Fig. 4: H2S vs H2 concentrations in hydrothermal vent fluids hosted in different rock types in comparison with the Jøtul fluids. | Communications Earth & Environment

Fig. 4: H2S vs H2 concentrations in hydrothermal vent fluids hosted in different rock types in comparison with the Jøtul fluids.

From: High H2 production in sediment-hosted hydrothermal fluids at an ultraslow spreading mid-ocean ridge

Fig. 4: H2S vs H2 concentrations in hydrothermal vent fluids hosted in different rock types in comparison with the Jøtul fluids.

The lines show H2/H2S ratios as produced by different rock buffers at 350 bar and temperatures denoted in the legend. “po-py: pyrrhotite-pyrite buffer (Eq. 5); “pn-hz”: pentlandite-pyrrhotite-heazlewoodite buffer (Eq. 6). Compositions of Loki’s Castle and Guaymas Basin (sediment-hosted), as well as, Rainbow and Logatchev (ultramafic-hosted) vent fluids are highlighted.

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