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Abstract:

The Baqueró Group is one of the most relevant units regarding the study of the early diversification of angiosperms in South America. Whereas the age of the upper part of the Group, namely the Punta del Barco Formation, has been recently dated at 114.67±0.18Ma, the rest of the unit still lacks precise dating. In this contribution a CA-TIMS U-Pb zircon age of 118.23±0.09Ma for a tuff interlayered with fossiliferous rocks of the Anfiteatro de Ticó Formation (lower part of the Baqueró Group) is reported. This age constrains the duration of deposition of the Baqueró Group to approximately 4Ma and provides new evidence for the age interpretation of the previously described angiosperm flora and associated pollen assemblages from this unit, until now interpreted as early Aptian or possibly Barremian in age. The Aptian age of the Baqueró Group allows a better comparison between the paleofloras from this southernmost region. © 2013 Elsevier Ltd.

Registro:

Documento: Artículo
Título:High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia
Autor:Perez Loinaze, V.S.; Vera, E.I.; Passalia, M.G.; Llorens, M.; Friedman, R.; Limarino, C.O.; Césari, S.N.
Filiación:Museo Argentino de Ciencias Naturales B. Rivadavia, Av. Ángel Gallardo 470, C1405DJR Buenos Aires, Argentina
Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Instituto de Investigaciones en Biodiversidad y Medioambiente, CONICET-UNCo, Quintral 1250, R8400FRF S.C. de Bariloche, Argentina
Comisión Nacional de Energía Atómica, Regional Patagonia, 26 de Noviembre s/n, 9100 Trelew, Chubut, Argentina
CONICET, Argentina
University of British Columbia, Department of Earth, Ocean and Atmospheric Sciences, Pacific Centre for Isotopic and Geochemical Research, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada
Palabras clave:Angiosperms; Aptian; Baqueró Group; Cretaceous; Geochronology; Paleobotany; Palynology; Patagonia; age determination; angiosperm; Aptian; fossil assemblage; geochronology; lithostratigraphy; paleobotany; palynology; precision; uranium-lead dating; zircon; Patagonia; Magnoliophyta
Año:2013
Volumen:48
Página de inicio:97
Página de fin:105
DOI: http://dx.doi.org/10.1016/j.jsames.2013.08.005
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v48_n_p97_PerezLoinaze

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Citas:

---------- APA ----------
Perez Loinaze, V.S., Vera, E.I., Passalia, M.G., Llorens, M., Friedman, R., Limarino, C.O. & Césari, S.N. (2013) . High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia. Journal of South American Earth Sciences, 48, 97-105.
http://dx.doi.org/10.1016/j.jsames.2013.08.005
---------- CHICAGO ----------
Perez Loinaze, V.S., Vera, E.I., Passalia, M.G., Llorens, M., Friedman, R., Limarino, C.O., et al. "High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia" . Journal of South American Earth Sciences 48 (2013) : 97-105.
http://dx.doi.org/10.1016/j.jsames.2013.08.005
---------- MLA ----------
Perez Loinaze, V.S., Vera, E.I., Passalia, M.G., Llorens, M., Friedman, R., Limarino, C.O., et al. "High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia" . Journal of South American Earth Sciences, vol. 48, 2013, pp. 97-105.
http://dx.doi.org/10.1016/j.jsames.2013.08.005
---------- VANCOUVER ----------
Perez Loinaze, V.S., Vera, E.I., Passalia, M.G., Llorens, M., Friedman, R., Limarino, C.O., et al. High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia. J. South Am. Earth Sci. 2013;48:97-105.
http://dx.doi.org/10.1016/j.jsames.2013.08.005