Geothermal flow and phenomena in two Swedish localities north of the Arctic circle

Summary. Temperature measurements in eight holes reaching vertical depths between 287 and 1 lOOm below ground surface in the Malmberget area (lat. 67 " lO'N, long. 20"46'E Gr.) and the Kiruna area (lat. 67 " 52'N, long. 20 " 9 ' E Gr.) in the Swedish Precambrian are reported. The mean equilibrium heat flow in this part of the Swedish shield after climatic correction is 52.6 f 1.7 mW m-2. The mean uncorrected heat flow is 46.6 mW m-2. Comparison with other shield areas shows that in common with the S. African and Indian shields, the north Swedish shield has a greater heat flow than the remaining shield areas of the world.