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V.A. Viginsky (Russia)

Neotectonics of Black Sea and surroundings

 

During compiling "Neotectonic Map of Northern EurasiaĽ (editor-in-chief A.F.Grachev) author built a map of Black Sea vertical amplitudes of neotectonic moves. The tectonic modes were selected: platform, orogenic and "deep-sea basin" mode. Orogens in a surrounding of the Black Sea were learnt later. Two their types are selected: collisional (the Strandja-massive, Pontides, Central&Little Caucasus Syntax, Western Crimea) and Cober orogens (Balkan, Eastern Crimea, Northwest Caucasus). The orogens of last type were formed above flysch compensation troughs of Cretaceous rear basin island arcs as a result of isostatic up-floating light flysch stratas. For collisional orogens twinning of an earth-crust is characteristic. Mechanics of its uplifting also is an isostatic nature. Itís caused by earth-crust augmented thicknesses in their limits testify to it. "Deep-sea basin" mode caused by compensational movements in a result of lateral flows mantle material towards the deficit areas under circum Black Sea orogens.

Last years the inner structure of Black Sea northeast part sedimentary stratas was subjected to close learning. The vertical amplitudes of the neotectonic moves in this area were minimized, however, intensity of deformations were high enough. The applying of tectonofacial analysis has allowed learning conditions of forming of stratas caused by extended horizontal tectonic stream of Tuapse trough Maycop clays aslope of the Black Sea trough. It has given in forming mud volcano, progressing turbidities during late Miocene-Pliocene, intensive deformation of stratas and, thereof, - to making favorable conditions for oil-gas bearing.