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Alta investigates the influence of geochemical gradients on microbial community composition. The geochemical gradient imposed by the mixing between serpentinization reacted water in the Semail ophiolite of Oman and surrounding surface waters provides an opportunity to find correlations between community composition and varying concentrations of methane, hydrogen, organic carbon, ammonium, sulfide, magnesium, inorganic carbon, nitrate, sulfate and varying pH, from circumneutral to hyperalkaline (pH>10).