9] Macachín Basin and the western boundary is formed by the San Rafael Block .[9]
Basin evolution
[ edit ] Pangea in the Permian (~250 Ma). The Colorado Basin experiences glaciations and a marine transgressive phase in the south polar region. Sketch of the paleogeographic situation of South America during the Late Cretaceous and Early Paleogene, roughly 85 to 63 Ma. The Colorado Basin, located north of the North Patagonian Massif in the South Gondwanan Province (grey), is exposed and eroded during the Maastrichtian .
The basin started forming in the Middle to Late Jurassic with the break-up of Pangea and the formation of the Southern Atlantic.[10] Early Cretaceous .[5] Pennsylvanian Lolén Formation of the Ventana Group ,[11] Sauce Grande , Piedra Azul , Bonete and Tunas Formations of the Pillahuincó Group ,[2] Permian .[12] Paleozoic , the Colorado Basin was located in the south polar region, causing a sequence of glacial deposits in the basin. These deposits were mostly sourced from the African basin, the Karoo and Kalahari Basins . The Early Permian sediments are characterized by the presence of diamictites . A transgression in the Permian led to the deposition of the Piedra Azul Formation.[13] Triassic and Early Jurassic , Albian and Paleogene .[14]
The early Mesozoic succession is missing, and the main rifting phase happened in the Barremian and Aptian , around 120 million years ago, represented in the Fortín Formation .[15] Late Cretaceous leading to the deposition of the alluvial and fluvial sediments of the Colorado Formation .[14] Pedro Luro Formation .[14] passive margin setting and comprises the Paleocene Elvira ,[14] Middle Miocene Barranca Final Formation ,[16] Gran Bajo de Gualicho Formation .[17] Río Negro Formation .[18] Arroyo Chasicó and eolian Cerro Azul Formations ,[19] [20] Late Miocene to Early Pliocene eolian and fluvial Río Negro Formation,[21] [22] [1]
Stratigraphy
[ edit ]
Paleontological significance
[ edit ] Neocavia pampeana Cerro Azul Formation
The Miocene formations cropping out onshore have provided a rich mammal fauna. The Arroyo Chasicó Formation is the defining formation for the Late Miocene Chasicoan South American land mammal age , ranging from 10 to 9 million years ago.[25] [26] rodents Chasichimys bonaerense [27] Neocavia pampeana [28] Reigechimys plesiodon R. simplex ,[29] armadillos Chasicotatus ameghinoi [23] Macrochorobates scalabrinii [27] opossum Zygolestes tatei [30] Río Negro Formation has provided fossils of the glyptodont Plohophorus figuratus [31]
The marine Gran Bajo de Gualicho Formation contains many bivalve , gastropod and echinoid fossils,[32] cetacean Preaulophyseter gualichensis [33] dinoflagellates ,[34] pollen were registered.[35]
Petroleum exploration
[ edit ]
Contrary to other Southern Atlantic marginal basins, as the Golfo San Jorge and Austral Basins to the south, and Santos Basin of Brazil to the north, the Colorado Basin is not producing hydrocarbons. The first wells in the northern onshore part of the basin were drilled in 1946 (Pedro Luro-1) and 1948 (Ombucta-1) by YPF . Another phase of onshore exploration happened in the 1960s, with seven wells drilled by Shell .[36] Hunt Oil and after seismic acquisition in the 1970s by YPF,[37] [38] oil shows of 39° API .[39]
See also
[ edit ]
References
[ edit ]
^ a b Geologic Map Hojas 4163-II/IV & I/III, 2006
^ a b c d e f g Balarino, 2012, p.344
^ Pucci, 2006, p.17
^ ENARSA, s.a., p.3
^ a b ENARSA, s.a., p.2
^ Daners et al., 2016, p.285
^ Balarino, 2009, p.20
^ ENARSA, s.a., p.1
^ a b Barredo & Stinco, 2010, p.60
^ Geologic Map Hojas 3963-III & IV, 2009, p.42
