Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina

Autores
Mehl, Adriana Ester; Zárate, Marcelo Arístides; Lorenzo, Florencia Romina
Año de publicación
2022
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In arid central-west Argentina, South America, many wetlands have developed in association with rivers draining the Andean piedmont and are vital hotspots for resources. However, knowledge about their long-term evolution is generally scarce. The Bañados del Atuel wetland, a low gradient fluvio-aeolian plain linked to the Atuel-Diamante fluvial system, is analyzed to depict its geomorphological and sedimentological Holocene evolution. The study area comprises a fluvial fill terrace with fine-grained alluvial deposits (~ 4186?4419 cal years BP), deposited by a palaeodistributary fluvial system, that is covered by SW?NE oriented aeolian dune complexes. The present-day wetland, which developed after formation of the fill terrace, is characterized by: (1) a NW?SE oriented floodplain with distributary channels and fine-grained, massive to laminated deposits of low organic matter content, dated to 2755?2864 and 729?895 cal years BP, and includes SW?NE oriented dune systems and salt flat depressions; and (2) a transfer area with active headcutting channels, entrenched in the fill terrace, that connects the NW?SE oriented floodplain with (3) a saline endorheic depression (salt lake) with active deflation. The fill terrace distribution suggests much more extensive floodplain environments prior to the late Holocene; the present-day wetland is not older than the last 2?3 millennia and records a late Holocene trend of floodplain size reduction. Fluvial processes of avulsion were likely driven by mid and late Holocene El Niño Southern Oscillation (ENSO) events. Late Holocene arid conditions favoured aeolian dune formation and fluvio-aeolian interactions. Furthermore, anthropogenic river modifications, starting ~ 200 years ago, also have promoted severe changes in the Atuel-Diamante fluvial system, deepening the aridity in the wetland.
Fil: Mehl, Adriana Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentina
Fil: Zárate, Marcelo Arístides. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentina
Fil: Lorenzo, Florencia Romina. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
Late quaternary
Wetland landforms
Avulsions
Aeolian dunes
Fluvio?aeolian interactions
Anthropogenic impact
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:11336/213202
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/213202
network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Holocene evolution of a floodplain wetland in the dryland piedmont of central-west ArgentinaMehl, Adriana EsterZárate, Marcelo ArístidesLorenzo, Florencia RominaLate quaternaryWetland landformsAvulsionsAeolian dunesFluvio?aeolian interactionsAnthropogenic impacthttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1In arid central-west Argentina, South America, many wetlands have developed in association with rivers draining the Andean piedmont and are vital hotspots for resources. However, knowledge about their long-term evolution is generally scarce. The Bañados del Atuel wetland, a low gradient fluvio-aeolian plain linked to the Atuel-Diamante fluvial system, is analyzed to depict its geomorphological and sedimentological Holocene evolution. The study area comprises a fluvial fill terrace with fine-grained alluvial deposits (~ 4186?4419 cal years BP), deposited by a palaeodistributary fluvial system, that is covered by SW?NE oriented aeolian dune complexes. The present-day wetland, which developed after formation of the fill terrace, is characterized by: (1) a NW?SE oriented floodplain with distributary channels and fine-grained, massive to laminated deposits of low organic matter content, dated to 2755?2864 and 729?895 cal years BP, and includes SW?NE oriented dune systems and salt flat depressions; and (2) a transfer area with active headcutting channels, entrenched in the fill terrace, that connects the NW?SE oriented floodplain with (3) a saline endorheic depression (salt lake) with active deflation. The fill terrace distribution suggests much more extensive floodplain environments prior to the late Holocene; the present-day wetland is not older than the last 2?3 millennia and records a late Holocene trend of floodplain size reduction. Fluvial processes of avulsion were likely driven by mid and late Holocene El Niño Southern Oscillation (ENSO) events. Late Holocene arid conditions favoured aeolian dune formation and fluvio-aeolian interactions. Furthermore, anthropogenic river modifications, starting ~ 200 years ago, also have promoted severe changes in the Atuel-Diamante fluvial system, deepening the aridity in the wetland.Fil: Mehl, Adriana Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; ArgentinaFil: Zárate, Marcelo Arístides. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; ArgentinaFil: Lorenzo, Florencia Romina. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaSpringer2022-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/213202Mehl, Adriana Ester; Zárate, Marcelo Arístides; Lorenzo, Florencia Romina; Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina; Springer; Wetlands Ecology and Management; 30; 4; 5-2022; 647-6730923-4861CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s11273-022-09880-6info:eu-repo/semantics/altIdentifier/doi/10.1007/s11273-022-09880-6info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:13:12Zoai:ri.conicet.gov.ar:11336/213202instacron: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:34982025-10-22 11:13:13.335CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina
title Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina
spellingShingle Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina
Mehl, Adriana Ester
Late quaternary
Wetland landforms
Avulsions
Aeolian dunes
Fluvio?aeolian interactions
