Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana

U-Pb sensitive high-resolution ion microprobe data together with geochemical and Nd isotope analyses obtained in the basement complex of the Sierra de la Ventana Fold Belt indicate that the Early Palaeozoic passive margin history of the basin followed Cambrian magmatism related to rifting in a 600 M...

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Autores: Rapela, Carlos Washington, Pankhurst, R. J., Fanning, C. M., Grecco, Laura Edith
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2003
País:Argentina
Recursos:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/78126
Acesso em linha:http://hdl.handle.net/11336/78126
Access Level:acceso abierto
Palavra-chave:Geochronology
Gondwana
Granites
Rifting
U-Pb Shrimp
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
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spelling Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of GondwanaRapela, Carlos WashingtonPankhurst, R. J.Fanning, C. M.Grecco, Laura EdithGeochronologyGondwanaGranitesRiftingU-Pb Shrimphttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1U-Pb sensitive high-resolution ion microprobe data together with geochemical and Nd isotope analyses obtained in the basement complex of the Sierra de la Ventana Fold Belt indicate that the Early Palaeozoic passive margin history of the basin followed Cambrian magmatism related to rifting in a 600 Ma Neoproterozoic crust. The Cambrian episode started with intrusion of 531 ± 4 and 524 ± 5 Ma A- and I-type granites derived from a dehydrated infracrustal source (cNd530 - 3.1 to -5.9), and culminated with eruption of high-Zr peralkaline spherulitic rhyolites derived from an undepleted lithospheric mantle (509 ± 5 Ma; cNd509 +0.5 to +1.0). These rift-related magmatic rocks were covered by shelf sediments deposited along a once-continuous passive margin, encompassing the Sierra de la Ventana Fold Belt, the Cape Fold Belt, the Falkland/Malvinas microplate and the Ellsworth Mountains block in Antarctica. The Cambrian rifting event defined the outline shape of the southern part of Gondwana, and can be regarded as the initiation of the supercontinent stage, which lasted until Jurassic break-up. The conjugate continental fragments separated from Gondwana during the Cambrian rifting could be the source for microcontinents with c. 1000 Ma basement rocks that collided with the proto-Andean margin during Ordovician-Silurian times.Fil: Rapela, Carlos Washington. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Pankhurst, R. J.. British Antartic Survey; Reino Unido. NERC Isotope Geosciences Laboratory; Reino UnidoFil: Fanning, C. M.. The Australian National University; AustraliaFil: Grecco, Laura Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaGeological Society Publications House2003-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/78126Rapela, Carlos Washington; Pankhurst, R. J.; Fanning, C. M.; Grecco, Laura Edith; Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana; Geological Society Publications House; Journal of the Geological Society; 160; 4; 7-2003; 613-6280016-7649CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://jgs.lyellcollection.org/content/160/4/613info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/jgs/article-lookup?doi=10.1144/0016-764902-112info:eu-repo/semantics/altIdentifier/doi/10.1144/0016-764902-112info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T14:20:51Zoai:ri.conicet.gov.ar:11336/78126instacron: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:34982024-05-08 14:20:51.747CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana
title Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana
spellingShingle Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana
Rapela, Carlos Washington
Geochronology
Gondwana
Granites
Rifting
U-Pb Shrimp
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
title_short Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana
title_full Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana
title_fullStr Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana
title_full_unstemmed Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana
title_sort Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana
dc.creator.none.fl_str_mv Rapela, Carlos Washington
Pankhurst, R. J.
Fanning, C. M.
Grecco, Laura Edith
author Rapela, Carlos Washington
author_facet Rapela, Carlos Washington
Pankhurst, R. J.
Fanning, C. M.
Grecco, Laura Edith
author_role author
author2 Pankhurst, R. J.
Fanning, C. M.
Grecco, Laura Edith
author2_role author
author
author
dc.subject.none.fl_str_mv Geochronology
Gondwana
Granites
Rifting
U-Pb Shrimp
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
topic Geochronology
Gondwana
Granites
Rifting
U-Pb Shrimp
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
description U-Pb sensitive high-resolution ion microprobe data together with geochemical and Nd isotope analyses obtained in the basement complex of the Sierra de la Ventana Fold Belt indicate that the Early Palaeozoic passive margin history of the basin followed Cambrian magmatism related to rifting in a 600 Ma Neoproterozoic crust. The Cambrian episode started with intrusion of 531 ± 4 and 524 ± 5 Ma A- and I-type granites derived from a dehydrated infracrustal source (cNd530 - 3.1 to -5.9), and culminated with eruption of high-Zr peralkaline spherulitic rhyolites derived from an undepleted lithospheric mantle (509 ± 5 Ma; cNd509 +0.5 to +1.0). These rift-related magmatic rocks were covered by shelf sediments deposited along a once-continuous passive margin, encompassing the Sierra de la Ventana Fold Belt, the Cape Fold Belt, the Falkland/Malvinas microplate and the Ellsworth Mountains block in Antarctica. The Cambrian rifting event defined the outline shape of the southern part of Gondwana, and can be regarded as the initiation of the supercontinent stage, which lasted until Jurassic break-up. The conjugate continental fragments separated from Gondwana during the Cambrian rifting could be the source for microcontinents with c. 1000 Ma basement rocks that collided with the proto-Andean margin during Ordovician-Silurian times.
publishDate 2003
dc.date.none.fl_str_mv 2003-07
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/11336/78126
Rapela, Carlos Washington; Pankhurst, R. J.; Fanning, C. M.; Grecco, Laura Edith; Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana; Geological Society Publications House; Journal of the Geological Society; 160; 4; 7-2003; 613-628
0016-7649
CONICET Digital
CONICET
url http://hdl.handle.net/11336/78126
identifier_str_mv Rapela, Carlos Washington; Pankhurst, R. J.; Fanning, C. M.; Grecco, Laura Edith; Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana; Geological Society Publications House; Journal of the Geological Society; 160; 4; 7-2003; 613-628
0016-7649
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://jgs.lyellcollection.org/content/160/4/613
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/jgs/article-lookup?doi=10.1144/0016-764902-112
info:eu-repo/semantics/altIdentifier/doi/10.1144/0016-764902-112
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
application/pdf
dc.publisher.none.fl_str_mv Geological Society Publications House
publisher.none.fl_str_mv Geological Society Publications House
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
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 15.811543

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