Sedimentogenesis of Early Maykop (Lower Oligocene) deposits in the Azov-Black Sea region

: pp. 63 - 74
Received: March 01, 2016
Institute of Geology and Geochemistry of Combustible Minerals of the National Academy of Science of Ukraine
Institute of Geology and Geochemistry of Combustible Minerals of National Ukrainian Academy of Sciences

Purpose. Research of lithological features of the sedimentary complex of Early Oligocene within Azov-Black Sea Region and reconstruction of its sedimentary conditions. Method. The method includes lithologo-facial, mineralo-petrographic, lithmological, electrofacial and sedimento-paleooceanographycal analyses. Results. It is established, lithological structure of section and lithologo-facial zonality of the Lower Oligocene (Lower Maykop) of Karkinite-North Crimean and Indolo-Kubanian depressions. Four type of series was distinguished, what differing of containing in their structure of clastogene (sandstone, siltstone) lithotypes, spatial distribution which is characterized by a certain lateral zonality, that represent built lithologo-facial models. In detail the petrographic features of the main rock types are studied. Lithmological sections were built, which allowed establish the layered structure of the section thickneses, what resulting in the development of two regional and local clastogene bands, separated pelitomorphic formations. Sedimento-paleooceanographic situation of basal clastogene band were reconstructed and proper models were built. Two sedimentation basins with different dynamics and depositional environments are distinguished: internal Odessa-Kerch (close, estuary, northern) and exernal Black Sea (open, southern) which separated by the Kilian-Kalamitian-Crimean-Caucasian range of submarine-surface elevations. In the exernal, in the open for the oceanic water Black Sea sedimentation basin, the near shore-marine conditions were predominant, with accumulation of clayey, aleuritic-clayey and aleuritic muds of facial zones: “shelf plain”, “along shore bar” and “fan”. In the internal, in the close Odessa sedimentation basin, the near shore-marine and alluvial-deltaic sedimentary environment prevailed. Throwing down of the detritic material provided for the four river systems, which drainaged present areas of West (Moldovian paleoland) and Northern Black Sea, forming psammitic-aleuritic node bodies of facial zones: “river bed”, “river mouth bar”, “fan”, and which were separated, , formed to the axian zones of the consedimentation uplift, by the bodies of facial zone “along shore bar”. Scientific novelty. First, the result of complexes litogenetic researches, was reconstructed situation of sedimentation of basal clastogene band of the Lower Oligocene within the Azov-Black Sea Region. Practical significance. Study of features of lithological strata structure, creation of the sedimentation models will be instrumental to clarify of certain question of stratum character, finding out spatial distribution of sedimentary bodies of different composition and genesis. Which will be geological basis for more grounded prognosis of prospective oil and gas objects spatial distribution.

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