Abstract
During the February response cruise to Axial Volcano, methane and hydrogen concentrations within the plume were significantly elevated above background. CH4/³He ratios were found to be 5–10 times greater than previously reported values for unsedimented ridges. An average δ13C value of −32.7±0.8‰ was determined for CH4 concentrations >10 nM and CH4/Mn ratios were determined to be 2.2. Hydrogen concentrations as high as 183 nM were measured; however most were <10 nM. Microbial oxidation of methane was negligible (<0.001 day−1) during this sampling period. However, microbial hydrogen oxidation was sufficient to explain decreased H2 concentrations measured at ‘older’ downstream stations.
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