Fig. 5.

Influence of particulate scavenging and mineral precipitation on DFe and δ⁵⁶Fe fractionation. (A) Depth profiles of DFe concentration and δ⁵⁶Fe for samples collected adjacent to the Brothers underwater volcano. Error bars are the same as in Fig. 2. (B) Open and closed system Rayleigh fractionation modeling (47) of δ⁵⁶Fe values using A for samples collected adjacent to the Brothers underwater volcano, where F is the fraction of DFe remaining relative to a DFe concentration of 8.31 nmol⋅kg⁻¹. The closed system model produces an α_scav = −0.67‰ while the open system model produces an α_scav = −1.62.