Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of Gondwana

Wereport the first study integrating in situ U–Pb and Hf isotope data frommagmatic zircon andwhole-rock Sm–Nd isotope data for granitic rocks of the Sierras Pampeanas, Argentina, in order to evaluate the Palaeozoic growth of the proto-Andean margin of Gondwana. Early–Middle Ordovician granitic magma...

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Authors: Dahlquist, Juan A., Pankhurst, R.J., Gaschnig, Richard M., Rapela, Carlos W., Casquet Martín, César, Galindo Francisco, María Del Carmen, Alasino, Pablo H., Baldo, Edgardo G.
Format: article
Publication Date:2013
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/34130
Online Access:https://hdl.handle.net/20.500.14352/34130
Access Level:Open access
Keyword:552.3
U–Pb dating
Hf and Nd isotopes
Zircon
Crustal growth
Proto-Andean margin of Gondwana
Petrología
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spelling Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of GondwanaDahlquist, Juan A.Pankhurst, R.J.Gaschnig, Richard M.Pankhurst, R.J.Rapela, Carlos W.Casquet Martín, CésarGalindo Francisco, María Del CarmenAlasino, Pablo H.Baldo, Edgardo G.552.3U–Pb datingHf and Nd isotopesZirconCrustal growthProto-Andean margin of GondwanaPetrologíaWereport the first study integrating in situ U–Pb and Hf isotope data frommagmatic zircon andwhole-rock Sm–Nd isotope data for granitic rocks of the Sierras Pampeanas, Argentina, in order to evaluate the Palaeozoic growth of the proto-Andean margin of Gondwana. Early–Middle Ordovician granitic magmatism is by far the most voluminous of the Sierras Pampeanas and represents the most significant magmatic event. These calc-alkaline granitoids were intruded at an active continental margin. εHft values range from −3.3 to −14.7 and εNdt from −3.3 to −6.3 (t=473 Ma), with average TDM Hf and TDM Nd ranging from 1.5 to 2.2 Ga and 1.4 to 1.7 Ga, respectively. Middle–Late Devonian magmatism occurred in the foreland, away from the orogenic front in the west, and included F-U-REE rich A-type granites. The Achala granite, the largest batholith in the Sierras Pampeanas, has εHft and εNdt values ranging from −3.6 to −5.8 and −4.0 to −6.5, respectively (t=369 Ma). Small scattered Early Carboniferous A-type granite plutons were intruded in a dominantly extensional setting and have εHft and εNdt values ranging from−6.7 to+2.2 and−0.5 to−3.6, respectively (t=341 Ma). The generation of Ordovician and Devonian magmas dominantly involved crustal reworking and stabilization rather than the formation of new continental crust by juvenile material accretion, whereas carboniferous magmatism resulted in part from reworking of supracrustal material, but with variable addition of juvenile magmas.Elsevier Science B. V., AmsterdamUniversidad Complutense de Madrid20132013-01-0120132013-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/34130reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttps://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/341302026-06-02T12:44:21Z
dc.title.none.fl_str_mv Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of Gondwana
title Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of Gondwana
spellingShingle Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of Gondwana
Dahlquist, Juan A.
552.3
U–Pb dating
Hf and Nd isotopes
Zircon
Crustal growth
Proto-Andean margin of Gondwana
Petrología
title_short Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of Gondwana
title_full Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of Gondwana
title_fullStr Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of Gondwana
title_full_unstemmed Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of Gondwana
title_sort Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of Gondwana
dc.creator.none.fl_str_mv Dahlquist, Juan A.
Pankhurst, R.J.
Gaschnig, Richard M.
Pankhurst, R.J.
Rapela, Carlos W.
Casquet Martín, César
Galindo Francisco, María Del Carmen
Alasino, Pablo H.
Baldo, Edgardo G.
author Dahlquist, Juan A.
author_facet Dahlquist, Juan A.
Pankhurst, R.J.
Gaschnig, Richard M.
Rapela, Carlos W.
Casquet Martín, César
Galindo Francisco, María Del Carmen
Alasino, Pablo H.
Baldo, Edgardo G.
author_role author
author2 Pankhurst, R.J.
Gaschnig, Richard M.
Rapela, Carlos W.
Casquet Martín, César
Galindo Francisco, María Del Carmen
Alasino, Pablo H.
Baldo, Edgardo G.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 552.3
U–Pb dating
Hf and Nd isotopes
Zircon
Crustal growth
Proto-Andean margin of Gondwana
Petrología
topic 552.3
U–Pb dating
Hf and Nd isotopes
Zircon
Crustal growth
Proto-Andean margin of Gondwana
Petrología
description Wereport the first study integrating in situ U–Pb and Hf isotope data frommagmatic zircon andwhole-rock Sm–Nd isotope data for granitic rocks of the Sierras Pampeanas, Argentina, in order to evaluate the Palaeozoic growth of the proto-Andean margin of Gondwana. Early–Middle Ordovician granitic magmatism is by far the most voluminous of the Sierras Pampeanas and represents the most significant magmatic event. These calc-alkaline granitoids were intruded at an active continental margin. εHft values range from −3.3 to −14.7 and εNdt from −3.3 to −6.3 (t=473 Ma), with average TDM Hf and TDM Nd ranging from 1.5 to 2.2 Ga and 1.4 to 1.7 Ga, respectively. Middle–Late Devonian magmatism occurred in the foreland, away from the orogenic front in the west, and included F-U-REE rich A-type granites. The Achala granite, the largest batholith in the Sierras Pampeanas, has εHft and εNdt values ranging from −3.6 to −5.8 and −4.0 to −6.5, respectively (t=369 Ma). Small scattered Early Carboniferous A-type granite plutons were intruded in a dominantly extensional setting and have εHft and εNdt values ranging from−6.7 to+2.2 and−0.5 to−3.6, respectively (t=341 Ma). The generation of Ordovician and Devonian magmas dominantly involved crustal reworking and stabilization rather than the formation of new continental crust by juvenile material accretion, whereas carboniferous magmatism resulted in part from reworking of supracrustal material, but with variable addition of juvenile magmas.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-01-01
2013
2013-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/34130
url https://hdl.handle.net/20.500.14352/34130
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
https://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
https://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier Science B. V., Amsterdam
publisher.none.fl_str_mv Elsevier Science B. V., Amsterdam
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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