First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results

Autores
Allende, Aylén; Cuitiño, José Ignacio; Espinosa, Marcela Alcira
Año de publicación
2021
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Despite their paleontological relevance as paleoenvironmental and paleoecological indicators, studies of fossil diatom assemblages from Miocene deposits of Patagonia (Argentina) are still scarce. In this work, we present the first record of marine diatoms from the Gaiman Formation (lower Miocene). This marine unit is composed of whitish mudstones, fine sandstones and tuffaceous beds. The samples were collected from outcrops of the coastal area of northeast Chubut at Estancia Redonda Chica locality. Two bioturbated muddy sandstone samples were processed to concentrate diatoms, mounted on a slide and analysed under the microscope at 1000x in order to confirm the presence of diatoms, and to identify the taxonomic composition of the assemblages. The samples are stored at CNP-PIIc collection. Until now, the species Paralia sulcata and Cocconeis placentula and the genus Halamphora sp., Planothidium sp. and Lemnicola sp. were recognized. Due the presence of P. sulcata it is suggested that the sampled sediments were accumulated in a coastal marine environment, with influence of freshwater supply as it is indicated by C. placentula and Lemnicola sp. Moreover, the latter two taxa strongly dominate the samples, while the rest are less abundant. These results confirm the sedimentologic interpretation for the sampled sediments as shallow marine (inner shelf) deposits, although the strong influence of freshwater supply appears as new evidence from the diatom analysis. Finally, this study is part of a more extensive work, in progress, with the objective of providing relevant and complementary information on the paleoenvironmental and stratigraphic analysis of the Gaiman Formation.
Fil: Allende, Aylén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina
Fil: Cuitiño, José Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina
Fil: Espinosa, Marcela Alcira. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina
XII Congreso de la Asociación Paleontológica Argentina
Ciudad Autónoma de Buenos Aires
Argentina
Asociación Paleontológica Argentina
Materia
FOSSIL
DIATOMS
NEOGENE
CHUBUT
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/172865
Acceder
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network_name_str CONICET Digital (CONICET)
spelling First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary resultsAllende, AylénCuitiño, José IgnacioEspinosa, Marcela AlciraFOSSILDIATOMSNEOGENECHUBUThttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Despite their paleontological relevance as paleoenvironmental and paleoecological indicators, studies of fossil diatom assemblages from Miocene deposits of Patagonia (Argentina) are still scarce. In this work, we present the first record of marine diatoms from the Gaiman Formation (lower Miocene). This marine unit is composed of whitish mudstones, fine sandstones and tuffaceous beds. The samples were collected from outcrops of the coastal area of northeast Chubut at Estancia Redonda Chica locality. Two bioturbated muddy sandstone samples were processed to concentrate diatoms, mounted on a slide and analysed under the microscope at 1000x in order to confirm the presence of diatoms, and to identify the taxonomic composition of the assemblages. The samples are stored at CNP-PIIc collection. Until now, the species Paralia sulcata and Cocconeis placentula and the genus Halamphora sp., Planothidium sp. and Lemnicola sp. were recognized. Due the presence of P. sulcata it is suggested that the sampled sediments were accumulated in a coastal marine environment, with influence of freshwater supply as it is indicated by C. placentula and Lemnicola sp. Moreover, the latter two taxa strongly dominate the samples, while the rest are less abundant. These results confirm the sedimentologic interpretation for the sampled sediments as shallow marine (inner shelf) deposits, although the strong influence of freshwater supply appears as new evidence from the diatom analysis. Finally, this study is part of a more extensive work, in progress, with the objective of providing relevant and complementary information on the paleoenvironmental and stratigraphic analysis of the Gaiman Formation.Fil: Allende, Aylén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; ArgentinaFil: Cuitiño, José Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; ArgentinaFil: Espinosa, Marcela Alcira. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaXII Congreso de la Asociación Paleontológica ArgentinaCiudad Autónoma de Buenos AiresArgentinaAsociación Paleontológica ArgentinaAsociación Paleontológica ArgentinaLuci, LeticiaMartinelli, Agustín GuillermoVera, Ezequiel IgnacioCariglino, BarbaraEzcurra, Martin DanielFernández, Diana Elizabeth2021info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/vnd.openxmlformats-officedocument.wordprocessingml.documentapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/172865First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results; XII Congreso de la Asociación Paleontológica Argentina; Ciudad Autónoma de Buenos Aires; Argentina; 2021; 83-842469-0228CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.peapaleontologica.org.ar/index.php/peapa/article/view/422Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:19:32Zoai:ri.conicet.gov.ar:11336/172865instacron: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:34982025-10-15 15:19:33.164CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results
title First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results
spellingShingle First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results
Allende, Aylén
FOSSIL
DIATOMS
NEOGENE
CHUBUT
