Whole-rock and isotope geochemistry of Ordovician to Silurian units of the Cuyania terrane, Argentina: insights for the evolution of SW Gondwana margin

The Cuyania terrane in central Argentina (Fig. 1) is characterized by a Mesoproterozoic (Grenvillianage) basement with depleted Pb isotopic signatures and Mesoproterozoic Nd model ages resembling basement rocks of the same age from Laurentia (Ramos, 2004; Sato et al., 2004 and references therein). S...

Descripción completa

Detalles Bibliográficos
Autores principales: Abre, P., Cingolani, Carlos Alberto, Cairncross, B., Chemale Jr., F.
Formato: Objeto de conferencia
Lenguaje:Inglés
Publicado: 2011
Materias:
Geología
Cuyania terrane
Ordovician to Silurian
provenance
geochemistry
U-Pb detrital zircon dating
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/153692
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-153692
record_format dspace
spelling I19-R120-10915-1536922023-05-31T04:06:50Z http://sedici.unlp.edu.ar/handle/10915/153692 isbn:978-84-7840-857-3 Whole-rock and isotope geochemistry of Ordovician to Silurian units of the Cuyania terrane, Argentina: insights for the evolution of SW Gondwana margin Abre, P. Cingolani, Carlos Alberto Cairncross, B. Chemale Jr., F. 2011 2011 2023-05-30T18:29:46Z en Geología Cuyania terrane Ordovician to Silurian provenance geochemistry U-Pb detrital zircon dating The Cuyania terrane in central Argentina (Fig. 1) is characterized by a Mesoproterozoic (Grenvillianage) basement with depleted Pb isotopic signatures and Mesoproterozoic Nd model ages resembling basement rocks of the same age from Laurentia (Ramos, 2004; Sato et al., 2004 and references therein). Several authors have proposed para-autochthonous (Aceñolaza et al., 2002; Finney et al., 2005) versus allochthonous (e. g. Ramos et al., 1986; Dalziel et al., 1994; Astini et al., 1995; Thomas and Astini, 1996) geotectonic models for the early Palaeozoic evolution of the Cuyania terrane. The tectonic evolution of the Cuyania terrane is a substantial part of the understanding of the evolution of the western border of southwest Gondwana. Several morphostructural units form the Cuyania composite terrane (Fig. 1; Ramos et al., 1996): The Precordillera s.s., the Western Pampeanas Ranges and the San Rafael and Las Matras blocks. However, the boundaries of the terrane are still not well-constrained (Astini and Dávila, 2004; Porcher et al., 2004; Casquet et al., 2006). A combination of several methodologies including geochemistry, Sm-Nd, Pb-Pb and U-Pb detrital zircon dating was applied to several clastic Ordovician (Los Sombreros, Gualcamayo, Los Azules, La Cantera, Yerba Loca, Empozada, Trapiche, Sierra de la Invernada, Portezuelo del Tontal, Las Vacas, Las Plantas and Alcaparrosa Formations) and Ordovician to Silurian (Don Braulio and La Chilca Formations) units of the Cuyania terrane (Fig. 2). The combination of these different approaches can give accurate information in order to constrain the probable sources that provided detritus to the Cuyania terrane and ultimately to constrain the existing models about its origin. 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 29-34
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Cuyania terrane
Ordovician to Silurian
provenance
geochemistry
U-Pb detrital zircon dating
spellingShingle Geología
Cuyania terrane
Ordovician to Silurian
provenance
geochemistry
U-Pb detrital zircon dating
Abre, P.
Cingolani, Carlos Alberto
Cairncross, B.
Chemale Jr., F.
Whole-rock and isotope geochemistry of Ordovician to Silurian units of the Cuyania terrane, Argentina: insights for the evolution of SW Gondwana margin
topic_facet Geología
Cuyania terrane
Ordovician to Silurian
provenance
geochemistry
U-Pb detrital zircon dating
description The Cuyania terrane in central Argentina (Fig. 1) is characterized by a Mesoproterozoic (Grenvillianage) basement with depleted Pb isotopic signatures and Mesoproterozoic Nd model ages resembling basement rocks of the same age from Laurentia (Ramos, 2004; Sato et al., 2004 and references therein). Several authors have proposed para-autochthonous (Aceñolaza et al., 2002; Finney et al., 2005) versus allochthonous (e. g. Ramos et al., 1986; Dalziel et al., 1994; Astini et al., 1995; Thomas and Astini, 1996) geotectonic models for the early Palaeozoic evolution of the Cuyania terrane. The tectonic evolution of the Cuyania terrane is a substantial part of the understanding of the evolution of the western border of southwest Gondwana. Several morphostructural units form the Cuyania composite terrane (Fig. 1; Ramos et al., 1996): The Precordillera s.s., the Western Pampeanas Ranges and the San Rafael and Las Matras blocks. However, the boundaries of the terrane are still not well-constrained (Astini and Dávila, 2004; Porcher et al., 2004; Casquet et al., 2006). A combination of several methodologies including geochemistry, Sm-Nd, Pb-Pb and U-Pb detrital zircon dating was applied to several clastic Ordovician (Los Sombreros, Gualcamayo, Los Azules, La Cantera, Yerba Loca, Empozada, Trapiche, Sierra de la Invernada, Portezuelo del Tontal, Las Vacas, Las Plantas and Alcaparrosa Formations) and Ordovician to Silurian (Don Braulio and La Chilca Formations) units of the Cuyania terrane (Fig. 2). The combination of these different approaches can give accurate information in order to constrain the probable sources that provided detritus to the Cuyania terrane and ultimately to constrain the existing models about its origin.
format Objeto de conferencia
Objeto de conferencia
author Abre, P.
Cingolani, Carlos Alberto
Cairncross, B.
Chemale Jr., F.
author_facet Abre, P.
Cingolani, Carlos Alberto
Cairncross, B.
Chemale Jr., F.
author_sort Abre, P.
title Whole-rock and isotope geochemistry of Ordovician to Silurian units of the Cuyania terrane, Argentina: insights for the evolution of SW Gondwana margin
title_short Whole-rock and isotope geochemistry of Ordovician to Silurian units of the Cuyania terrane, Argentina: insights for the evolution of SW Gondwana margin
title_full Whole-rock and isotope geochemistry of Ordovician to Silurian units of the Cuyania terrane, Argentina: insights for the evolution of SW Gondwana margin
title_fullStr Whole-rock and isotope geochemistry of Ordovician to Silurian units of the Cuyania terrane, Argentina: insights for the evolution of SW Gondwana margin
title_full_unstemmed Whole-rock and isotope geochemistry of Ordovician to Silurian units of the Cuyania terrane, Argentina: insights for the evolution of SW Gondwana margin
title_sort whole-rock and isotope geochemistry of ordovician to silurian units of the cuyania terrane, argentina: insights for the evolution of sw gondwana margin
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/153692
work_keys_str_mv AT abrep wholerockandisotopegeochemistryofordoviciantosilurianunitsofthecuyaniaterraneargentinainsightsfortheevolutionofswgondwanamargin
AT cingolanicarlosalberto wholerockandisotopegeochemistryofordoviciantosilurianunitsofthecuyaniaterraneargentinainsightsfortheevolutionofswgondwanamargin
AT cairncrossb wholerockandisotopegeochemistryofordoviciantosilurianunitsofthecuyaniaterraneargentinainsightsfortheevolutionofswgondwanamargin
AT chemalejrf wholerockandisotopegeochemistryofordoviciantosilurianunitsofthecuyaniaterraneargentinainsightsfortheevolutionofswgondwanamargin
_version_ 1767633994787061760

Ejemplares similares