Serpentinization of mantle peridotites has first order effects on the rheology and tectonic behavior oceanic lithosphere, global water cycle, biosphere at mid-oceanic ridges. Investigating serpentinization abyssal is limited by scarce occurrences or close to ocean floor slow ultra-slow ridge environments where peridotite exposed long-lived detachments. The processes controlling hydration upper ...

Major, minor, and trace element geochemistry as well iron oxidation state isotopes were investigated in serpentinites olivine-talc fels present along a metamorphic gradient the Bergell contact aureole (Central European Alps) to evaluate mobility during serpentine. This is an ideal target study dehydration of mantle rocks due increase temperature from greenschist facies conditions (350°C) amphib...

A field campaign targeting high pH, H2-, and CH4-emitting serpentinite-associated springs in the Zambales and Palawan Ophiolites of the Philippines was conducted in 2012-2013, and enabled description of several springs sourced in altered pillow basalts, gabbros, and peridotites. We combine field observations of pH, temperature, conductivity, dissolved oxygen, and oxidation-reduction potential w...

Purely inorganic reactions of silica, metal carbonates, and metal hydroxides can produce self-organized complex structures that mimic the texture of biominerals, the morphology of primitive organisms, and that catalyze prebiotic reactions. To date, these fascinating structures have only been synthesized using model solutions. We report that mineral self-assembly can be also obtained from natura...

Serpentinized mantle peridotites form prominent mountains, including the highest elevations of Troodos ophiolite in Cyprus (Mount Olympus, 1,952 m), but to date, only qualitative mechanisms have been proposed explain uplift rocks high altitudes. Serpentinization reactions between and water result profound changes rheology physical properties significant density reduction (∼900 kg/m3). Field obs...

The ophiolite of Sivas (Turkey) was studied in order to define the chronology different alteration events related a series serpentinization and carbonation episodes. Six samples were investigated, representative types ophicalcite (partially carbonated serpentinite). X-ray diffraction (XRD) Mössbauer spectroscopy used determine bulk mineralogy Fe 3+ /Fe tot ratio, respectively. Electron micropro...

The discovery of hydrogen-rich waters preserved below the Earth's surface in Precambrian rocks worldwide expands our understanding of the habitability of the terrestrial subsurface. Many deep microbial ecosystems in these waters survive by coupling hydrogen oxidation to sulfate reduction. Hydrogen originates from water-rock reactions including serpentinization and radiolytic decomposition of wa...