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

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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 i...

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Autores principales: Uriz, Norberto Javier, Cingolani, Carlos Alberto, Chemale Jr., F., Armstrong, R. A.
Formato: Objeto de conferencia
Lenguaje:Inglés
Publicado: 2008
Materias:
Geología
U-Pb zircon ages
Sierra Grande Formation
North Patagonian Massif
Silurian-Devonian
provenance
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/158419
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-158419
record_format dspace
spelling I19-R120-10915-1584192023-10-05T04:06:43Z http://sedici.unlp.edu.ar/handle/10915/158419 U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina Uriz, Norberto Javier Cingolani, Carlos Alberto Chemale Jr., F. Armstrong, R. A. 2008 2008 2023-10-04T18:38:55Z en Geología U-Pb zircon ages Sierra Grande Formation North Patagonian Massif Silurian-Devonian provenance 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 Objeto de conferencia Objeto de conferencia http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
U-Pb zircon ages
Sierra Grande Formation
North Patagonian Massif
Silurian-Devonian
provenance
spellingShingle Geología
U-Pb zircon ages
Sierra Grande Formation
North Patagonian Massif
Silurian-Devonian
provenance
Uriz, Norberto Javier
Cingolani, Carlos Alberto
Chemale Jr., F.
Armstrong, R. A.
U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina
topic_facet Geología
U-Pb zircon ages
Sierra Grande Formation
North Patagonian Massif
Silurian-Devonian
provenance
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.
format Objeto de conferencia
Objeto de conferencia
author Uriz, Norberto Javier
Cingolani, Carlos Alberto
Chemale Jr., F.
Armstrong, R. A.
author_facet Uriz, Norberto Javier
Cingolani, Carlos Alberto
Chemale Jr., F.
Armstrong, R. A.
author_sort Uriz, Norberto Javier
title U-Pb detrital zircon data from the paleozoic Sierra Grande Formation, North Patagonian Massif, Argentina
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
publishDate 2008
url http://sedici.unlp.edu.ar/handle/10915/158419
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AT cingolanicarlosalberto upbdetritalzircondatafromthepaleozoicsierragrandeformationnorthpatagonianmassifargentina
AT chemalejrf upbdetritalzircondatafromthepaleozoicsierragrandeformationnorthpatagonianmassifargentina
AT armstrongra upbdetritalzircondatafromthepaleozoicsierragrandeformationnorthpatagonianmassifargentina
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