Uniquely low stable iron isotopic signatures in deep marine sediments caused by Rayleigh distillation.

ABSTRACT: Dissimilatory iron reduction (DIR) is suggested to be one of the earliest forms of microbial respiration. It plays an important role in the biogeochemical cycling of iron in modern and ancient sediments. Since microbial iron cycling is typically accompanied by iron isotope fractionation, stable iron isotopes are used as tracer for biological activity. Here we present iron isotope data for dissolved and sequentially extracted sedimentary iron pools from deep and hot subseafloor sediments retrieved in the Nankai Trough off Japan. Dissolved iron (Fe(II)_aq) is isotopically light throughout the ferruginous sediment interval but some samples have exceptionally light isotope values. Such light values have never been reported in natural marine environments and cannot be solely attribute

SUBMITTER: Koster M 

PROVIDER: S-EPMC10290645 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature