Summary
A comparative study is presented of granitic groundwaters from the Hvaler islands, southeastern Norway (11 samples) and the Scilly islands, southwestern England (10 samples). The islands display similar bulk lithologies and land use, but differing glaciation and hence weathering histories. The groundwater of both groups bears a strong marine signature, although the Hvaler islands display less marine influence and a greater degree of water-rock interaction. The most interesting hydrochemical dissimilarities concern the health related trace elements Rn,U and F.
