Twenty-four heat flow determinations based on measurements in lakes are presented from southern Norway. All the measurements Iie within the Precambrian Baltic Shield and the Permian Oslo Graben. The mean value, 0.96 ± 0.21 hfu (1 hfu = 10-6 cal/cm2s), is in good agreement with previously published results from both Norway and the Baltic Shield in general. The results give additional evidence in favour of the suggested presence of a zone of anomalous low mantle heat flow to the east of the Caledonian mountains in Norway.
Terrestrial heat flow determinations from lakes in southern Norway