title_short First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results
title_full First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results
title_fullStr First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results
title_full_unstemmed First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results
title_sort First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results
dc.creator.none.fl_str_mv Allende, Aylén
Cuitiño, José Ignacio
Espinosa, Marcela Alcira
author Allende, Aylén
author_facet Allende, Aylén
Cuitiño, José Ignacio
Espinosa, Marcela Alcira
author_role author
author2 Cuitiño, José Ignacio
Espinosa, Marcela Alcira
author2_role author
author
dc.contributor.none.fl_str_mv Luci, Leticia
Martinelli, Agustín Guillermo
Vera, Ezequiel Ignacio
Cariglino, Barbara
Ezcurra, Martin Daniel
Fernández, Diana Elizabeth
dc.subject.none.fl_str_mv FOSSIL
DIATOMS
NEOGENE
CHUBUT
topic FOSSIL
DIATOMS
NEOGENE
CHUBUT
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Despite their paleontological relevance as paleoenvironmental and paleoecological indicators, studies of fossil diatom assemblages from Miocene deposits of Patagonia (Argentina) are still scarce. In this work, we present the first record of marine diatoms from the Gaiman Formation (lower Miocene). This marine unit is composed of whitish mudstones, fine sandstones and tuffaceous beds. The samples were collected from outcrops of the coastal area of northeast Chubut at Estancia Redonda Chica locality. Two bioturbated muddy sandstone samples were processed to concentrate diatoms, mounted on a slide and analysed under the microscope at 1000x in order to confirm the presence of diatoms, and to identify the taxonomic composition of the assemblages. The samples are stored at CNP-PIIc collection. Until now, the species Paralia sulcata and Cocconeis placentula and the genus Halamphora sp., Planothidium sp. and Lemnicola sp. were recognized. Due the presence of P. sulcata it is suggested that the sampled sediments were accumulated in a coastal marine environment, with influence of freshwater supply as it is indicated by C. placentula and Lemnicola sp. Moreover, the latter two taxa strongly dominate the samples, while the rest are less abundant. These results confirm the sedimentologic interpretation for the sampled sediments as shallow marine (inner shelf) deposits, although the strong influence of freshwater supply appears as new evidence from the diatom analysis. Finally, this study is part of a more extensive work, in progress, with the objective of providing relevant and complementary information on the paleoenvironmental and stratigraphic analysis of the Gaiman Formation.
Fil: Allende, Aylén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina
Fil: Cuitiño, José Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina
Fil: Espinosa, Marcela Alcira. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina
XII Congreso de la Asociación Paleontológica Argentina
Ciudad Autónoma de Buenos Aires
Argentina
Asociación Paleontológica Argentina
description Despite their paleontological relevance as paleoenvironmental and paleoecological indicators, studies of fossil diatom assemblages from Miocene deposits of Patagonia (Argentina) are still scarce. In this work, we present the first record of marine diatoms from the Gaiman Formation (lower Miocene). This marine unit is composed of whitish mudstones, fine sandstones and tuffaceous beds. The samples were collected from outcrops of the coastal area of northeast Chubut at Estancia Redonda Chica locality. Two bioturbated muddy sandstone samples were processed to concentrate diatoms, mounted on a slide and analysed under the microscope at 1000x in order to confirm the presence of diatoms, and to identify the taxonomic composition of the assemblages. The samples are stored at CNP-PIIc collection. Until now, the species Paralia sulcata and Cocconeis placentula and the genus Halamphora sp., Planothidium sp. and Lemnicola sp. were recognized. Due the presence of P. sulcata it is suggested that the sampled sediments were accumulated in a coastal marine environment, with influence of freshwater supply as it is indicated by C. placentula and Lemnicola sp. Moreover, the latter two taxa strongly dominate the samples, while the rest are less abundant. These results confirm the sedimentologic interpretation for the sampled sediments as shallow marine (inner shelf) deposits, although the strong influence of freshwater supply appears as new evidence from the diatom analysis. Finally, this study is part of a more extensive work, in progress, with the objective of providing relevant and complementary information on the paleoenvironmental and stratigraphic analysis of the Gaiman Formation.
publishDate 2021
dc.date.none.fl_str_mv 2021
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Congreso
Journal
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/11336/172865
First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results; XII Congreso de la Asociación Paleontológica Argentina; Ciudad Autónoma de Buenos Aires; Argentina; 2021; 83-84
2469-0228
CONICET Digital
CONICET
url http://hdl.handle.net/11336/172865
identifier_str_mv First record of miocene marine fossil diatoms from northeast patagonia, Argentina: Preliminary results; XII Congreso de la Asociación Paleontológica Argentina; Ciudad Autónoma de Buenos Aires; Argentina; 2021; 83-84
2469-0228
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://www.peapaleontologica.org.ar/index.php/peapa/article/view/422
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/vnd.openxmlformats-officedocument.wordprocessingml.document
application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Asociación Paleontológica Argentina
publisher.none.fl_str_mv Asociación Paleontológica Argentina
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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