This allows an assessment of the relative magma source melting at depth: Bárdarbunga above the assumed centre of the Iceland mantle plume produces basalts formed by highest degree of melting whereas the smallest melt fraction is recorded in the Kverkfjöll basalts erupted farther away from the assumed plume centre.
Bárðarbunga, sem er staðsett yfir miðju möttulstróksins myndar basalt sem einkennist af mestu hlutfalli bráðar en Kverkfjallabasalt, sem myndast mun lengra frá áætlaðri miðju möttulstróksins, einkennist af mun minni bráðnun.