Geothermal inhomogeneity in the Hungarian Great Plain (Pannonian Basin)
Investigations tried to analyze the geothermal conditions of the Pannonian Basin by processing the thermal data obtained from deep boreholes and to explore in detail the measures of inhomogeneities and tendencies of changes. In a global sense the Pannonian Basin as a crustal structural unit can be c...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1979
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| Sorozat: | Acta mineralogica-petrographica
24 No. 1 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24649 |
| Tartalmi kivonat: | Investigations tried to analyze the geothermal conditions of the Pannonian Basin by processing the thermal data obtained from deep boreholes and to explore in detail the measures of inhomogeneities and tendencies of changes. In a global sense the Pannonian Basin as a crustal structural unit can be characterized by a gradient corresponding to the terrestrial geothermal mean value. On the basis of regional comparison, however, considerable inhomogeneity occurs characterized by higher minima and high maxima approaching the world average. Based on statistic evaluations, the extreme values of spatial changes show changes of geothermal gradient of 4 to 8 °C/100 m as a function of the geographical situation and of the depth. The reliable isotherm calculations have shown similar inhomogeneity. The measure of vertical inhomogeneity is 4.2—6.8 °C/100 m being valid of the depth interval of 650 to 2860 m, in case of the isotherms calculated to 60—140 °C. Studying the change of geothermal gradient as a function of depth four basic types can be distinguished: 1) the gradient increasing with depth, this can be approached by a straight line, 2) the gradient increasing at the beginning and decreasing later with depth, this can be approached by a sine wave, 3) the mixed gradient type of uncertain evaluation, 4) special gradients of obvious local anomalies. Having studied the areas explored by deep-bores "hot-sites" lying in minimal depth as well as "cold-sites" lying in maximal depth could be determined. The result of processing of geothermal data, which can be generalized is that the value of the average geothermal gradient unambiguously decreases in sedimentary sequence parallel with increasing depth and concerning the depth interval between 100 and 5500 m this value is 7.0—4.0 °C/100 m. |
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| Terjedelem/Fizikai jellemzők: | 137-147 |
| ISSN: | 0365-8066 |