The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina

Autores
Chernicoff, Carlos Jorge; Zappettini, Eduardo Osvaldo; Santos, João O. S.; Allchurch, Shelley; McNaughton, Neal J.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The present study led to the identification of a largely hidden southern segment of the Famatinian magmatic arc in the province of La Pampa, south-central Argentina. The arc is represented by scarce outcrops of metaigneous rocks (mostly meta-quartz-diorites and metagabbros) but stands out in the aeromagnetic data as a conspicuous and continuous, NNW-trending magnetic anomaly. The geochemical signature of this magmatic suite points to a pre-collisional continental magmatic arc. Its crystallization age (U-Pb SHRIMP dating on magmatic zircon) ranges from ca. 476 to 466 Ma, being comparable, therefore, to the central and northern segments of the Famatinian arc. All dated zircon of the metagabbro have similar 176Hf/177Hf ratios, negative eHf (from - 5.02 to - 3.62) and average Lu-Hf model ages of ca. 1.7 Ga, indicating a crustal contamination of a mantle-derived mafic magma (of ca. 466 Ma) with much older rocks, probably older than 2 Ga, hence suggesting that part of the underlying basement of the southernmost Pampia terrane is at least this old. U-Pb SHRIMP dating on metamorphic zircon rims/areas yielded ca 454 Ma, that is within the 465-450 Ma age range of Famatinian metamorphism previously recorded in La Pampa. The amphibolite-facies metamorphism that affects the magmatic arc in La Pampa is attributed to the collision of the Cuyania (greater Precordillera) terrane against the western margin of Gondwana.
Fil: Chernicoff, Carlos Jorge. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Zappettini, Eduardo Osvaldo. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
Fil: Santos, João O. S.. University of Western Australia; Australia
Fil: Allchurch, Shelley. Macquarie University; Australia
Fil: McNaughton, Neal J.. University of Western Australia; Australia
Materia
AEROMAGNETICS
ARGENTINA
FAMATINIAN MAGMATIC ARC
HF ISOTOPES
LA PAMPA
U-PB SHRIMP
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/188409
Acceder
id CONICETDig_9009453a049f665b0345a3e3ef072502
oai_identifier_str oai:ri.conicet.gov.ar:11336/188409
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling The southern segment of the Famatinian magmatic arc, La Pampa province, ArgentinaChernicoff, Carlos JorgeZappettini, Eduardo OsvaldoSantos, João O. S.Allchurch, ShelleyMcNaughton, Neal J.AEROMAGNETICSARGENTINAFAMATINIAN MAGMATIC ARCHF ISOTOPESLA PAMPAU-PB SHRIMPhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The present study led to the identification of a largely hidden southern segment of the Famatinian magmatic arc in the province of La Pampa, south-central Argentina. The arc is represented by scarce outcrops of metaigneous rocks (mostly meta-quartz-diorites and metagabbros) but stands out in the aeromagnetic data as a conspicuous and continuous, NNW-trending magnetic anomaly. The geochemical signature of this magmatic suite points to a pre-collisional continental magmatic arc. Its crystallization age (U-Pb SHRIMP dating on magmatic zircon) ranges from ca. 476 to 466 Ma, being comparable, therefore, to the central and northern segments of the Famatinian arc. All dated zircon of the metagabbro have similar 176Hf/177Hf ratios, negative eHf (from - 5.02 to - 3.62) and average Lu-Hf model ages of ca. 1.7 Ga, indicating a crustal contamination of a mantle-derived mafic magma (of ca. 466 Ma) with much older rocks, probably older than 2 Ga, hence suggesting that part of the underlying basement of the southernmost Pampia terrane is at least this old. U-Pb SHRIMP dating on metamorphic zircon rims/areas yielded ca 454 Ma, that is within the 465-450 Ma age range of Famatinian metamorphism previously recorded in La Pampa. The amphibolite-facies metamorphism that affects the magmatic arc in La Pampa is attributed to the collision of the Cuyania (greater Precordillera) terrane against the western margin of Gondwana.Fil: Chernicoff, Carlos Jorge. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Zappettini, Eduardo Osvaldo. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; ArgentinaFil: Santos, João O. S.. University of Western Australia; AustraliaFil: Allchurch, Shelley. Macquarie University; AustraliaFil: McNaughton, Neal J.. University of Western Australia; AustraliaElsevier Science2010-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/188409Chernicoff, Carlos Jorge; Zappettini, Eduardo Osvaldo; Santos, João O. S.; Allchurch, Shelley; McNaughton, Neal J.; The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina; Elsevier Science; Gondwana Research; 17; 4; 5-2010; 662-6751342-937XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S1342937X09002081info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2009.10.008info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:48:29Zoai:ri.conicet.gov.ar:11336/188409instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:48:30.081CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina
title The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina
spellingShingle The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina
Chernicoff, Carlos Jorge
AEROMAGNETICS
ARGENTINA
FAMATINIAN MAGMATIC ARC
HF ISOTOPES
LA PAMPA
U-PB SHRIMP
title_short The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina
title_full The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina
title_fullStr The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina
title_full_unstemmed The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina
title_sort The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina
dc.creator.none.fl_str_mv Chernicoff, Carlos Jorge
Zappettini, Eduardo Osvaldo
Santos, João O. S.
