Rare earth element distributions in the Arabian Sea reveal the influence of redox processes within the oxygen deficient zone

The Arabian Sea is a dynamic system driven by intense monsoon cycling, water mass interactions, and persistent oxygen deficient zone (ODZ). It has been an area of much interest due to high primary productivity with the potential act as major source climatically important gases, nitrous oxide dimethylsulfide, sink for fixed nitrogen. Trace metal geochemistry influenced complex physics biology within Sea, inputs from continental margins that surround it on three sides. Rare earth elements (REE) manganese have studied transect through during southwest in 2007. Fractionation REE series (especially cerium) comparison previously published iron data show importance redox gradients ODZ transport margin. Shale-normalized patterns entire reveal aeolian deposition, but also some dust may significantly altered weathering before implications other metals. Hydrographic data, slightly positive europium anomaly, Fe Mn give evidence hydrothermal input Gulf Aden. Interactions between hydrothermally-derived, shelf-driven, deposition make difficult ascertain directly, there supporting all three.