^ a b Balarino, 2009, p.24
^ Balarino, 2009, p.22
^ Balarino, 2009, p.23
^ a b c d e f g ENARSA, s.a., p.4
^ a b Barredo & Stinco, 2010, p.52
^ a b Geologic Map Hojas 3963-III & IV, 2009, p.39
^ a b Reichler, 2010, p.192
^ Reichler, 2010, p.183
^ a b Visconti et al., 2010, p.259
^ Geologic Map Hojas 3963-III & IV, 2009, p.5
^ a b Pérez, 2010, p.7
^ a b Geologic Map Hojas 3963-III & IV, 2009, p.8
^ a b Scillato Yané et al., 2010, p.51
^ Zárate et al., 2007
^ Chasicoan at Fossilworks .org
^ Arroyo Chasicó at Fossilworks .org
^ a b Verzi et al., 2008
^ Madozzo Jaén et al., 2018, p.250
^ Sostillo et al., 2014
^ Goin et al., 2000, p.108
^ Punta Bermeja at Fossilworks .org
^ Reichler, 2010, pp.191-192
^ Buono, 2013, p.36
^ Daners et al., 2016, p.293
^ Balarino, 2012, p.343
^ Rossello, 2016, p.175
^ ENARSA, s.a., p.8
^ ENARSA, s.a., p.5
^ Pucci, 2006, p.18
Bibliography
[ edit ]
General
Balarino, M. Lucía (2012), "Palinología del Pérmico de la Cuenca Claromecó-Colorado, Argentina" , Ameghiniana 49 3 ): 343–364, doi :10.5710/AMGH.v49i3(462) , hdl :11336/97930 , retrieved 2019-03-06
Balarino, M. Lucía (2009), Palinoestratigrafía del Paleozoico Superior de la Cuenca Colorado, República Argentina, y su correlación con áreas relacionadas (PhD thesis) , Universidad Nacional de La Plata , pp. 1–566
Barredo, Silvia P.; Stinco, Luis P. (2010), "Geodinámica de las cuencas sedimentarias: su importancia en la localización de sistemas petroleros en la Argentina" (PDF) , Petrotecnia , retrieved 2019-03-06
Daners, Gloria; Guerstein, G. Raquel; Amenábar, Cecilia R.; Morales, Ethel (2016), "Dinoflagelados del Eoceno Medio a Superior de las Cuencas Punta del Este y Colorado, latitudes medias del Atlántico Sudoccidental" (PDF) , Revista Brasileira de Paleontologia 19 2 ): 283–302, doi :10.4072/rbp.2016.2.11 , retrieved 2019-03-06
ENARSA, Geología de la Cuenca del Colorado (PDF) , Energía Argentina S.A, pp. 1–13, retrieved 2019-03-06
Pucci, Juan Carlos (2006), "Situación de las cuencas marinas de la República Argentina" (PDF) , Petrotecnia , retrieved 2019-03-06
Rossello, Eduardo A (2016), Tectosedimentary characterization of the oil producer basins in Argentina (PDF) , GFZ Potsdam , pp. 1–192, retrieved 2019-03-06
Geologic maps
Etcheverría, Mariela P.; Folguera, Alicia; Miranda, Fernando; Faroux, Abel J.; Getino, Pablo R.; Dalponte, Marcelo Raúl (2009), Hojas Geológicas 3963-III y IV Colonia Juliá y Echarren y Pedro Luro (PDF) , SEGEMAR , pp. 1–61, retrieved 2019-03-06
Etcheverría, Mariela P.; Folguera, Alicia; Dal Molin, Carlos Nelson; Dalponte, Marcelo Raúl; Ferro, Georgina; Franchi, Mario (2006), Hojas Geológicas 4163 - II/IV y I/III Viedma y General Conesa (PDF) , SEGEMAR , p. 1 , retrieved 2019-03-06
Arroyo Chasicó Formation
González Ruiz, Laureano R.; Scillato Yané, Gustavo J.; Krmpotic, Cecilia M.; Carlini, Alfredo A. (2012), "A new species of Peltephilidae (Mammalia: Xenarthra: Cingulata) from the late Miocene (Chasicoan SALMA) of Argentina" (PDF) , Zootaxa 3359 : 55–64, retrieved 2019-02-15
Pérez, María Encarnación; Deschamps, Cecilia M.; Vucetich, María Guiomar (2018), "Diversity, phylogeny and biogeography of the South American 'cardiomyine' rodents (Hystricognathi, Cavioidea) with a description of two new species" , Papers in Palaeontology 4 1 ): 1–19, Bibcode :2018PPal....4....1P , doi :10.1002/spp2.1095 , hdl :11336/42361 , retrieved 2019-02-12
Rasia, Luciano L.; Candela, Adriana M. (2016), "Lagostomus telenkechanum , sp. nov., a new lagostomine rodent (Caviomorpha, Chinchillidae) from the Arroyo Chasicó Formation (late Miocene; Buenos Aires Province, Argentina)" , Journal of Vertebrate Paleontology 37 1 ): e1239205, doi :10.1080/02724634.2017.1239205 , hdl :11336/72389 , retrieved 2019-02-12
