Highlights:1. MOR vent fluids show the largest range of δ 138/134 Ba seen so far in marine systems.2. Endmember vent fluid δ 138/134 Ba values are the same as those of the source rocks.3. Barite precipitation leads to high δ 138/134 Ba values in vent fluids as they evolve.4. Hydrothermal Ba input may explain non-conservative δ 138/134 Ba seen in deep waters.5. Hydrothermal input contributes 3-9% of the Ba in some Atlantic deep waters.
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