Mantle heat flow and geotherms for major tectonic units in central Europe |
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| Authors: | Jacek Majorowicz |
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| Institution: | (1) Geophysical Department, Geological Institute, Rakowiecka 4, 02-519 Warsaw, Poland |
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| Abstract: | The results of seismic measurements along the deep seismic sounding profile VII and terrestrial heat flow measurements used for construction of heat generation models for the crust in the Paleozoic Platform region, the Sudetic Mountains (Variscan Internides) and the European Precambrian Platform show considerable differences in mantle heat flow and temperatures. At the base of the crust variations from 440–510°C in the models of Precambrian Platform to 700–820°C for the Paleozoic Platform and the Variscan Internides (Sudets) are found. These differences are associated with considerable mantle heat flow variations.The calculated models show mantle heat flow of about 8.4–12.6 mW m–2 for the Precambrian Platform and 31 mW m–2 to 40.2 mW m–2 for Paleozoic orogenic areas. The heat flow contribution originating from crustal radioactivity is almost the same for the different tectonic units (from 33.5 mW m–2 to 37.6 mW m–2). Considerable physical differences in the lower crust and upper mantle between the Precambrian Platform and the adjacent areas, produced by lateral temperature variations, could be expected. On the basis of  carbon ratio data it can be concluded that the Carboniferous paleogeothermal gradient was much lower in the Precambrian Platform area than in the Paleozoic Platform region. |
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| Keywords: | Crustal geotherms Moho temperatures Heat flow and crustal thickness Heat flow-age relationship Coalification rank Tectonic units in Poland Heat flow transition zones |
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