HEAT-SOURCES, HEAT-TRANSFER AND ROCK TYPES IN THE LOWER CONTINENTAL-CRUST - INFERENCE FROM DEEP DRILLING

Structures, properties and processes below the final depth of Deep Dri lling (DD) represent important research targets (''looking ahead of th e bit''). It is shown how to derive the distribution of radioactive he at sources, the predominant heat transfer mechanism, the temperature f ield and an estimate about the petrologic nature of the crustal realm in question, i.e., between the DD bottom hole and the Moho. Large part s of the input data needed for these derivations can be acquired durin g DD site characterization and/or during DD operations. The outlined p rocedures lead to specific requirements for Deep Drilling sites.