Geofluids provides an international forum for original research into the role of fluids in mineralogical chemical and structural evolution of the Earth's crust. Its explicit aim is to disseminate ideas across the range of sub-disciplines in which Geofluids research is carried out. To this end authors will be encouraged to stress the transdisciplinary relevance of their research and to make their work as accessible as possible to readers from other sub-disciplines. Geofluids emphasizes both chemical and physical aspects of subsurface fluids throughout the Earth's crust (although excluding silicate melts). Geofluids spans studies of groundwater terrestrial or submarine geothermal fluids basinal brines petroleum metamorphic waters or magmatic fluids but requires relevance to processes that are significant on a geological time scale. Authors are encouraged to submit articles that describe theoretical or observational studies explore the geologic geochemical or geophysical attributes of subsurface fluids quantify the geologic controls on permeability geochemical transport and heat transport or document applied aspects of crustal fluid behaviour. Examples of appropriate areas for articles include but are not restricted to: composition and origins of Geofluids hydrodynamics of sedimentary basins; role of regional groundwater flow in geologic processes chemical or physical behaviour of Geofluids in porous or fractured rocks palaeohydrology of flow regimes as inferred from isotope systematics and fluid inclusion studies relations between past or present fluid flow and geothermics of the Earth's crust structural and seismic controls on deep fluid migration the role of fluids in crustal deformation role of groundwater chemistry in landscape evolution soil development and evaporite formation mechanisms of petroleum generation migration and the interaction of hydrocarbons with groundwater reactive flow in rock media fluid flow heat transport and chemical metasomatism associated with hydrothermal ores geochemistry of dissolution transport and precipitation by fluids mathematical and experimental studies of geofluid migration fluid flow accompanying metamorphism or magmatic crystallisation fluid pressure regimes in the crust.