Eastern Azov Research Articles

Нові дані про ультрабазити Маріупольського залізорудного родовища (Східне Приазов’я)

Нові дані про ультрабазити Маріупольського залізорудного родовища (Східне Приазов’я)

Ta-Nb Mineralization in the Alkaline Rocks of the Eastern Azov Sea Area (Ukraine)

Ta-Nb Mineralization in the Alkaline Rocks of the Eastern Azov Sea Area (Ukraine)

Reconstruction of Late Pleistocene events in the periglacial area in the southern part of the East European Plain

An integrated study of the loess–soil sequence in the coastal exposure near the settlement of Beglitsa (Rostov oblast) allowed us, for the first time, to reconstruct the landscape-climatic changes that occurred in the eastern Azov region over the course of the Late Pleistocene. In the south of the periglacial zone, considerable differences between intensity of the loess accumulation in the Early and Late Valdai Cryochrons were revealed. In the Early Valdai Epoch, which corresponds roughly to the end of Marine Isotope Stage (MIS) 5 and MIS 4, loess accumulation occurred after completion of development of the Mezin pedocomplex and before the beginning of the Bryansk stage of soil development, i.e., over more than 20 000 years. In the much shorter Late Valdai Cryochron MIS 2 (10 000–12 000 years), loess accumulation reached 5 m. The data evaluation shows that the loess accumulation rates in the Early Valdai Epoch (~0.07 mm/year) and the Late Valdai Epoch (~0.5 mm/year) differ from each other by an order of magnitude.

Magnetic field and dike belts of eastern Azov block of the Ukrainian shield

The article analyzes the pattern of displaying of the geological structure of the Eastern Azov region in a magnetic field. The anomalous magnetic field is separated on regional and residual components. The quantitative analysis of the anomalous magnetic field and their components to allocate magnetic-lineaments for the study area was done. Geochemical properties of the dyke rocks and their relation to the magnetization are given. It is demonstrated, the result of magnetic modeling of the Maloyanisolsky and of the Kamennomogilsky dyke swarms of Eastern Azov area.

A COMPARATIVE ANALYSIS OF CHANGING SEDIMENTATION CONDITIONS DURING THE LAST INTERGLACIAL-GLACIAL MACROCYCLE IN THE LOESS AREAS OF THE SOUTHERN EAST EUROPEAN PLAIN (THE AZOV SEA REGION) AND CENTRAL CHINA (LOESS PLATEAU)

Multi-proxy studies of loess-soil sequences in the eastern Azov Sea region (Beglitsa‑2 section) and the northwestern Loess Plateau of China (Caoxian section) let us to suggest the correlation of the main stratigraphic horizons and to provide the comparison of landscape and climatic changes in these regions during the last interglacial-glacial climatic macrocycle. It was found that the Loess Plateau was characterized by a steady accumulation of loess during both glacial and interglacial epochs, when the so-called “warm” loess was formed. In the NE Sea of Azov region, the main loess accumulation corresponded to cryoarid conditions of the glacial phases, while during the interglacials, loess accumulation became ten times slower. The average sedimentation rate of loess material calculated for Caoxian section was more than 5 times higher than the one calculated for the Beglitsa‑2 section. Late Pleistocene paleosoils in the Beglitsa‑2 section are of the steppe type and correspond to the Salyn (MIS5e), Krutitsa (MIS5c), and Bryansk (MIS3) climate phases. Morphology of the Azov paleosoils is much better expressed than that of the paleosoils at Caoxian, where only the S1SS3 semidesert paleosoil (MIS5e) can be seen directly in the section. Climatic fluctuations in the southern East European Plain within the last interglacial-glacial macrocycle had significantly greater amplitude than that in the north-west of the Loess Plateau. In the latter, cryoarid glacial conditions alternated with warm semiarid interglacial conditions. In the northwestern Loess Plateau, the main climate dynamics was associated with the hydrological regime changes under the influence of the East Asian monsoon activity, which was at its lowest during the glacial stages (drier climatic phases) and increased during the interglacial and interstadials (wetter climatic phases).

GEOCHEMICAL FEATURES OF METABASITE OF PAVLOVKA AND ZELENIY GAY GREENSTONE STRUCTURE OF EASTERN AZOV (UKRAINIAN SHIELD)

Pavlovka and Zeleniy Gay greenstone structure different from other greenstone structures of Azov megablock lack of ultramafic volcanics. Metabasites of Pavlovka GS related to the tholeiitic series and discover the trend of iron enrichment and metabasites of Zeleniy Gai – belong to calc-alkaline series. From bottom to top in the section in the metabasites of metatoleite formation of Pavlovka GS increases iron, titaniferous content and rare earth elements and reduced alumina content. Metabasites of lower parts of metatoleitick formation belongs to the type N-MORB and the top – to the type E-MORB. The latter differ of Nb positive anomaly (Nb/Nb* = 1,35). Metabasites of Zeleniy Gay GS among the most leucocratic varieties mafic potassium and related to the type of calc-alkaline basalts. It has been much more content of Rb, Sr, Ba, REE, Th, Pb and smaller – Ni, Cr and V. Metabasites of Pavlovka and Zeleniy Gay greenstone structures of the Eastern Azov formed from magma plume sources (ΔNb = +0,03ч0,43). The presence in a cross-sectional Zeleniy Gay andesites may indicate their formation in island-arc regime unlike rift greenstone structures of West-Priazov block.

