Early diagenesis and benthic fluxes of redox-sensitive metals in eastern China shelf sediments

Thirteen Short sediment cores (30-50 cm) were collected from Bohai Sea, Yellow Sea and Changjiang Estuary in China, the early diagenesis of several redox sensitive metals (Fe, Mn, Mo, U V, referring to as RSMs) studied. The recycling process Mo Mn was closely correlated with each other, generating benthic fluxes diffusing upward overlying water column, flux rates are related organic carbon oxidation rates. V more tightly coupled Fe oxides, going downward into most cores. Significant authigenic accumulation U, contrary little no found study region, even where hypoxic condition often during summer. Benthic diffusive compared mass accumulate (MAR), which indicated that, besides diffusion process, there other processes controlling RSMs. close relationships between RSMs OC burial S , indicating is a consequence environment shelf sediment, directly influencing degradation process. Compared continental margin, moderate enrichment China sediment. BS NYS sediments accounted for 20 - 68% River input, whilst SYS ~ 64% acting important sinks that cannot be ignored.