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Table 3 Compilation of thermal conductivity and density measured on cutting samples from FFC-1 and bedrock samples from Dalby quarry on the Romeleåsen Ridge

From: Evaluation of deep geothermal exploration drillings in the crystalline basement of the Fennoscandian Shield Border Zone in south Sweden

Sample Rock type Thermal conductivity (W/mK) Density (kg/dm3) Specific heat capacity (J/kgK)
FFC-1     At 30 °C/100 °C
2771–2774 ma Grey–light red-pinkish, quartz-rich gneiss, with < 5% of mafic rocks 3.85 ± 0.05 2.657 ± 0.02 770/877
2873–2875 ma Grey and light red gneiss with < 10% mafic rocks 3.95 ± 0.03 2.656 ± 0.02 765/865
2954–2956 ma Banded, grey and light red gneiss with < 15% mafic rocks 3.10 ± 0.03 2.694 ± 0.03 770/877
3098–3100 ma Amphibolite/metabasite with < 10% amphibolite gneiss and grey–red gneiss 2.54 ± 0.02 2.994 ± 0.03 778/880
3104–3106 ma Metabasite/amphibolite gneiss < 5% grey–red gneiss 2.59 ± 0.02 2.969 ± 0.02 776/879
Dalby quarry, outcrop sampleb Red orthogneiss, fine, foliated 3.55 ± 0.10 2.617 ± 0.05 n/a
-“-b -“-, massive, fine, granitic 3.23 ± 0.10 2.622 ± 0.05 n/a
-“-b -“-, medium, foliated, biotitic 3.46 ± 0.10 2.619 ± 0.05 n/a
-“-b Light red–grey, orthogneiss, fine 3.58 ± 0.10 2.616 ± 0.05 n/a
-“-b Red orthogneiss, medium, weakly foliated 3.52 ± 0.10 2.628 ± 0.05 n/a
-“-b Amphibolite 2.38 ± 0.10 2.960 ± 0.05 n/a
-“-b Amphibolite 2.16 ± 0.10 2.908 ± 0.05 n/a
  1. Specific heat capacity measured at 30 °C and 100 °C on the cuttings from FFC-1 is also presented
  2. aCuttings sample analysed by Klitzsch and Ahrensmeier (2021)
  3. bRock sample from outcrop analysed by the Geological Survey of Sweden