Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina
- Autores
- Melo, Walter Daniel; Perillo, Gerardo Miguel E.; Perillo, Mauricio Miguel; Schilizzi, Roberto; Piccolo, Maria Cintia
- Año de publicación
- 2013
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Along the Argentina coast there are only two present day deltas, the Paraná and Colorado deltas, both located on the Buenos Aires Province. However, the Colorado Delta is only a minor remnant of a much larger delta system that was active from approximately 10000 calibrated years BP, when mean sea level (msl) was about -30 m. Based on bathymetric and topographic maps, regional geology and bibliography, the evolution of the delta system is proposed. During the Last Glacial Maximum (LGM), 24,000 calibrated years BP, msl was -130 m, located at the present shelf break. During this period the fluvial drainage was minimum. As climate conditions changed, it can be deduced from well preserved terraces, that the msl increased in pulses. The uppermost terrace, located at -25/-30 m corresponds to deltaic front of the Colorado and Negro rivers. At this time, the fluvial discharge was large and a series of rivers (most of them no longer existing today) provided sediments to the deltas. The Colorado River and a set of unnamed rivers were active to the northern and central portion of this 430 km delta front, whereas the Negro River provided materials to the lower central and southern portions. We estimate that the major sediment and water inputs occurred at about 9,000 calibrated years BP, when msl was -18 m. Delta evolution was significantly modified when msl was up to 6 m above present 6,000 calibrated years BP. At this time, both the Colorado and Negro rivers migrated southward. Msl decreased at about 4 mm/yr until it reached the lowest level, about -2 m during the Little Ice Age. Today, the only active delta is the one maintained by a diminished Colorado River in the central part of the area. The northern and southern portions are now extensive intertidal areas with remnant islands and large tidal channels corresponding,respectively, to Bahía Blanca Estuary and Anegada Bay. The Negro River has an estuary at its mouth but no delta is active today.
Fil: Melo, Walter Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geografía; Argentina
Fil: Perillo, Gerardo Miguel E.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geología; Argentina
Fil: Perillo, Mauricio Miguel. University of Texas at Austin. Department of Geological Sciences; Estados Unidos
Fil: Schilizzi, Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geología; Argentina
Fil: Piccolo, Maria Cintia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geografía; Argentina - Materia
-
Delta Evolution
Colorado River Delta
Negro River
Argentina - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/4562
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Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, ArgentinaMelo, Walter DanielPerillo, Gerardo Miguel E.Perillo, Mauricio MiguelSchilizzi, RobertoPiccolo, Maria CintiaDelta EvolutionColorado River DeltaNegro RiverArgentinahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Along the Argentina coast there are only two present day deltas, the Paraná and Colorado deltas, both located on the Buenos Aires Province. However, the Colorado Delta is only a minor remnant of a much larger delta system that was active from approximately 10000 calibrated years BP, when mean sea level (msl) was about -30 m. Based on bathymetric and topographic maps, regional geology and bibliography, the evolution of the delta system is proposed. During the Last Glacial Maximum (LGM), 24,000 calibrated years BP, msl was -130 m, located at the present shelf break. During this period the fluvial drainage was minimum. As climate conditions changed, it can be deduced from well preserved terraces, that the msl increased in pulses. The uppermost terrace, located at -25/-30 m corresponds to deltaic front of the Colorado and Negro rivers. At this time, the fluvial discharge was large and a series of rivers (most of them no longer existing today) provided sediments to the deltas. The Colorado River and a set of unnamed rivers were active to the northern and central portion of this 430 km delta front, whereas the Negro River provided materials to the lower central and southern portions. We estimate that the major sediment and water inputs occurred at about 9,000 calibrated years BP, when msl was -18 m. Delta evolution was significantly modified when msl was up to 6 m above present 6,000 calibrated years BP. At this time, both the Colorado and Negro rivers migrated southward. Msl decreased at about 4 mm/yr until it reached the lowest level, about -2 m during the Little Ice Age. Today, the only active delta is the one maintained by a diminished Colorado River in the central part of the area. The northern and southern portions are now extensive intertidal areas with remnant islands and large tidal channels corresponding,respectively, to Bahía Blanca Estuary and Anegada Bay. The Negro River has an estuary at its mouth but no delta is active today.Fil: Melo, Walter Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geografía; ArgentinaFil: Perillo, Gerardo Miguel E.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geología; ArgentinaFil: Perillo, Mauricio Miguel. University of Texas at Austin. Department of Geological Sciences; Estados UnidosFil: Schilizzi, Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geología; ArgentinaFil: Piccolo, Maria Cintia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geografía; ArgentinaIAHS2013-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/4562Melo, Walter Daniel; Perillo, Gerardo Miguel E.; Perillo, Mauricio Miguel; Schilizzi, Roberto; Piccolo, Maria Cintia; Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina; IAHS; Deltas: Landforms, Ecosystems and Human Activities; 358; 6-2013; 187-1950144-7815enginfo:eu-repo/semantics/altIdentifier/url/http://iahs.info/uploads/dms/15464.358%20187-195.pdfinfo:eu-repo/semantics/altIdentifier/issn/0144-7815info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:43:16Zoai:ri.conicet.gov.ar:11336/4562instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:43:16.601CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina |
title |
Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina |
spellingShingle |
Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina Melo, Walter Daniel Delta Evolution Colorado River Delta Negro River Argentina |
title_short |
Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina |
title_full |
Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina |
title_fullStr |
Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina |
title_full_unstemmed |
Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina |
title_sort |
Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina |
dc.creator.none.fl_str_mv |
Melo, Walter Daniel Perillo, Gerardo Miguel E. Perillo, Mauricio Miguel Schilizzi, Roberto Piccolo, Maria Cintia |
author |
Melo, Walter Daniel |
author_facet |
Melo, Walter Daniel Perillo, Gerardo Miguel E. Perillo, Mauricio Miguel Schilizzi, Roberto Piccolo, Maria Cintia |
author_role |
author |
author2 |
Perillo, Gerardo Miguel E. Perillo, Mauricio Miguel Schilizzi, Roberto Piccolo, Maria Cintia |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
Delta Evolution Colorado River Delta Negro River Argentina |
topic |
Delta Evolution Colorado River Delta Negro River Argentina |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Along the Argentina coast there are only two present day deltas, the Paraná and Colorado deltas, both located on the Buenos Aires Province. However, the Colorado Delta is only a minor remnant of a much larger delta system that was active from approximately 10000 calibrated years BP, when mean sea level (msl) was about -30 m. Based on bathymetric and topographic maps, regional geology and bibliography, the evolution of the delta system is proposed. During the Last Glacial Maximum (LGM), 24,000 calibrated years BP, msl was -130 m, located at the present shelf break. During this period the fluvial drainage was minimum. As climate conditions changed, it can be deduced from well preserved terraces, that the msl increased in pulses. The uppermost terrace, located at -25/-30 m corresponds to deltaic front of the Colorado and Negro rivers. At this time, the fluvial discharge was large and a series of rivers (most of them no longer existing today) provided sediments to the deltas. The Colorado River and a set of unnamed rivers were active to the northern and central portion of this 430 km delta front, whereas the Negro River provided materials to the lower central and southern portions. We estimate that the major sediment and water inputs occurred at about 9,000 calibrated years BP, when msl was -18 m. Delta evolution was significantly modified when msl was up to 6 m above present 6,000 calibrated years BP. At this time, both the Colorado and Negro rivers migrated southward. Msl decreased at about 4 mm/yr until it reached the lowest level, about -2 m during the Little Ice Age. Today, the only active delta is the one maintained by a diminished Colorado River in the central part of the area. The northern and southern portions are now extensive intertidal areas with remnant islands and large tidal channels corresponding,respectively, to Bahía Blanca Estuary and Anegada Bay. The Negro River has an estuary at its mouth but no delta is active today. Fil: Melo, Walter Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geografía; Argentina Fil: Perillo, Gerardo Miguel E.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geología; Argentina Fil: Perillo, Mauricio Miguel. University of Texas at Austin. Department of Geological Sciences; Estados Unidos Fil: Schilizzi, Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geología; Argentina Fil: Piccolo, Maria Cintia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geografía; Argentina |
description |
Along the Argentina coast there are only two present day deltas, the Paraná and Colorado deltas, both located on the Buenos Aires Province. However, the Colorado Delta is only a minor remnant of a much larger delta system that was active from approximately 10000 calibrated years BP, when mean sea level (msl) was about -30 m. Based on bathymetric and topographic maps, regional geology and bibliography, the evolution of the delta system is proposed. During the Last Glacial Maximum (LGM), 24,000 calibrated years BP, msl was -130 m, located at the present shelf break. During this period the fluvial drainage was minimum. As climate conditions changed, it can be deduced from well preserved terraces, that the msl increased in pulses. The uppermost terrace, located at -25/-30 m corresponds to deltaic front of the Colorado and Negro rivers. At this time, the fluvial discharge was large and a series of rivers (most of them no longer existing today) provided sediments to the deltas. The Colorado River and a set of unnamed rivers were active to the northern and central portion of this 430 km delta front, whereas the Negro River provided materials to the lower central and southern portions. We estimate that the major sediment and water inputs occurred at about 9,000 calibrated years BP, when msl was -18 m. Delta evolution was significantly modified when msl was up to 6 m above present 6,000 calibrated years BP. At this time, both the Colorado and Negro rivers migrated southward. Msl decreased at about 4 mm/yr until it reached the lowest level, about -2 m during the Little Ice Age. Today, the only active delta is the one maintained by a diminished Colorado River in the central part of the area. The northern and southern portions are now extensive intertidal areas with remnant islands and large tidal channels corresponding,respectively, to Bahía Blanca Estuary and Anegada Bay. The Negro River has an estuary at its mouth but no delta is active today. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-06 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/4562 Melo, Walter Daniel; Perillo, Gerardo Miguel E.; Perillo, Mauricio Miguel; Schilizzi, Roberto; Piccolo, Maria Cintia; Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina; IAHS; Deltas: Landforms, Ecosystems and Human Activities; 358; 6-2013; 187-195 0144-7815 |
url |
http://hdl.handle.net/11336/4562 |
identifier_str_mv |
Melo, Walter Daniel; Perillo, Gerardo Miguel E.; Perillo, Mauricio Miguel; Schilizzi, Roberto; Piccolo, Maria Cintia; Late Pleistocene - Holocene deltas in the southern Buenos Aires Province, Argentina; IAHS; Deltas: Landforms, Ecosystems and Human Activities; 358; 6-2013; 187-195 0144-7815 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/http://iahs.info/uploads/dms/15464.358%20187-195.pdf info:eu-repo/semantics/altIdentifier/issn/0144-7815 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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application/pdf application/pdf |
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IAHS |
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IAHS |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844613361916968960 |
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13.070432 |