Abstract
The distribution of dissolved gases in the near-bottom water layer over the submarine volcanoes of the Epi caldera in the New Hebrides off northeastern Australia is widespread. Maximum contents of methane and carbon dioxide in the near-bottom layer were as high as 440 nl/liter and 1.1 ml/liter, respectively. Composition and anomalous concentrations of hydrocarbon gases (C1−C5) suggest a thermogenic source and an inflow from surrounding sediment. Accumulation of carbon dioxide is connected with fumarolic activity of the Epi-b Volcano.
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