Zr, Hf and gas concentrations in volcanic fumarole fluids

Here temperatures of fumarole fluids, Zr, Hf, HCl, HF concentrations, and derived parameters are reported from volcanic fumaroles at Vulcano, Phlegrean Fields, Fogo Island (Capo Verde), and Tenerife island (Spain). Sample collection took place between 2012 and 2014.