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The purpose of this research is to characterize the mobilization and immobilization processes that control the authigenic accumulation of uranium (U), rhenium (Re), and molybdenum (Mo) in marine sediments. We analyzed these redox-sensitive metals (RSM) in benthic chamber, pore water, and solid phase samples at a site in Buzzards Bay, Massachusetts (USA) that has high bottom water oxygen concentrations (230–300μmol/L) and high organic matter oxidation rates (390μmol C/cm²/y). The oxygen penetration depth varies from 2 to 9mm below the sediment-water interface, but pore water sulfide is below detection (<2μM). The RSM pore water profiles are modeled with a steady-state diagenetic model that includes irrigation, which extends 10–20cm below the sediment-water interface. To present a consistent description of trace metal diagenesis in marine sediments, RSM results from sediments in Buzzards …