Zárate, Marcelo A.; Schultz, Peter H.; Blasi, Adriana; Heil, Clifford; King, John; Hames, Willis (2007), "Geology and geochronology of type Chasicoan (late Miocene) mammal-bearing deposits of Buenos Aires (Argentina)" , Journal of South American Earth Sciences 23 1 ): 81–90, Bibcode :2007JSAES..23...81Z , doi :10.1016/j.jsames.2006.09.018 , retrieved 2019-03-06
Cerro Azul Formation
Goin, F.J.; Montalvo, C.; Visconti, G. (2000), "Los marsupiales (Mammalia) del Mioceno superior de la Formación Cerro Azul (Provincia de La Pampa, Argentina)" , Estudios Geológicos 56 doi :10.3989/egeol.00561-2158 , hdl :11336/108700 , retrieved 2017-08-15
Madozzo Jaén, M. Carolina; Pérez, M. Encarnación; Montalvo, Claudia I.; Tomassini, Rodrigo L. (2018), "Systematic review of Neocavia from the Neogene of Argentina: Phylogenetic and evolutionary implications" (PDF) , Acta Palaeontologica Polonica 63 , retrieved 2019-03-08
Scillato Yané, Gustavo Juan; Krmpotic, Cecilia Mariana; Esteban, Graciela Irene (2010), "The species of genus Chasicotatus Scillato-Yané (Eutatini, Dasypodidae)" (PDF) , Revista Mexicana de Ciencias Geológicas 27 , retrieved 2019-03-08
Sostillo, Renata; Montalvo, Claudia I.; Verzi, Diego H. (2014), "A new species of Reigechimys (Rodentia, Echimyidae) from the Late Miocene of central Argentina and the evolutionary pattern of the lineage" , Ameghiniana 51 4 ): 284–294, doi :10.5710/AMGH.24.04.2014.2741 , retrieved 2019-02-12
Verzi, D.H.; Montalvo, C.I.; Deschamps, C.M. (2008), "Biostratigraphy and biochronology of the Late Miocene of central Argentina: Evidence from rodents and taphonomy" , Geobios 41 Bibcode :2008Geobi..41..145V , doi :10.1016/j.geobios.2006.09.005 , retrieved 2019-03-06
Visconti, Graciela; Melchor, Ricardo N.; Montalvo, Claudia I.; Umazano, Aldo M.; De Elorriaga, Elena E. (2010), "Análisis litoestratigráfico de la Formación Cerro Azul (Mioceno Superior) en la Provincia de La Pampa" (PDF) , Revista de la Asociación Geológica Argentina 67 , retrieved 2019-03-06
Gran Bajo del Gualicho Formation
Buono, Mónica R (2013), Evolución de los Balaenidae (Mammalia, Cetacea, Mysticeti) del Mioceno de Patagonia: Sistemática, Filogenia y Aspectos Paleobiológicos (PDF) , Universidad Nacional de La Plata , pp. 1–232, retrieved 2019-03-06
Reichler, Valeria A (2010), "Estratigrafía y paleontología del Cenozoico marino del Gran Bajo y Salinas del Gualicho, Argentina, y descripción de 17 especies nuevas" (PDF) , Andean Geology 31 , retrieved 2019-03-06
Río Negro Formation
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Colorado_Basin,_Argentina&oldid=1235960375 " C a t e g o r i e s : ● R i f t b a s i n s ● P a s s i v e m a r g i n s ● M e s o z o i c r i f t s a n d g r a b e n s ● S e d i m e n t a r y b a s i n s o f A r g e n t i n a ● G e o l o g y o f B u e n o s A i r e s P r o v i n c e ● G e o l o g y o f R í o N e g r o P r o v i n c e ● G e o l o g y o f P a t a g o n i a ● G e o l o g y o f t h e A t l a n t i c O c e a n H i d d e n c a t e g o r i e s : ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n m a t c h e s W i k i d a t a ● P a g e s u s i n g g a d g e t W i k i M i n i A t l a s ● A r t i c l e s c o n t a i n i n g S p a n i s h - l a n g u a g e t e x t ● C S 1 : l o n g v o l u m e v a l u e ● W e b a r c h i v e t e m p l a t e w a y b a c k l i n k s
● T h i s p a g e w a s l a s t e d i t e d o n 2 2 J u l y 2 0 2 4 , a t 0 3 : 5 7 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
Argentina
