Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes

Autores
Fernández, Marilén; San Martín, Cristina Natalia; Ponce, Juan Federico; Bigler, C.; Rydberg, J.
Año de publicación
2022
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
In order to analyze environmental and climatic changes during the late Holocene, a lacustrine sediment core was obtained from Laguna Ceniza (54˚ 40’ 38” S; 68˚ 13’ 13” O) located in a hanging valley in the Fuegian Andes (Argentina). The lake is fed by a stream originating from a small cirque glacier located in the valley head. The core (75 cm) was taken close to a delta of the stream and covers the last 2775 cal years BP. Here, we present the preliminary results based on sedimentological, geochemical and diatom data from the upper part of the core (last 1500 cal years BP). The sedimentological analysis shows the presence of six lithofacies: grey silty-sand, reddle silty-sand, laminated sandy-silt, laminated silt, grey clay-silt and white clay-silt. These lithofacies are likely associated to variations in the relative importance of glacier dynamics and mass movement processes from the valley slopes. The geochemical data (ITRAX core scanner) show a general decrease in the Al-Ti towards the top, and throughout the core there are several distinct peaks in Ca-Sr (possibly indicating input from the glacier). The diatom assemblages show a variety of species mainly dominated by Pinnularia microstauron (60 %) and P. interrupta, P. viridiformis, Aulacoseira alpigena, Brachysira huitatorum, Encyonema difficilis, Frustulia aff fuegiana, F. rhomboides and Veigaludwigia urbana in lower frequency (20%). In general, these taxa indicate a freshwater basin with oligotrophic conditions. At 16-17 cm of the core (900 cal years BP), Achnanthidium minutisimum reaches a frequency of 40%, together with an increase of Psammothidium incognitum (28%) and P. confusum (9%). The clear rise in the mentioned diatoms is associated to the reddle silty sand lithofacie, suggesting the occurrence of a highenergy flow event into the lake.
Fil: Fernández, Marilén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; Argentina
Fil: San Martín, Cristina Natalia. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Ponce, Juan Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; Argentina
Fil: Bigler, C.. Universidad de Umea; Suecia
Fil: Rydberg, J.. Universidad de Umea; Suecia
IAL-IPA 2022 meeting: Lagos, Memorias del Territorio
San Carlos de Bariloche
Argentina
International Assosiation of Limnology
International Paleolimnology Assosiation
Municipio de Bariloche
Ministerio de Ciencia y Tecnología e innovación de la Republica Argentina
Materia
Diatoms
Geochemestry
Sedimentology
Lakes
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/234780
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian AndesFernández, MarilénSan Martín, Cristina NataliaPonce, Juan FedericoBigler, C.Rydberg, J.DiatomsGeochemestrySedimentologyLakeshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1In order to analyze environmental and climatic changes during the late Holocene, a lacustrine sediment core was obtained from Laguna Ceniza (54˚ 40’ 38” S; 68˚ 13’ 13” O) located in a hanging valley in the Fuegian Andes (Argentina). The lake is fed by a stream originating from a small cirque glacier located in the valley head. The core (75 cm) was taken close to a delta of the stream and covers the last 2775 cal years BP. Here, we present the preliminary results based on sedimentological, geochemical and diatom data from the upper part of the core (last 1500 cal years BP). The sedimentological analysis shows the presence of six lithofacies: grey silty-sand, reddle silty-sand, laminated sandy-silt, laminated silt, grey clay-silt and white clay-silt. These lithofacies are likely associated to variations in the relative importance of glacier dynamics and mass movement processes from the valley slopes. The geochemical data (ITRAX core scanner) show a general decrease in the Al-Ti towards the top, and throughout the core there are several distinct peaks in Ca-Sr (possibly indicating input from the glacier). The diatom assemblages show a variety of species mainly dominated by Pinnularia microstauron (60 %) and P. interrupta, P. viridiformis, Aulacoseira alpigena, Brachysira huitatorum, Encyonema difficilis, Frustulia aff fuegiana, F. rhomboides and Veigaludwigia urbana in lower frequency (20%). In general, these taxa indicate a freshwater basin with oligotrophic conditions. At 16-17 cm of the core (900 cal years BP), Achnanthidium minutisimum reaches a frequency of 40%, together with an increase of Psammothidium incognitum (28%) and P. confusum (9%). The clear rise in the mentioned diatoms is associated to the reddle silty sand lithofacie, suggesting the occurrence of a highenergy flow event into the lake.Fil: Fernández, Marilén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; ArgentinaFil: San Martín, Cristina Natalia. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Ponce, Juan Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; ArgentinaFil: Bigler, C.. Universidad de Umea; SueciaFil: Rydberg, J.. Universidad de Umea; SueciaIAL-IPA 2022 meeting: Lagos, Memorias del TerritorioSan Carlos de BarilocheArgentinaInternational Assosiation of LimnologyInternational Paleolimnology AssosiationMunicipio de BarilocheMinisterio de Ciencia y Tecnología e innovación de la Republica ArgentinaDigital2022info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectEncuentroBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/234780Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes; IAL-IPA 2022 meeting: Lagos, Memorias del Territorio; San Carlos de Bariloche; Argentina; 2022; 310CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://zenodo.org/records/7305148Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:24:19Zoai:ri.conicet.gov.ar:11336/234780instacron: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 10:24:19.463CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes
title Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes
spellingShingle Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes
Fernández, Marilén
Diatoms
Geochemestry
Sedimentology
Lakes
title_short Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes
title_full Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes
title_fullStr Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes
title_full_unstemmed Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes
title_sort Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes
dc.creator.none.fl_str_mv Fernández, Marilén
San Martín, Cristina Natalia
Ponce, Juan Federico
Bigler, C.
