_18. Knothe C., Wal ther K.- F. - Deep ~lsmic so1ind~ng in the German Democratic Republic. Ibidem.
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1'70
SUMMARY-The international profile VII intersects one of the most important tectonic lines of Europe - the co.ntact between the Old European Platform and Variscan 1Hercynian) orogen. In Poland the profile intersects tW() zones of the orogen - external and Internal, corresponding to the Saxo-Thuring.j.an and Rheno-Hercynian zones from the area of Germany. A marked difference in the character of lower part of Earth crust of these zones _ was noted. The in-ternal zone is characterized by more homogenized physical model of the crust, which is related to in-tense translocations of magma in iofra- and supra-structures. In
turn,
the exter·nal zone is characteri-zed by the development of a tr8lJlSitional zone at the boundary between the Earth crust and upper man-tle, as wellas
by a .zone of reduced velocities (low velocity channel) marked in granitic-gneiss layer of the crust, which is accompanied by an increase of thermal gradient. Such chuacteristics seems to· be typical of external zones of other European orogens. The externides and intem1des of the Variscan orogen are separated by fault z.one with large am-plitude of downthrust. The nature of this zone sug-gests overthrust of the internides on externides. Block F1 situated between the Variscan oragen and·Old European Platform, appears to be depressed. Maximum subsidence took here place in post-Vari-scan, and possibly pre-Variacan and post-Baikalian times .
The physical model of the crust
of
Old European Platform appears to be analogous to that of Varis-can internides. Marginal block Ft is characterized by the crust thinning out towards the periphery of the platform, i.e. towards the area of remarkable subsi-- dence in the Phanerozoic times, presumably relatedto subcrusta! corrosion. The development of the Mid-Polish aulacogen at the margin of the platform du,ring the Mesozoic appears related to these
pheno-mena. .
The block F, corresponding to the Old Platform markedly differs from the areas of post-Gothia~
-geosynclines in the character of Earth crust struc-ture. Coincidence of boundaries of the blocks with boundaries of units characterized .by homogeneous magnetic field seems to support the rift origin of the margin of the Old Platform, related to break down and translocations of pracontfnents, previously suggested by the present author.
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