HEAT FLOW WITHIN LOCAL INTERSYNCLINAL STRUCTURES OF THE TORTOISE-SHELL TYPE AND SALT DOMES WITHIN THE PRIPYAT TROUGH. Zhuk M.S., Tsalko P.B., Zui V.I. Institute of Geological Sciences, NAS of Belarus, Minsk, Belarus.

Salt tectonics is widely developed within the Pripyat Trough. It produces contrast terrestrial temperature field and heat flow density distribution within intersynclinal local structures of the so-called “tortoise-shell type ”, as well as within salt domes and swells. Observed heat flow values are dependent both on the depth interval considered and on the salt structure geometry. The paper describes interval heat flow density estimates for different boreholes of the Pripyat Trough drilled both within salt structures and within intersynclinal areas. In contrast to increased heat flow within salt domes and swells, their low to normal background values were observed within local intersynclinal structures. The highest heat flow corresponds to cap rock deposits, which frequently exhibit an indication of their increased permeability, as well as in the uppermost parts of salt domes. The role of hydrogeologic conditions, salt tectonics, and mineralogical composition of rocks within the platform cover is discussed.