Isotopic and kinetic constraints on methane origins in Icelandic hydrothermal fluids

This dataset is accompanying with the manuscript "Isotopic and kinetic constraints on methane origins in Icelandic hydrothermal fluids". It contains analytical data on carbon species concentrations and hydrogen, helium, carbon and oxygen isotope compostion of hydrothermla fluids. The data were used in the study to constain the origin of methane in hydrothermal fluids in Iceland. Data are provided as a Word file.