“…On land, interaction of meteoric water with peridotites results in Mg-HCO 3 waters, which in the absence of a CO 2 source, progressively evolve to hyperalkaline Ca 21 -OH waters [Bruni et al, 2002;Boschetti and Toscani, 2008;Marques et al, 2008]. Despite presumably low reaction temperatures in the basement (50-100 C, as no heat source has been observed in any of the continental serpentinization sites), high methane and/or hydrogen concentrations were measured in the Voltri Massif, Italy [Cipolli et al, 2004], the Zambales Ophiolite, Philippines [Abrajano et al, 1988[Abrajano et al, , 1990, in the Newfoundland Ophiolite, Canada [Szponar et al, 2012], in the Samail Ophiolite, Oman [Neal and Stanger, 1983], and in the Othrys Ophiolite, Greece [Etiope et al, 2013].…”