Rydberg, J.
author Fernández, Marilén
author_facet Fernández, Marilén
San Martín, Cristina Natalia
Ponce, Juan Federico
Bigler, C.
Rydberg, J.
author_role author
author2 San Martín, Cristina Natalia
Ponce, Juan Federico
Bigler, C.
Rydberg, J.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Diatoms
Geochemestry
Sedimentology
Lakes
topic Diatoms
Geochemestry
Sedimentology
Lakes
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 order to analyze environmental and climatic changes during the late Holocene, a lacustrine sediment core was obtained from Laguna Ceniza (54˚ 40’ 38” S; 68˚ 13’ 13” O) located in a hanging valley in the Fuegian Andes (Argentina). The lake is fed by a stream originating from a small cirque glacier located in the valley head. The core (75 cm) was taken close to a delta of the stream and covers the last 2775 cal years BP. Here, we present the preliminary results based on sedimentological, geochemical and diatom data from the upper part of the core (last 1500 cal years BP). The sedimentological analysis shows the presence of six lithofacies: grey silty-sand, reddle silty-sand, laminated sandy-silt, laminated silt, grey clay-silt and white clay-silt. These lithofacies are likely associated to variations in the relative importance of glacier dynamics and mass movement processes from the valley slopes. The geochemical data (ITRAX core scanner) show a general decrease in the Al-Ti towards the top, and throughout the core there are several distinct peaks in Ca-Sr (possibly indicating input from the glacier). The diatom assemblages show a variety of species mainly dominated by Pinnularia microstauron (60 %) and P. interrupta, P. viridiformis, Aulacoseira alpigena, Brachysira huitatorum, Encyonema difficilis, Frustulia aff fuegiana, F. rhomboides and Veigaludwigia urbana in lower frequency (20%). In general, these taxa indicate a freshwater basin with oligotrophic conditions. At 16-17 cm of the core (900 cal years BP), Achnanthidium minutisimum reaches a frequency of 40%, together with an increase of Psammothidium incognitum (28%) and P. confusum (9%). The clear rise in the mentioned diatoms is associated to the reddle silty sand lithofacie, suggesting the occurrence of a highenergy flow event into the lake.
Fil: Fernández, Marilén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; Argentina
Fil: San Martín, Cristina Natalia. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Ponce, Juan Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; Argentina
Fil: Bigler, C.. Universidad de Umea; Suecia
Fil: Rydberg, J.. Universidad de Umea; Suecia
IAL-IPA 2022 meeting: Lagos, Memorias del Territorio
San Carlos de Bariloche
Argentina
International Assosiation of Limnology
International Paleolimnology Assosiation
Municipio de Bariloche
Ministerio de Ciencia y Tecnología e innovación de la Republica Argentina
description In order to analyze environmental and climatic changes during the late Holocene, a lacustrine sediment core was obtained from Laguna Ceniza (54˚ 40’ 38” S; 68˚ 13’ 13” O) located in a hanging valley in the Fuegian Andes (Argentina). The lake is fed by a stream originating from a small cirque glacier located in the valley head. The core (75 cm) was taken close to a delta of the stream and covers the last 2775 cal years BP. Here, we present the preliminary results based on sedimentological, geochemical and diatom data from the upper part of the core (last 1500 cal years BP). The sedimentological analysis shows the presence of six lithofacies: grey silty-sand, reddle silty-sand, laminated sandy-silt, laminated silt, grey clay-silt and white clay-silt. These lithofacies are likely associated to variations in the relative importance of glacier dynamics and mass movement processes from the valley slopes. The geochemical data (ITRAX core scanner) show a general decrease in the Al-Ti towards the top, and throughout the core there are several distinct peaks in Ca-Sr (possibly indicating input from the glacier). The diatom assemblages show a variety of species mainly dominated by Pinnularia microstauron (60 %) and P. interrupta, P. viridiformis, Aulacoseira alpigena, Brachysira huitatorum, Encyonema difficilis, Frustulia aff fuegiana, F. rhomboides and Veigaludwigia urbana in lower frequency (20%). In general, these taxa indicate a freshwater basin with oligotrophic conditions. At 16-17 cm of the core (900 cal years BP), Achnanthidium minutisimum reaches a frequency of 40%, together with an increase of Psammothidium incognitum (28%) and P. confusum (9%). The clear rise in the mentioned diatoms is associated to the reddle silty sand lithofacie, suggesting the occurrence of a highenergy flow event into the lake.
publishDate 2022
dc.date.none.fl_str_mv 2022
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
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Book
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/234780
Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes; IAL-IPA 2022 meeting: Lagos, Memorias del Territorio; San Carlos de Bariloche; Argentina; 2022; 310
CONICET Digital
CONICET
url http://hdl.handle.net/11336/234780
identifier_str_mv Diatoms, sedimentology and geochemistry study from a high altitude lake in the Fuegian Andes; IAL-IPA 2022 meeting: Lagos, Memorias del Territorio; San Carlos de Bariloche; Argentina; 2022; 310
CONICET Digital
CONICET
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language eng
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dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
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dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Digital
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repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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