Polish geothermal resources are classified as low enthalpy. However, higher
temperatures are expected in the younger Paleozoic Platform characterized by
60-90 mW/m2 Heat Flow (HF). It is decreasing in North Eastern Poland reaching
40-50 mW/m2 at the old Precambrian craton.
The Paleozoic Platform (28-34 km thick) and up to 10 km thick sedimentary
cover (Guterch i Grad, 1996) is accompanied by increased HF, elevated mantle
HF, and thin thermal lithosphere of less than 100 km (Majorowicz, 2005). High
HF anomaly axis agrees with the Dolsk Fault course and the Variscides extent.
The Variscan Front lines up with increased surface gradient of HF. Rapid HF
decline correlates with Trans European Suture Zone and it is explicitly seen at
temperature cross sections below 1.5 – 2 km. The temperatures of the upper
part (less than 1.5-2 km) may be influenced by long surface temperature
changes (Gorbachev, 1995; Szewczyk and Giętka, 2003; Wróblewska and
Majorowicz, 2006). The temperature pattern at 1 and 2 km depth does not
reflect tectonic structure but a general division between the platforms
(Precambrian-cold vs. Paleozoic-warm). Deeper temperature patterns from -4
km(max. T 150 oC) and -5 km (max. T 175 oC) are in good correlation with the
course of the Variscides Front Zone occurence.
Gorbachev Y.I., 1995, Well logging. Fundamentals of methods. Chichester, NY,
Brisbane, Toronto, Singapore. J. Willey.
Guterch, A., Grad, M., 1996. Seismic structure of the Earth’s crust between
Precambrian and Variscan Europe in Poland. Publs. Inst. Geophys. Pol. Acad.
Sc., M-18 (273), 67-73.
Majorowicz J., 2004. Thermal lithosphere across the Trans-European Suture
Zone in Poland. Geological Quaterly v.48, no.1 : 1-14
Szewczyk, J. and Gientka D., 2003, Climate and climatic change from
underground temperatures: Continental energy balance, land - surface
processes, integration with meteorological and proxy data, EGS/AGU 2003
abstract CL19 and poster, EGS/AGU 2003, April, Nice, France
Wróblewska M., Majorowicz J., 2006. Thermal lithosphere model of central and
north – west Poland. Prace PIG 188: 69-76