Using an interdisciplinary approach, this paper reviews current knowledge in the field of
natural hydrogen. For the first time, it combines perspectives on hydrogen from the literature …

Volatiles are the fuel and fundamental control for major processes involving magmas and
volcanoes, including magma ascent, magma convection and mixing, magma differentiation …

The capacity for molecular hydrogen (H2) to hydrogenate oxygen and carbon is critical to
the origin of life and represents the basis for all known life-forms. Major sources of H2 that …

Volcanic eruptions are common, with more than 50 volcanic eruptions in the United States
alone in the past 31 years. These eruptions can have devastating economic and social …

Various proxies and numerical models have been used to constrain O 2 levels over
geological time, but considerable uncertainty remains. Previous investigations using 1-D …

The fumarolic gas output has not been quantified for any of the currently deforming calderas
worldwide, due to the lack of suitable gas flux sensing techniques. In view of resumption of …

We review the state of knowledge on global volcanogenic Hg emissions to the atmosphere
and present new data from seven active volcanoes (Poás, Rincón de la Vieja, Turrialba …

Portable gas analyzers have become a powerful tool for the real-time monitoring of volcanic
gas composition over the last decade. Gas analyzers make it possible to retrieve in real-time …

Natural hydrogen (H 2) has the potential to be a low-carbon fuel and energy source, playing
a crucial role in achieving a clean, secure, and affordable energy future. However, our …

Molecular hydrogen (H 2) is among the main components in hydrothermal fluids and exerts
a major role in geochemical and biological processes. Nevertheless, the understanding and …