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Table 4 Compilation of the average potassium (K), thorium (Th), and uranium (U) concentrations (c) and average heat production (A) based on the spectral gamma ray log for the crystalline bedrock interval between 1977 and 3697 m in DGE-1

From: Evaluation of the Lund deep geothermal exploration project in the Romeleåsen Fault Zone, South Sweden: a case study

Rock type and intervals Avg. conc. potassium, % Avg. conc. thorium, ppm Avg. conc. uranium, ppm Avg. heat production (A), μW/m3
Intervals of metabasite, amphibolite, and dolerite 1.3 12.5 15.0 5.4
Intervals of gneiss and granite 4.4 22.6 16.0 5.9
Interval: 1977–2980 m 3.6 24.8 15.9 7.6
Interval: 2980–3697 m 4.2 15.5 8.7 3.4
Complete section: 1977–3697 m 3.9 20.9 15.9 5.8