Terrestrial Heat Flow In Finland

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Journal Article: Terrestrial Heat Flow In Finland

Finland is part of an ancient, Precambrian area known as the Baltic Shield. During the years 1960-1966, geothermal measurements were carried out at five points in southern and central Finland. In conjunction with these investigations, 212 temperature measurements were made in drill holes and 106 thermal conductivity determinations from core samples. In the temperature measurements, a copper wire resistance or thermistor probe and a portable Wheatstone bridge were used. The thermal conductivities were measured by a steady-state comparison method very similar to that used by birch (1950). The average temperature gradients measured in the different drill holes vary within the range of 11.0-24.6°C/km, the thermal conductivities within that of 4.3-8.0 mcal./cm sec°C and the heat flow values within that of 0.65-1.20 μcal./cm2sec. The average heat flow is 0.90 μcal./cm2-sec. The observed low heat-flow values agree well with the results of measurements made in other Precambrian shield areas. In Finland the geothermal investigations have been carried out by the Geological Survey of Finland and the Outokumpu Company.

M. Puranen, P. Jarvimaki, U. Hamalainen and S. Lehtinen

Published Journal 
Geoexploration, 1968



M. Puranen,P. Jarvimaki,U. Hamalainen,S. Lehtinen. 1968. Terrestrial Heat Flow In Finland. Geoexploration. (!) .