INVESTIGADORES
TUNIK Maisa Andrea
congresos y reuniones científicas
Título:
Astrochronology of the Agrio Formation (Neuquén Basin, Argentina): toward an intercalibration of the ammonite zones in the Early Cretaceous.
Autor/es:
MARTINEZ, MATHUIEU; AGUIRRE URRETA, MARIA BEATRIZ; LESCANO, MARINA; OMARINI, JULIETA; TUNIK, MAISA; FREDERICHS, THOMAS; NICKL, ANNA; PÄLIKE, HEIKO
Lugar:
Paris
Reunión:
Workshop; Réunion thématique 2016 du Groupe Français du Crétacé; 2016
Institución organizadora:
Groupe Français du Crétacé
Resumen:
Interbasinal correlations at high resolution require the precise definition of the chronological relationships between the biostratigraphic markers, from a faunal province to another. In the Early Cretaceous, the Kilian Group tends to establish correlation charts between the Andean and the Tethyan ammonite zones (Reboulet et al., 2014). Attempts to provide durations and numerical ages of the ammonite zones in the Valanginian and the Hauterivian stages have been made, based on cyclostratigraphy in the Tethyan area (Martinez et al., 2015), and on the U-Pb method on volcanic ashes in the Neuquén Basin (Aguirre-Urreta et al., 2015). Because of the scarcity of ash layers in the Tethyan area, the durations calculated for the ammonite zones cannot be anchored on numerical ages without correlations with the Andean series. Conversely, the Andean series have not been dated by cyclostratigraphy. The hemipelagic sediments of the Neuquén Basin in the Upper Valanginian-Hauterivianform the Agrio Formation. This formation is composed of marl-limestone alternations, likely forced by the orbital cycles (Sagasti, 2005).