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Progress in Earth and Planetary Science
Fig. 4 | Progress in Earth and Planetary Science

Fig. 4

From: Cool, alkaline serpentinite formation fluid regime with scarce microbial habitability and possible abiotic synthesis beneath the South Chamorro Seamount

Fig. 4

Relationships between sulfate and alkalinity, sulfide, CH4, and pH. Filled triangles represent the CORK fluids from the present study, classified by the number of days after the valve was opened. Filled and open circles represent the CORK fluid observed in 2003 and DPW, respectively, shown for comparison. Light gray zones represent the estimated endmember formation fluid composition of the ODP porewater (DPW) or a solubility of CH4 hydrate clathrate under the SCS condition (only shown in panel c). Broken lines in panels (a), (c), and (d) represent ideal changes in the chemical composition based on selected reactions. The dark gray zone in panel (c) represents possible CH4 concentrations of the SCS formation fluid (FF) without post-drilling alteration. The solid curve in panel (b) represents sulfate consumption through CH4-SO4 reaction from the porewater-based endmember. Broken curves in panel (b) represent sulfate consumption with 10, 40, and > 112 mM of H2, in addition to the CH4-SO4 reaction

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