Provenance of Ordovician clastic sequences of the San Rafael Block (Central Argentina), with emphasis on the Ponón Trehué Formation

The Ordovician Ponón Trehué Formation is the only early Palaeozoic sedimentary sequence known to record a primary contact with the Grenvillian-age basement of the Argentinean Cuyania terrane, in its southwards extension named the San Rafael block. Petrographic and geochemical data indicate contribut...

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Autores principales: Abre, P., Cingolani, Carlos Alberto, Zimmermann, U., Cairncross, B., Chemale Jr., F.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Ciencias Naturales
Cuyania terrane
Provenance
Geochemistry
Isotope geochemistry
Detrital zircon dating
Ordovician
Ponón Trehué and Pavón Formations
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/156023
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SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-156023
record_format dspace
spelling I19-R120-10915-1560232023-08-08T04:06:29Z http://sedici.unlp.edu.ar/handle/10915/156023 Provenance of Ordovician clastic sequences of the San Rafael Block (Central Argentina), with emphasis on the Ponón Trehué Formation Abre, P. Cingolani, Carlos Alberto Zimmermann, U. Cairncross, B. Chemale Jr., F. 2011 2023-08-07T18:09:23Z en Ciencias Naturales Cuyania terrane Provenance Geochemistry Isotope geochemistry Detrital zircon dating Ordovician Ponón Trehué and Pavón Formations The Ordovician Ponón Trehué Formation is the only early Palaeozoic sedimentary sequence known to record a primary contact with the Grenvillian-age basement of the Argentinean Cuyania terrane, in its southwards extension named the San Rafael block. Petrographic and geochemical data indicate contributions from a dominantly upper continental crustal component and a subordinated depleted component. Nd isotopes indicate εNd of −4.6, ƒSm/Nd −0.36 and TDM 1.47 Ga in average. Pb-isotope ratios display average values for 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb of 19.15, 15.69 and 38.94 respectively. U–Pb detrital zircon ages from the Ponón Trehué Formation cluster around values of 1.2 Ga, indicating a main derivation from a local basement source (Cerro La Ventana Formation). The Upper Ordovician Pavón Formation records a younger episode of clastic sedimentation within the San Rafael block, and it shows a more complex detrital zircon age population (peaks at 1.1 and 1.4 Ga as well as Palaeoproterozoic and Neoproterozoic detrital grains). Detailed comparison between the two Ordovician clastic units indicates a shift with time in provenance from localized basement to more regional sources. Middle to early Upper Ordovician age is inferred for accretion of the Cuyania terrane to the proto-Andean margin of Gondwana. Centro de Investigaciones Geológicas Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf 275-290
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Cuyania terrane
Provenance
Geochemistry
Isotope geochemistry
Detrital zircon dating
Ordovician
Ponón Trehué and Pavón Formations
spellingShingle Ciencias Naturales
Cuyania terrane
Provenance
Geochemistry
Isotope geochemistry
Detrital zircon dating
Ordovician
Ponón Trehué and Pavón Formations
Abre, P.
Cingolani, Carlos Alberto
Zimmermann, U.
Cairncross, B.
Chemale Jr., F.
Provenance of Ordovician clastic sequences of the San Rafael Block (Central Argentina), with emphasis on the Ponón Trehué Formation
topic_facet Ciencias Naturales
Cuyania terrane
Provenance
Geochemistry
Isotope geochemistry
Detrital zircon dating
Ordovician
Ponón Trehué and Pavón Formations
description The Ordovician Ponón Trehué Formation is the only early Palaeozoic sedimentary sequence known to record a primary contact with the Grenvillian-age basement of the Argentinean Cuyania terrane, in its southwards extension named the San Rafael block. Petrographic and geochemical data indicate contributions from a dominantly upper continental crustal component and a subordinated depleted component. Nd isotopes indicate εNd of −4.6, ƒSm/Nd −0.36 and TDM 1.47 Ga in average. Pb-isotope ratios display average values for 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb of 19.15, 15.69 and 38.94 respectively. U–Pb detrital zircon ages from the Ponón Trehué Formation cluster around values of 1.2 Ga, indicating a main derivation from a local basement source (Cerro La Ventana Formation). The Upper Ordovician Pavón Formation records a younger episode of clastic sedimentation within the San Rafael block, and it shows a more complex detrital zircon age population (peaks at 1.1 and 1.4 Ga as well as Palaeoproterozoic and Neoproterozoic detrital grains). Detailed comparison between the two Ordovician clastic units indicates a shift with time in provenance from localized basement to more regional sources. Middle to early Upper Ordovician age is inferred for accretion of the Cuyania terrane to the proto-Andean margin of Gondwana.
format Articulo
Articulo
author Abre, P.
Cingolani, Carlos Alberto
Zimmermann, U.
Cairncross, B.
Chemale Jr., F.
author_facet Abre, P.
Cingolani, Carlos Alberto
Zimmermann, U.
Cairncross, B.
Chemale Jr., F.
author_sort Abre, P.
title Provenance of Ordovician clastic sequences of the San Rafael Block (Central Argentina), with emphasis on the Ponón Trehué Formation
title_short Provenance of Ordovician clastic sequences of the San Rafael Block (Central Argentina), with emphasis on the Ponón Trehué Formation
title_full Provenance of Ordovician clastic sequences of the San Rafael Block (Central Argentina), with emphasis on the Ponón Trehué Formation
title_fullStr Provenance of Ordovician clastic sequences of the San Rafael Block (Central Argentina), with emphasis on the Ponón Trehué Formation
title_full_unstemmed Provenance of Ordovician clastic sequences of the San Rafael Block (Central Argentina), with emphasis on the Ponón Trehué Formation
title_sort provenance of ordovician clastic sequences of the san rafael block (central argentina), with emphasis on the ponón trehué formation
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/156023
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