Uranium isotope variations in a dolomitized Jurassic carbonate platform (Tithonian; Franconian Alb, Southern Germany)

The samples with the most depleted δ238U values have high Mo concentrations and low Re/Mo ratios. As carbonate sediments are generally Mo poor, the high Mo concentrations suggests that the depleted δ238U values might be linked to a manganese cycle that operated across the sediment-water interface during the deposition of this Jurassic carbonate platform.