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dc.contributor.author
Rapela, Carlos Washington
dc.contributor.author
Pankhurst, R. J.
dc.contributor.author
Fanning, C. M.
dc.contributor.author
Grecco, Laura Edith
dc.date.available
2019-06-12T19:35:30Z
dc.date.issued
2003-07
dc.identifier.citation
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
dc.identifier.issn
0016-7649
dc.identifier.uri
http://hdl.handle.net/11336/78126
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Geological Society Publications House
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Geochronology
dc.subject
Gondwana
dc.subject
Granites
dc.subject
Rifting
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U-Pb Shrimp
dc.subject.classification
Geología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Basement evolution of the Sierra de la Ventana Fold Belt: New evidence for Cambrian continental rifting along the southern margin of Gondwana
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-05-23T17:41:30Z
dc.journal.volume
160
dc.journal.number
4
dc.journal.pagination
613-628
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
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; Argentina
dc.description.fil
Fil: Pankhurst, R. J.. British Antartic Survey; Reino Unido. NERC Isotope Geosciences Laboratory; Reino Unido
dc.description.fil
Fil: Fanning, C. M.. The Australian National University; Australia
dc.description.fil
Fil: 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; Argentina
dc.journal.title
Journal of the Geological Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://jgs.lyellcollection.org/content/160/4/613
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/jgs/article-lookup?doi=10.1144/0016-764902-112
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1144/0016-764902-112


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