To calculate thermal conductivity, we derived the following ‘bulk crustal’ specific heat capacity equations from end-member mineral data 16, on the basis of a mineralogy of 30% quartz ...

t k = 0'01576 1—0'0019.t - These results show practically no change of thermal conductivity with-temperature for basalt and marble. For rock salt, anhydrite of Jura, and quartz, they show ...