U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina

Autores
Uriz, Norberto Javier; Cingolani, Carlos Alberto; Chemale Jr., F.; Armstrong, R. A.
Año de publicación
2008
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The Sierra Grande Formation is a siliciclastic sedimentary unit with oolithic iron levels of economical importance which crops out in the Argentinean North Patagonian Massif. It was deposited within an open marine environment, with littoral to sub-littoral conditions. A Silurian-Lower Devonian age is assigned based on fossil content. It is mainly composed of medium to fine quartz arenites, wackes, silts, shales and conglomerate beds. In order to establish the source rocks for the Silurian-Devonian basin and also to constrain the sedimentation age, different U-Pb geochronological studies have been carried out on detrital zircons. The zircons have been studied with comparative morphology analysis using SEM images to asses the different population types. For dating using U-Pb isotopes in zircon detrital grains, the high resolution SHRIMP and LA-ICP-MS methodologies were used. The predominant obtained age groups are: Neoproterozoic (547–991 Ma), Cambrian (497-546 Ma) and Ordovician (443-495 Ma). All the analyzed samples also comprise Mesoproterozoic ages of about 1009 to 1382 Ma and smaller proportion Paleoproterozic (1641 to 2248 Ma) and Neo-Archean (2649-2657 Ma) ages. It is important to note that Silurian ages (428 and 440 Ma) were obtained from a group of zircon crystals, constraining the sedimentation age of the Sierra Grande basin to be not older than Middle Silurian. With these isotopic data it is possible to discuss the provenance of the Silurian-Devonian siliciclastic sedimentary cover of the North Patagonian Massif.
Centro de Investigaciones Geológicas
Materia
Geología
U-Pb zircon ages
Sierra Grande Formation
North Patagonian Massif
Silurian-Devonian
provenance
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/158419
Acceder
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spelling U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, ArgentinaUriz, Norberto JavierCingolani, Carlos AlbertoChemale Jr., F.Armstrong, R. A.GeologíaU-Pb zircon agesSierra Grande FormationNorth Patagonian MassifSilurian-DevonianprovenanceThe Sierra Grande Formation is a siliciclastic sedimentary unit with oolithic iron levels of economical importance which crops out in the Argentinean North Patagonian Massif. It was deposited within an open marine environment, with littoral to sub-littoral conditions. A Silurian-Lower Devonian age is assigned based on fossil content. It is mainly composed of medium to fine quartz arenites, wackes, silts, shales and conglomerate beds. In order to establish the source rocks for the Silurian-Devonian basin and also to constrain the sedimentation age, different U-Pb geochronological studies have been carried out on detrital zircons. The zircons have been studied with comparative morphology analysis using SEM images to asses the different population types. For dating using U-Pb isotopes in zircon detrital grains, the high resolution SHRIMP and LA-ICP-MS methodologies were used. The predominant obtained age groups are: Neoproterozoic (547–991 Ma), Cambrian (497-546 Ma) and Ordovician (443-495 Ma). All the analyzed samples also comprise Mesoproterozoic ages of about 1009 to 1382 Ma and smaller proportion Paleoproterozic (1641 to 2248 Ma) and Neo-Archean (2649-2657 Ma) ages. It is important to note that Silurian ages (428 and 440 Ma) were obtained from a group of zircon crystals, constraining the sedimentation age of the Sierra Grande basin to be not older than Middle Silurian. With these isotopic data it is possible to discuss the provenance of the Silurian-Devonian siliciclastic sedimentary cover of the North Patagonian Massif.Centro de Investigaciones Geológicas2008info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionObjeto de conferenciahttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/158419enginfo:eu-repo/semantics/altIdentifier/url/http://naturalis.fcnym.unlp.edu.ar/repositorio/_documentos/sipcyt/bfa000502.pdfinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-03T11:13:18Zoai:sedici.unlp.edu.ar:10915/158419Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-03 11:13:18.855SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina
title U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina
spellingShingle U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina
Uriz, Norberto Javier
Geología
U-Pb zircon ages
Sierra Grande Formation
North Patagonian Massif
Silurian-Devonian
provenance
title_short U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina
title_full U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina
title_fullStr U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina
title_full_unstemmed U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina
title_sort U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina
dc.creator.none.fl_str_mv Uriz, Norberto Javier
Cingolani, Carlos Alberto
Chemale Jr., F.
