| Title | Fluid-Thermal Regime in the Crust-Superdeep Drilling Data |
|---|---|
| Authors | Leonid Borevsky, Svet Milanovsky and Leonid Yakovlev |
| Year | 1995 |
| Conference | World Geothermal Congress |
| Keywords | heat flow, hydrogenic dilation of rocks, metamorphic infiltration of fluids |
| Abstract | Versatile study in Kola (Baltic Shield) and Saatly (Trans-Caucasus) superdeep boreholes is presented. In both cases, hydrogeological conditions essentially determine thermal field in the upper part of the EarthÃs crust. In the Kola region, meteoric water circulation lead to intensive current cooling of the uppermost zone. In the deeper zone, hydrogenic dilation of ancient metamorphic rocks drastically changed their physical properties that manifested itself in the calculated heat flow density in depth. In the Saatly region, recently-discovered downward flow of fluids mainly controls the temperature field down to 8-10 km. The flow is with recent formation of permeable zones, which control intensity and directions of heat transfer in the studied part of the crust. |