Finding a VOICE in the Southern Hemisphere: A new record of global organic carbon?

Variations in the carbon isotopic composition of carbonate and organic (?13Ccarb ?13Corg) are generally used to record perturbations global cycle, which turn closely linked changes climate. However, because climate gradients on Earth, assignment “global” signal ancient records is not straightforward. Here, we report ?13C values material Upper Jurassic Lower Cretaceous sedimentary Vaca Muerta Formation, situated Neuquén Basin, Argentina, show similar patterns those observed several northern latitude basins. This differs from measured early Atlantic Ocean, a previously considered be representative carbon. As result synchronicity both southern latitudes, suggest that these may represent rather than proto?Atlantic Ocean. The components slight initial decrease ?2‰ Tithonian (149?145 Ma) then another before reaching minimum ?30.29‰ late (145?143 Ma), followed by gradual increasing trend throughout Berriasian (143.1?137.7 Ma). Valanginian (137.7?135.5 was marked more substantial increase up ?23.46‰. These mirror seen Northern Hemisphere locations during Late Early Cretaceous, where this perturbation has been termed Volgian excursion (VOICE). difference between Ocean Basin interpreted gradient at time, characterized humid conditions high latitudes compared dry basin.