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δ 18 O SO4 and δ 34 S SO4 of pore water in the hydrothermal sites Twinkie (+), Rocky Point (●), and Spiegelei (▲), relative to the Brine pool (×), background sediments (◇), and seawater (■). The inset illustrates the potential mixing trajectory between seawater sulfate (sw) and secondary sulfate (ss).
