Abstract
Fe oxyhydroxide particles are formed by mixing of hot, H2S-rich, oxygen-poor, low-pH hydrothermal vent fluid with cold, oxygen-rich seawater in the hydrothermal plumes associated with seafloor hydrothermal systems. These Feoxyhydroxide particles derive their compositions from scavenging of dissolved constituents (e.g. PO4-3 V, As, rare earth elements, Th) from seawater during transport away from the vents. The scavenging processes of Fe oxyhydroxide playan important role in balancing the oceanic geochemical budgets of most rare earth elements and oxyanion species in seawater. The estimated scavenging rates are 6×1010 to 1.1×1011 tmol/year for P, 4.3×108 to 1.2×109 mol/year for V and 1.8×108 to 1.2×109 mob/year for As. These Fe oxyhydroxide particles are actively produced at the superfast-spreading (15cm/year) East Pacific Rise (EPR). During the RN Melville cruise, Fe-enriched hydrothermal plumes (Fe<730nm/l) were observed at S13°K50' to S17°00' of the East Pacific Rise (EPR). Fe-enriched plumes are dominated by Fe oxyhydroxide particles scavenging Si, P, and Ca from seawater. Room temperature Mossbauer spectra and FT-IR spectra of these Fe oxyhydroxide particles indicate that these Fe oxyhydroxide particles are dominated by ferrihydrite.
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