Serpentinization reactions produce highly reduced waters that have hyperalkaline pH and can high concentrations of H 2 CH 4 . Putatively autotrophic methanogenic archaea been identified in the subsurface Samail Ophiolite, Sultanate Oman, though strategies to overcome dissolved inorganic carbon limitation remain be fully understood. Here, we recovered metagenome assembled genomes (MAGs) applied ...

Seismic anisotropy measurements show that upper mantle hydration at the Middle America Trench (MAT) is limited to serpentinization and/or water in fault zones, rather than distributed uniformly. Subduction of hydrated oceanic lithosphere recycles back into deep mantle, drives arc volcanism, and affects seismicity subduction zones. Constraining extent an important part understanding many fundame...

Hydrocarbons such as CH4 are known to be formed through the Fischer-Tropsch or Sabatier type reactions in hydrothermal systems usually at temperatures above 100°C. Weathering of olivine is sometimes suggested to account for abiotic formation of CH4 through its redox lowering and water splitting properties. Knowledge about the CH4 and H2 formation processes at low temperatures is important for t...

International Ocean Discovery Program (IODP) Expedition 357 drilled 17 shallow sites distributed ~10 km in the spreading direction (from west to east) across Atlantis Massif oceanic core complex (Mid-Atlantic Ridge, 30°N). Mantle exposed footwall of is predominantly nearly wholly serpentinized harzburgite with subordinate dunite. Altered peridotites are subdivided into three types: (I) serpenti...