Abstract
Measurements of hydrothermal Mn in the water column overlying the Galapagos Rift have been fitted to a one-dimensional first-order scavenging model. Assuming a vertical advection velocity of 4 m/yr, the model gives a scavenging residence time for Mn of 51 years. The horizontal propagation distance for hydrothermal Mn in the water column is thus estimated to be on the order of 1000 km. The Mg/3He injection ratios for the Galapagos Rift hydrothermal plume samples and the Red Sea brines are in close agreement. The Mn flux determined from the scavenging model and the estimates of Mn flux based on the Mg/3He injection ratio are compared to the Mn accumulation rates observed in deep-sea sediments.
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