Alpejskie fazy orogeniczne w Tatrach

Abstract

Alpine orogenic phases in the Tatra Mts.A b s t r a c t . The Alpine, orogenic phases which had shaped the Tatra Mts. are set forth. It is argued that the thrust of the Križna nappe over its High-Tatric substratum was a long-lasting and complicated process. The Križna (Lower Sub-Tatric) nappe has various High-Tatric fragments at its sole and in some places rests even on the crystalline core. The overthrusting process had taken place not only in the late Cretaceous times only but also during the Paleogene. In result of the thrust of the European substratum under the Carpathian orogen the Tatra massiv overlapped rock masses (presumably sedimentary in origin) that exhibit now very low resistance as it is shown by magneto-telluric soundings. The High-Tatric sheets were thrust in form of “flakes” (Oxburgh’s term (1972)) and not as regular fold nappes as it was argued so far. The lowermost of these “flakes” is detached from the Tatra crystalline core,contrary to previous views stating to be “autochthonous”. The higher High-Tatric units known so far as nappes are, in fact smaller or larger(?) “flakes” that have advanced one over another during the later phases of the Alpine orogeny. In many cases they contain folded parts as remnants of the initial shortening process which had taken place in pre-Coniacian times.