Uranium isotope geochemistry in modern coastal sediments: Insights from Toulon Bay, France

The U isotopic data (δ238U), which are the first reported for the coastal hypoxic sediments of Toulon Bay, average −0.12 ± 0.12‰ in surface sediments. However, sediments situated in front of river mouths show higher values of δ238U (up to +0.75‰); these high values are reported for the first time in sediments below an oxic water column.