Synchronizing the astronomical time scales in the Valanginian-Hauterivian from the Neuquén Basin (Argentina) and the Tethyan area

MARTINEZ, M.; AGUIRRE-URRETA, M.B.; LESCANO, M.; OMARINI, J.; TUNIK, M.; FREDERICHS, T.; NICKL, A.; PALIKE, H.

Congreso; 10th International Symposium on the Cretaceous; 2017

Importantdiscrepancies between the numerical ages stated by the Geological Time Scale 2016and radio-astrochronological works have been reported in the last years(AGUIRREURRETA et al., 2015; MARTINEZ et al., 2015; OGG et al., 2016). Largeuncertainties notably exist for the Valanginian-Hauterivian stages for whichthe recently provided timescales are still debated. Here, we present anastronomical calibration for the Agrio Formation (Neuquén Basin, Argentina) tobetter constraint the durations of the Valanginian and the Hauterivianstages.The formation is divided into a lower and an upper member (called Pilmatué and Aguade la Mula members, respectively) composed of marl-limestone alternationsdeposited in a semi-pelagic to outer ramp environment and related to an orbitalforcing. A rapidly (