Radiocarbon and geochemical data of sediment core CF10-09A, Cabo Frio upwelling system, SE Brazilian margin

This dataset presents radiocarbon and geochemical records from sediment core CF10-09A, collected in the Cabo Frio upwelling system on the southeastern Brazilian continental margin (23.20°S, 41.74°W; 117 m water depth). The data were generated to evaluate radiocarbon age offsets between organic carbon (OC) and carbonate fractions and to support Holocene paleoceanographic reconstructions in a dynamic coastal upwelling environment.