Armstrong, R. A.
author Uriz, Norberto Javier
author_facet Uriz, Norberto Javier
Cingolani, Carlos Alberto
Chemale Jr., F.
Armstrong, R. A.
author_role author
author2 Cingolani, Carlos Alberto
Chemale Jr., F.
Armstrong, R. A.
author2_role author
author
author
dc.subject.none.fl_str_mv Geología
U-Pb zircon ages
Sierra Grande Formation
North Patagonian Massif
Silurian-Devonian
provenance
topic Geología
U-Pb zircon ages
Sierra Grande Formation
North Patagonian Massif
Silurian-Devonian
provenance
dc.description.none.fl_txt_mv The Sierra Grande Formation is a siliciclastic sedimentary unit with oolithic iron levels of economical importance which crops out in the Argentinean North Patagonian Massif. It was deposited within an open marine environment, with littoral to sub-littoral conditions. A Silurian-Lower Devonian age is assigned based on fossil content. It is mainly composed of medium to fine quartz arenites, wackes, silts, shales and conglomerate beds. In order to establish the source rocks for the Silurian-Devonian basin and also to constrain the sedimentation age, different U-Pb geochronological studies have been carried out on detrital zircons. The zircons have been studied with comparative morphology analysis using SEM images to asses the different population types. For dating using U-Pb isotopes in zircon detrital grains, the high resolution SHRIMP and LA-ICP-MS methodologies were used. The predominant obtained age groups are: Neoproterozoic (547–991 Ma), Cambrian (497-546 Ma) and Ordovician (443-495 Ma). All the analyzed samples also comprise Mesoproterozoic ages of about 1009 to 1382 Ma and smaller proportion Paleoproterozic (1641 to 2248 Ma) and Neo-Archean (2649-2657 Ma) ages. It is important to note that Silurian ages (428 and 440 Ma) were obtained from a group of zircon crystals, constraining the sedimentation age of the Sierra Grande basin to be not older than Middle Silurian. With these isotopic data it is possible to discuss the provenance of the Silurian-Devonian siliciclastic sedimentary cover of the North Patagonian Massif.
Centro de Investigaciones Geológicas
description The Sierra Grande Formation is a siliciclastic sedimentary unit with oolithic iron levels of economical importance which crops out in the Argentinean North Patagonian Massif. It was deposited within an open marine environment, with littoral to sub-littoral conditions. A Silurian-Lower Devonian age is assigned based on fossil content. It is mainly composed of medium to fine quartz arenites, wackes, silts, shales and conglomerate beds. In order to establish the source rocks for the Silurian-Devonian basin and also to constrain the sedimentation age, different U-Pb geochronological studies have been carried out on detrital zircons. The zircons have been studied with comparative morphology analysis using SEM images to asses the different population types. For dating using U-Pb isotopes in zircon detrital grains, the high resolution SHRIMP and LA-ICP-MS methodologies were used. The predominant obtained age groups are: Neoproterozoic (547–991 Ma), Cambrian (497-546 Ma) and Ordovician (443-495 Ma). All the analyzed samples also comprise Mesoproterozoic ages of about 1009 to 1382 Ma and smaller proportion Paleoproterozic (1641 to 2248 Ma) and Neo-Archean (2649-2657 Ma) ages. It is important to note that Silurian ages (428 and 440 Ma) were obtained from a group of zircon crystals, constraining the sedimentation age of the Sierra Grande basin to be not older than Middle Silurian. With these isotopic data it is possible to discuss the provenance of the Silurian-Devonian siliciclastic sedimentary cover of the North Patagonian Massif.
publishDate 2008
dc.date.none.fl_str_mv 2008
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