Geophysical Journal | 2015 volume 37 6

The nature of inclined seismic boundary in the Earth crust of the Scythian plate along the DOBRE-5 profile

© L.V. Farfulyak, 2015

Amplifying volumetric seismic tectonic model of the Scythian plate has been plotted; structural- high-speed element - sloping seismic boundary along the DOBRE-5 profile has been revealed. Its location has been defined more precisely and possible mechanisms of formation have been proposed: it corresponds to the northern border of the Early Permian active over-thrust or thrust edge of southern dip and of formation of front-rank molassa sag, the so-called Euxinian orogenic belt or the North Crimean suture formed by the closure of the Paleo-Tethys Ocean in the late Paleozoic-Triassic, subduction of the East-European platform under the Scythian plate southward and their collision. On the surface Pre-Cretaceuos basement of the North Crimean suture can be traced as Golitsyn and Azov fault zones usually considered as the border between East-European platform and Scythian plate. Dipping seismic border is a listric surface that falls to the south-southeast, with angles in the longitudinal intersection, α= 17°, and in sections perpendicular to the East-European platform and Scythian plate, α= 22 to 38°. This inclination of the DSB is close to the dip of the South-Crimean suture zone that was previously assumed by Yudin V.V.

Key words: Scythian plate, high-speed model, the Earth crust, tectonics, geodynamics, inclined seismic boundary.

<<back |