Anthropogenic impact
title_short Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina
title_full Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina
title_fullStr Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina
title_full_unstemmed Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina
title_sort Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina
dc.creator.none.fl_str_mv Mehl, Adriana Ester
Zárate, Marcelo Arístides
Lorenzo, Florencia Romina
author Mehl, Adriana Ester
author_facet Mehl, Adriana Ester
Zárate, Marcelo Arístides
Lorenzo, Florencia Romina
author_role author
author2 Zárate, Marcelo Arístides
Lorenzo, Florencia Romina
author2_role author
author
dc.subject.none.fl_str_mv Late quaternary
Wetland landforms
Avulsions
Aeolian dunes
Fluvio?aeolian interactions
Anthropogenic impact
topic Late quaternary
Wetland landforms
Avulsions
Aeolian dunes
Fluvio?aeolian interactions
Anthropogenic impact
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv In arid central-west Argentina, South America, many wetlands have developed in association with rivers draining the Andean piedmont and are vital hotspots for resources. However, knowledge about their long-term evolution is generally scarce. The Bañados del Atuel wetland, a low gradient fluvio-aeolian plain linked to the Atuel-Diamante fluvial system, is analyzed to depict its geomorphological and sedimentological Holocene evolution. The study area comprises a fluvial fill terrace with fine-grained alluvial deposits (~ 4186?4419 cal years BP), deposited by a palaeodistributary fluvial system, that is covered by SW?NE oriented aeolian dune complexes. The present-day wetland, which developed after formation of the fill terrace, is characterized by: (1) a NW?SE oriented floodplain with distributary channels and fine-grained, massive to laminated deposits of low organic matter content, dated to 2755?2864 and 729?895 cal years BP, and includes SW?NE oriented dune systems and salt flat depressions; and (2) a transfer area with active headcutting channels, entrenched in the fill terrace, that connects the NW?SE oriented floodplain with (3) a saline endorheic depression (salt lake) with active deflation. The fill terrace distribution suggests much more extensive floodplain environments prior to the late Holocene; the present-day wetland is not older than the last 2?3 millennia and records a late Holocene trend of floodplain size reduction. Fluvial processes of avulsion were likely driven by mid and late Holocene El Niño Southern Oscillation (ENSO) events. Late Holocene arid conditions favoured aeolian dune formation and fluvio-aeolian interactions. Furthermore, anthropogenic river modifications, starting ~ 200 years ago, also have promoted severe changes in the Atuel-Diamante fluvial system, deepening the aridity in the wetland.
Fil: Mehl, Adriana Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentina
Fil: Zárate, Marcelo Arístides. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentina
Fil: Lorenzo, Florencia Romina. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description In arid central-west Argentina, South America, many wetlands have developed in association with rivers draining the Andean piedmont and are vital hotspots for resources. However, knowledge about their long-term evolution is generally scarce. The Bañados del Atuel wetland, a low gradient fluvio-aeolian plain linked to the Atuel-Diamante fluvial system, is analyzed to depict its geomorphological and sedimentological Holocene evolution. The study area comprises a fluvial fill terrace with fine-grained alluvial deposits (~ 4186?4419 cal years BP), deposited by a palaeodistributary fluvial system, that is covered by SW?NE oriented aeolian dune complexes. The present-day wetland, which developed after formation of the fill terrace, is characterized by: (1) a NW?SE oriented floodplain with distributary channels and fine-grained, massive to laminated deposits of low organic matter content, dated to 2755?2864 and 729?895 cal years BP, and includes SW?NE oriented dune systems and salt flat depressions; and (2) a transfer area with active headcutting channels, entrenched in the fill terrace, that connects the NW?SE oriented floodplain with (3) a saline endorheic depression (salt lake) with active deflation. The fill terrace distribution suggests much more extensive floodplain environments prior to the late Holocene; the present-day wetland is not older than the last 2?3 millennia and records a late Holocene trend of floodplain size reduction. Fluvial processes of avulsion were likely driven by mid and late Holocene El Niño Southern Oscillation (ENSO) events. Late Holocene arid conditions favoured aeolian dune formation and fluvio-aeolian interactions. Furthermore, anthropogenic river modifications, starting ~ 200 years ago, also have promoted severe changes in the Atuel-Diamante fluvial system, deepening the aridity in the wetland.
publishDate 2022
dc.date.none.fl_str_mv 2022-05
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/11336/213202
Mehl, Adriana Ester; Zárate, Marcelo Arístides; Lorenzo, Florencia Romina; Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina; Springer; Wetlands Ecology and Management; 30; 4; 5-2022; 647-673
0923-4861
CONICET Digital
CONICET
url http://hdl.handle.net/11336/213202
identifier_str_mv Mehl, Adriana Ester; Zárate, Marcelo Arístides; Lorenzo, Florencia Romina; Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina; Springer; Wetlands Ecology and Management; 30; 4; 5-2022; 647-673
0923-4861
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s11273-022-09880-6
info:eu-repo/semantics/altIdentifier/doi/10.1007/s11273-022-09880-6
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
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
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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
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