Climate-driven hydrological change and carbonate platform demise induced by the Paleocene–Eocene Thermal Maximum (southern Pyrenees)

The Campo section in the Spanish Pyrenees is classical for shallow-water Paleocene-Eocene Thermal Maximum (PETM) studies. Despite extensive work last decades, stratigraphic location of onset negative carbon isotope excursion (CIE), and hence Paleocene/Eocene (P/E) boundary, remains a matter considerable debate section. Here we present new biostratigraphic, sedimentological carbon-isotopic data across late Paleocene to Eocene strata constrain precise position P/E boundary investigate environmental changes PETM. Foraminiferal assemblages biozone SBZ4 found below Claret Formation are replaced by SBZ6 above. Detailed microfacies analysis indicated that pre-PETM upper Navarri represents transgressive inner-ramp deposits, overlain unconformably mixed carbonate-siliciclastic deposits syn-PETM Formation, turn renewed carbonate-ramp deposition post-PETM lower Serraduy Formation. temporary demise carbonate ramp during PETM ascribed increased siliciclastic supply associated with significant change regional hydrology driven an increase magnitude frequency extreme rainfall runoff events.