Preservation Factors during Cretaceous Oceanic Anoxic Events in the Espírito Santo Basin, Southeast Brazil

The oceanic anoxic events (OAEs) are characterized by enhanced accumulation of organic matter in marine sediments. However, there is still an ongoing debate regarding the interplay between production and preservation during these events. Moreover, few studies provide quantitative estimations primary productivity and/or amount carbon preserved OAEs. Here, we used geochemical data from multiple wells located at Espírito Santo Basin that cover intervals OAE1d OAE2 to estimates factors. Our results show OAEs compared modern conditions a stronger Basin. could reach up 8.6% OAE1d, depending on system. In addition, such improvement linked bottom water with low-O2 concentrations not due fast burial caused high sedimentation rates. findings extremally relevant for source rock modelling since model simulations need estimations.