Behavior of iron isotopes in hydrothermal systems: Beebe and Von Damm vent fields on the Mid-Cayman ultraslow-spreading ridge

Biogeochemistry of iron in coastal Antarctica: isotopic insights for external sources and biological uptake in the Amundsen Sea polynyas

“…Conversely, nonreductive dissolution (NRD) induced via particle and colloid weathering and ligand mediated dissolution, often facilitated by sediment resuspension, have been suggested to exhibit a relatively consistent isotopic signature (~+0.1 ‰, e.g., Homoky et al, 2013;Homoky et al, 2021;Radic et al, 2011) compared to RD. High temperature hydrothermal vent fluids are also fairly well constrained (-0.7 to -0.1 ‰), but chemical complications upon mixing with ocean waters lead to a wide range of vent-specific signatures (-4 to +0.5 ‰; e.g., Ellwood et al, 2015;Fitzsimmons et al, 2017;Lough et al, 2017;Wang et al, 2021). Rivers are perhaps the least well constrained (-1.3 to +1.8 ‰), with large variability in δ 56 Fe between river types and locations highly dependent on chemical conditions such as colloidal concentration, pH, and mineral compositions (Dauphas et al, 2017;Fitzsimmons and Conway, 2023).…”