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Abstract:

The U-Pb and Lu-Hf isotopic analyses of the different sedimentary sequences of the Ventania System, an old Paleozoic orogenic belt exposed in the southern region of the Río de la Plata Craton in the province of Buenos Aires, Argentina, provide new evidence for the understanding of the tectonic evolution of the western sector of the Gondwanides mountain belt. These ranges formed as result of the late Paleozoic collision of the Patagonia terrane against the continental margin of Gondwana. The provenance analysis together with the sedimentary paleocurrents confirm a dominant source from the Tandilia System, a Paleoproterozoic mountain belt formed during the amalgamation of the Río de la Plata Craton at about 1800-2200. Ma, and incorporated to Western Gondwana during the Brasiliano Orogeny at 550-530. Ma. The local dominant source at the base of the early Paleozoic changed to more distant supplies toward the top of the sequences, when an increasing participation of detritus from first, Cambrian (560-520. Ma) zircons from the Pampean Orogen, and later on Ordovician (480-460. Ma) zircons from the Famatinian Orogen is recorded. The detrital zircon patterns and the maximum age of the units shed light on some previous discrepancies in the early Paleozoic stratigraphy. The Balcarce Formation, an early Paleozoic sedimentary cover of the Tandilia metamorphic and igneous basement, shows striking differences when compared with the new data from the Ventania System. The two data-sets reveal different sources for the two regions. The late Paleozoic foreland basin deposits mark an abrupt change of 180° in the paleocurrent directions, in the petrographic composition of the sediments, and in the provenance of detrital zircons. These data indicate a southern provenance with the first evidence of Carboniferous and Permian magmatic zircons. The oldest Archean zircons together with the finding of clasts with archeocyathids support the provenance from Patagonia, which was derived from Eastern Gondwana. The U-Pb ages of the ash-fall tuffs in the Tunas Formation confirm the Early Permian age of the Eurydesma Fauna in the Ventania System. The U-Pb data together with the Lu-Hf isotopic data enhance the comprehension of the tectonic evolution of the Ventania System as part of the larger Gondwanides Belt that amalgamated to Western Gondwana during Late Permian times with some independent pieces derived from Eastern Gondwana. © 2013 International Association for Gondwana Research.

Registro:

Documento: Artículo
Título:A provenance study of the Paleozoic Ventania System (Argentina): Transient complex sources from Western and Eastern Gondwana
Autor:Ramos, V.A.; Chemale, F.; Naipauer, M.; Pazos, P.J.
Filiación:Instituto de Estudios Andinos Don Pablo Groeber, Universidad de Buenos Aires and CONICET, Argentina
Instituto de Geociências, Universidade de Brasília, Brasília-DF 70904-970, Brazil
Palabras clave:Collision; Eurydesma Fauna; Famatinian and Pampean belts; Gondwanides; Patagonia
Año:2014
Volumen:26
Número:2
Página de inicio:719
Página de fin:740
DOI: http://dx.doi.org/10.1016/j.gr.2013.07.008
Título revista:Gondwana Research
Título revista abreviado:Gondwana Res.
ISSN:1342937X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v26_n2_p719_Ramos

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Citas:

---------- APA ----------
Ramos, V.A., Chemale, F., Naipauer, M. & Pazos, P.J. (2014) . A provenance study of the Paleozoic Ventania System (Argentina): Transient complex sources from Western and Eastern Gondwana. Gondwana Research, 26(2), 719-740.
http://dx.doi.org/10.1016/j.gr.2013.07.008
---------- CHICAGO ----------
Ramos, V.A., Chemale, F., Naipauer, M., Pazos, P.J. "A provenance study of the Paleozoic Ventania System (Argentina): Transient complex sources from Western and Eastern Gondwana" . Gondwana Research 26, no. 2 (2014) : 719-740.
http://dx.doi.org/10.1016/j.gr.2013.07.008
---------- MLA ----------
Ramos, V.A., Chemale, F., Naipauer, M., Pazos, P.J. "A provenance study of the Paleozoic Ventania System (Argentina): Transient complex sources from Western and Eastern Gondwana" . Gondwana Research, vol. 26, no. 2, 2014, pp. 719-740.
http://dx.doi.org/10.1016/j.gr.2013.07.008
---------- VANCOUVER ----------
Ramos, V.A., Chemale, F., Naipauer, M., Pazos, P.J. A provenance study of the Paleozoic Ventania System (Argentina): Transient complex sources from Western and Eastern Gondwana. Gondwana Res. 2014;26(2):719-740.
http://dx.doi.org/10.1016/j.gr.2013.07.008