Artículo
High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiospermdiversification in Patagonia
Perez Loinaze, Valeria Susana
; Vera, Ezequiel Ignacio
; Passalia, Mauro Gabriel
; Llorens, Magdalena
; Friedman, Richard; Limarino, Carlos Oscar
; Cesari, Silvia Nelida
Fecha de publicación:
08/2013
Editorial:
Elsevier
Revista:
Journal of South American Earth Sciences
ISSN:
0895-9811
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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 ± 0.18 Ma, the rest of the unit still lacks precise dating. In this contribution a CA-TIMS U–Pb zircon age of 118.23 ± 0.09 Ma 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 4 Ma 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.
Palabras clave:
Cretaceous
,
Aptian
,
Palynology
,
Paleobotany
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Articulos(CCT-CENPAT)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Articulos(IGEBA)
Articulos de INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BS. AS
Articulos de INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BS. AS
Articulos(INIBIOMA)
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Articulos(MACNBR)
Articulos de MUSEO ARG.DE CS.NAT "BERNARDINO RIVADAVIA"
Articulos de MUSEO ARG.DE CS.NAT "BERNARDINO RIVADAVIA"
Citación
Perez Loinaze, Valeria Susana; Vera, Ezequiel Ignacio; Passalia, Mauro Gabriel; Llorens, Magdalena; Friedman, Richard; et al.; High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiospermdiversification in Patagonia; Elsevier; Journal of South American Earth Sciences; 48; 8-2013; 97-105
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