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Table 2 Heat production of crystalline rocks at Fang

From: Geologic framework of the Fang Hot Springs area with emphasis on structure, hydrology, and geothermal development, Chiang Mai Province, northern Thailand

Sample no. Rock type Th (ppm) U (ppm) K (%) Heat production (µW m)−3
KK-FANG-1 Orthogneiss 17.5 3.3 2.14 2.26
KK-FANG-2 Mylonite 27.6 6.5 3.30 3.89
MS-82Y2501 Mylonite 15.1 11.4 4.31 4.38
IT-FANG-1 Foliated biotite granite 19.9 6.5 3.60 3.38
IT-FANG-4 Biotite granite 32.4 8.9 3.67 4.87
Average      3.75
  1. Sample numbers and analysis are from Kawada et al. (1987)
  2. Heat production (A, µW m−3) calculation uses the formula from Jaupart et al. (2016): A = 0.257[U] + 0.069[Th] + 0.094[K], where U and Th are in ppm, and K is in % by weight