The Malvinas (Falkland) Islands revisited: The tectonic evolution of southern Gondwana based on U-Pb and Lu-Hf detrital zircon isotopes in the Paleozoic cover

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The first U-Pb and Hf-Lu isotopic data of detrital zircons from Devonian strata of the Malvinas (Falkland) Islands allow re-evaluation of different hypotheses regarding their location before the breakup of Gondwana. Of the various published hypotheses there are only two that have gained support. Adi...

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Autor principal: Ramos, V.A
Otros Autores: Cingolani, C., Junior, F.C, Naipauer, M., Rapalini, A.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: Elsevier Ltd 2017
Acceso en línea:Registro en Scopus
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Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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100 1 |a Ramos, V.A. 
245 1 4 |a The Malvinas (Falkland) Islands revisited: The tectonic evolution of southern Gondwana based on U-Pb and Lu-Hf detrital zircon isotopes in the Paleozoic cover 
260 |b Elsevier Ltd  |c 2017 
270 1 0 |m Ramos, V.A.; Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), CONICET, Universidad de Buenos AiresArgentina; email: andes@gl.fcen.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a The first U-Pb and Hf-Lu isotopic data of detrital zircons from Devonian strata of the Malvinas (Falkland) Islands allow re-evaluation of different hypotheses regarding their location before the breakup of Gondwana. Of the various published hypotheses there are only two that have gained support. Adie's hypothesis involves a rotation of 180 degrees of the islands and a large displacement of Patagonia, independently of South America, whereas Borrello's hypothesis assumes a relative fixed position of the islands with respect to South America over time. The first hypothesis has traditionally been evaluated by highlighting the similarities of the geology of the Malvinas Islands with similar rocks cropping out in South Africa. In this paper we test those hypotheses that led to correlate the islands with the Cape System, based on geological, paleomagnetic and geochronological data. However, new isotopic data compared with contemporaneous Patagonian rocks, together with the present knowledge of offshore features of the Malvinas Plateau, suggest that its correlation with South Africa is not as compelling. Although there is no conclusive evidence, the simplest hypothesis based on the present available datasets, favors a closer relationship with Patagonia. No doubt that more research is needed in order to elucidate the paleogeography of the Malvinas Islands before the opening of the South Atlantic Ocean. © 2017 Elsevier Ltd  |l eng 
536 |a Detalles de la financiación: Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq, 445416/2014-9 
536 |a Detalles de la financiación: 199 
536 |a Detalles de la financiación: British Geological Survey, BGS 
536 |a Detalles de la financiación: St. Francis Xavier University 
536 |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas 
536 |a Detalles de la financiación: The authors would like to thank the reviewers Dr. Philip Stone of the British Geological Survey, UK, and Prof. Brendan Murphy of the St. Francis Xavier University, Canada, for their excellent constructive comments on the manuscript. We also thank the IDEAN for the logistic support and the CONICET for funding part of authors (PIP-CONICET grant 199 to C.C. and the CNPq grant 445416/2014-9 to FCJ), as well as to many colleagues of the Institute for the interesting discussions through the years, and suggestions received on an earlier version of this paper. This is the contribution R-192 of the Instituto de Estudios Andinos Don Pablo Groeber (IDEAN, UBA-CONICET). 
593 |a Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), CONICET, Universidad de Buenos Aires, Argentina 
593 |a División Geología, Museo de la Plata and Centro de Investigaciones Geológicas (CONICET-UNLP), Universidad Nacional de La Plata, Argentina 
593 |a Programa de Pós-Graduação em Geologia, Universidade do Vale do Rio dos Sinos, São Leopoldo, RS, Brazil 
593 |a Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), CONICET, Universidad Nacional de La Plata, Argentina 
593 |a Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), CONICET, Universidad de Buenos Aires, Argentina 
690 1 0 |a BLOCK ROTATION 
690 1 0 |a DETRITAL ZIRCONS 
690 1 0 |a MALVINAS (FALKLAND) PLATEAU 
690 1 0 |a PALEOGEOGRAPHY 
690 1 0 |a PATAGONIA 
690 1 0 |a U-PB AND LU-HF ISOTOPES 
690 1 0 |a DETRITAL DEPOSIT 
690 1 0 |a GONDWANA 
690 1 0 |a HAFNIUM 
690 1 0 |a ISOTOPIC ANALYSIS 
690 1 0 |a LUTETIUM 
690 1 0 |a PALEOGEOGRAPHY 
690 1 0 |a PALEOZOIC 
690 1 0 |a TECTONIC EVOLUTION 
690 1 0 |a URANIUM-LEAD DATING 
690 1 0 |a ZIRCON 
690 1 0 |a FALKLAND ISLANDS (MALVINAS) 
690 1 0 |a PATAGONIA 
700 1 |a Cingolani, C. 
700 1 |a Junior, F.C. 
700 1 |a Naipauer, M. 
700 1 |a Rapalini, A. 
773 0 |d Elsevier Ltd, 2017  |g v. 76  |h pp. 320-345  |p J. South Am. Earth Sci.  |x 08959811  |w (AR-BaUEN)CENRE-1080  |t Journal of South American Earth Sciences 
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856 4 0 |u https://doi.org/10.1016/j.jsames.2016.12.013  |y DOI 
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