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
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/4562

id CONICETDig_34eb6af9a2a7b801bf41a2b5697b379a
oai_identifier_str oai:ri.conicet.gov.ar:11336/4562
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling 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/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv IAHS
publisher.none.fl_str_mv IAHS
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1844613361916968960
score 13.070432