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Maximum temperatures and average pore water δ 34 S SO4 for discrete samples collected 5 to 20 cm below the sediment water interface at hydrothermal sites (a) Twinkie, (b) Rocky Point, and (c) Spiegelei. The color of the surficial sediments varied from orange/yellow, white, and gray. δ34SSO4 decreased as temperatures increased toward the center of each feature.
