The structure of the earth's crust and the heat-flow—heat-generation relationship in the Bohemian Massif

The relationship between terrestrial heat flow and heat generation of rocks was examined in the region of Proterozoic crystalline schists (Crystalinicum) of the Bohemian Massif at 18 sites. It has been shown that it is not possible to fit a single straight line to the heat-flow—heat-generation plot for the whole area investigated. It is necessary to consider for different parts of the Bohemian Massif how the different values of the heat flow q₀, originating at greater depths, influence the measured surface value q. In the paper it is explained that different values of q₀ are not caused by different heat flow through the M-discontinuity but predominantly by the different fabric of the lower crust.