Allchurch, Shelley
McNaughton, Neal J.
author Chernicoff, Carlos Jorge
author_facet Chernicoff, Carlos Jorge
Zappettini, Eduardo Osvaldo
Santos, João O. S.
Allchurch, Shelley
McNaughton, Neal J.
author_role author
author2 Zappettini, Eduardo Osvaldo
Santos, João O. S.
Allchurch, Shelley
McNaughton, Neal J.
author2_role author
author
author
author
dc.subject.none.fl_str_mv AEROMAGNETICS
ARGENTINA
FAMATINIAN MAGMATIC ARC
HF ISOTOPES
LA PAMPA
U-PB SHRIMP
topic AEROMAGNETICS
ARGENTINA
FAMATINIAN MAGMATIC ARC
HF ISOTOPES
LA PAMPA
U-PB SHRIMP
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The present study led to the identification of a largely hidden southern segment of the Famatinian magmatic arc in the province of La Pampa, south-central Argentina. The arc is represented by scarce outcrops of metaigneous rocks (mostly meta-quartz-diorites and metagabbros) but stands out in the aeromagnetic data as a conspicuous and continuous, NNW-trending magnetic anomaly. The geochemical signature of this magmatic suite points to a pre-collisional continental magmatic arc. Its crystallization age (U-Pb SHRIMP dating on magmatic zircon) ranges from ca. 476 to 466 Ma, being comparable, therefore, to the central and northern segments of the Famatinian arc. All dated zircon of the metagabbro have similar 176Hf/177Hf ratios, negative eHf (from - 5.02 to - 3.62) and average Lu-Hf model ages of ca. 1.7 Ga, indicating a crustal contamination of a mantle-derived mafic magma (of ca. 466 Ma) with much older rocks, probably older than 2 Ga, hence suggesting that part of the underlying basement of the southernmost Pampia terrane is at least this old. U-Pb SHRIMP dating on metamorphic zircon rims/areas yielded ca 454 Ma, that is within the 465-450 Ma age range of Famatinian metamorphism previously recorded in La Pampa. The amphibolite-facies metamorphism that affects the magmatic arc in La Pampa is attributed to the collision of the Cuyania (greater Precordillera) terrane against the western margin of Gondwana.
Fil: Chernicoff, Carlos Jorge. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Zappettini, Eduardo Osvaldo. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
Fil: Santos, João O. S.. University of Western Australia; Australia
Fil: Allchurch, Shelley. Macquarie University; Australia
Fil: McNaughton, Neal J.. University of Western Australia; Australia
description The present study led to the identification of a largely hidden southern segment of the Famatinian magmatic arc in the province of La Pampa, south-central Argentina. The arc is represented by scarce outcrops of metaigneous rocks (mostly meta-quartz-diorites and metagabbros) but stands out in the aeromagnetic data as a conspicuous and continuous, NNW-trending magnetic anomaly. The geochemical signature of this magmatic suite points to a pre-collisional continental magmatic arc. Its crystallization age (U-Pb SHRIMP dating on magmatic zircon) ranges from ca. 476 to 466 Ma, being comparable, therefore, to the central and northern segments of the Famatinian arc. All dated zircon of the metagabbro have similar 176Hf/177Hf ratios, negative eHf (from - 5.02 to - 3.62) and average Lu-Hf model ages of ca. 1.7 Ga, indicating a crustal contamination of a mantle-derived mafic magma (of ca. 466 Ma) with much older rocks, probably older than 2 Ga, hence suggesting that part of the underlying basement of the southernmost Pampia terrane is at least this old. U-Pb SHRIMP dating on metamorphic zircon rims/areas yielded ca 454 Ma, that is within the 465-450 Ma age range of Famatinian metamorphism previously recorded in La Pampa. The amphibolite-facies metamorphism that affects the magmatic arc in La Pampa is attributed to the collision of the Cuyania (greater Precordillera) terrane against the western margin of Gondwana.
publishDate 2010
dc.date.none.fl_str_mv 2010-05
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/188409
Chernicoff, Carlos Jorge; Zappettini, Eduardo Osvaldo; Santos, João O. S.; Allchurch, Shelley; McNaughton, Neal J.; The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina; Elsevier Science; Gondwana Research; 17; 4; 5-2010; 662-675
1342-937X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/188409
identifier_str_mv Chernicoff, Carlos Jorge; Zappettini, Eduardo Osvaldo; Santos, João O. S.; Allchurch, Shelley; McNaughton, Neal J.; The southern segment of the Famatinian magmatic arc, La Pampa province, Argentina; Elsevier Science; Gondwana Research; 17; 4; 5-2010; 662-675
1342-937X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S1342937X09002081
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2009.10.008
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.260194

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