Over the last 30 years, geochemical research has demonstrated that abiotic methane (CH4),
formed by chemical reactions which do not directly involve organic matter, occurs on Earth in …

The aqueous alteration of ultramafic rocks through serpentinization liberates mantle carbon
and reducing power. Serpentinization occurs in numerous settings on present day Earth …

Geologic molecular hydrogen (H 2) occurs in the subsurface and vents and seeps at the
surface. However, this valuable natural resource is under-utilized in the economy because …

Saturn's moon, Enceladus, is a geologically active waterworld. The prevailing paradigm is
that there is a subsurface ocean that erupts to the surface, which leads to the formation of a …

Microbial abundance and diversity in deep subsurface environments is dependent upon the
availability of energy and carbon. However, supplies of oxidants and reductants capable of …

This paper proposes a comparative study of reduced gas seepages occurring in ultrabasic
to basic rocks outcropping in ophiolitic complexes based on the study of seepages from …

Ultra-basic (pH 11–12) reducing (− 656 to− 585mV) groundwater springs discharging from
serpentinized peridotite of The Cedars, CA, were investigated for their geochemistry and …

Abiotic gaseous hydrocarbons comprise a fascinating, but poorly understood, group of Earth
fluids generated by magmatic and gas–water–rock reactions that do not directly involve …

Hyperalkaline waters display unusually high productivity, which makes them prime targets in
the search for life elsewhere in the solar system. However, the formation mechanisms of …

The Cedars, in coastal northern California, is an active site of peridotite serpentinization. The
spring waters that emerge from this system feature very high pH, low redox potential, and …