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Alpejskie fazy orogeniczne w Tatrach

Lefeld L.

Przegląd Geologiczny

2009

Vol. 57, nr 8

669-673

The Alpine, orogenic phases which had shaped the Tatra Mts. are set forth. It is argued that the thrust of the Krina nappe over its High-Tatric substratum was a long-lasting and complicated process. The Krina (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.

Magnetotelluric studies of the East-European Craton and adjacent regions

Bubnov V.P., Yakovlev A.G., Aleksanova E.D., Yakovlev D.V., Berdichevsky M.N., Pushkarev P.Yu.

Acta Geophysica

2007

Vol. 55, no. 2

154-168

Magnetotelluric method is widely applied to study the Russian part of the East-European Craton, as well as the Caucasus and the Urals: several thousand soundings were performed during the last few years. Their periods range is approximately from 0.003 to 3000 seconds, which allows to study the sedimentary cover and the consolidated crust. Resistivity cross-sections along several regional profiles which run across the tectonic structures of the East-European Craton and the adjacent folded systems were obtained, mainly using 1D and 2D interpretational tools. MT investigations provided important information about the structure and reservoir properties of sedimentary complexes, the state of active geodynamic regions, the graphitization and fluid regime of the consolidated crust, and the perme-able and fluid-saturated crustal zones.