О возможности использования геоэлектрических исследований для поисков и прогноза редкометально-редкоземельного оруденения в Восточном Приазовье

О возможности использования геоэлектрических исследований для поисков и прогноза редкометально-редкоземельного оруденения в Восточном Приазовье

Zincian micas from peralkaline phonolites of the Oktyabrsky massif, Azov Sea region, Ukrainian Shield

Hendricksite, Zn-Mn-bearing fluorophlogopite and phlogopite were observed in the groundmass of two types of peralkaline phonolite from the Oktyabrsky massif, eastern Azov Sea region, Ukraine. These micas are associated with nepheline, potassium feldspar, albite, sodalite, Zn-bearing kupletskite, aegirine, perraultite, fluorite, catapleiite, serandite, REE -rich eudyalite, fluorapatite, fluorbritholite-(Ce), a pyrochlore-group mineral, cryolite, thorite, thorianite and a mineral of the cancrinite group. Fine-grained phonolite from the Oktyabrsky massif represents the first known occurrence of hendricksite in peralkaline igneous rocks. This mica is variable in composition (in wt%): SiO 2 (37.7–38.7), TiO 2 (up to 0.3), Al 2 O 3 (10.1–10.9), FeO t (0.3–1.4), ZnO (21.5–25.8), MgO (6.9–9.7), MnO (6.4–7.7), K 2 O (8.4–9.1), Rb 2 O (0.5–0.8), Li 2 O (up to 0.3), F (1.5–2.3) and H 2 O (2.1–2.5 wt.%). The simplified average formula of this hendricksite can be expressed as K(Zn 1.5 Mg 0.9 Mn 0.5 Li 0.1 )(Al 0.9 Si 3.1 O 10 )(OH) 1.5 F 0.5 . Zn-Mn-bearing fluorophlogopite and fluorian phlogopite occur in porphyritic phonolite. These micas are richer in SiO 2 (41.5–46.9), MgO (13.2–18.5), Li 2 O (0.3–1.3) and F (3.1–5.9), but poorer in Al 2 O 3 (7.5–10.0) and ZnO (5.3–15.4 wt%) than hendricksite. Their formulae can be expressed as K(Mg 2 Li 0.4 Zn 0.3 Mn 0.3 )(Al 0.6 Si 3.4 O 10 )F 1.3 (OH) 0.7 and K(Mg 1.6 Zn 0.8 Mn 0.4 Li 0.2 )(Al 0.8 Si 3.2 O 10 )(OH) 1.1 F 0.9 , respectively, indicating that these minerals are compositionally intermediate with respect to fluorophlogopite KMg 3 (AlSi 3 O 10 )F 2 , phlogopite KMg 3 (AlSi 3 O 10 )(OH) 2 , hendricksite KZn 3 (AlSi 3 O 10 )(OH,F) 2 and tainiolite KLiMg 2 (Si 4 O 10 )F 2 . The appearance of [6] Zn-containing minerals (kupletskite, Zn-rich micas, perraultite) in the Oktyabrsky phonolites indicates low f S 2 , high f O 2 , high alkalinity and high volatiles content of their parental magma. These rocks represent the latest derivatives of magma evolution for the Oktyabrsky massif. They lack sulphide mineralization and contain abundant H 2 O- or F-bearing minerals; their Fe content is mainly concentrated as Fe 3+ in aegirine.

FORAMINIFERAL BIOSTRATIGRAFY OF PALEOGENE DEPOSITES OF THE EASTERN AZOV REGION

Paleogene sea deposits biostratigraphic chart of the Eastern Azov region based on foraminifera is proposed. Foraminiferal associations of the Upper Belokamian (complex with Anomalina danica, Cibicidoides ex gr. lectus), Kachian (Acarinina subsphaerica), Simpheropolian (Acarinina bullbrooki), Novopavlovkian (Acarinina rotundimarginata, Hantkenina alabamensis), Kumian (Subbotina turkmenica), Almian (beds with Globigerapsis tropicalis, beds with Bolivina antegressa) and Planorbellian (beds with Trifarina transcaspiensis, beds with Lenticulina herrmanni, beds with Spiroplectammina carinata oligocenica) regional stages are described. Correlation of the Novoazov, the Scherbak and the Sachan bodies, the Jelanchik and the Borisphen suites of the Eastern Azov region with units of the Western Azov region and the Azov-Kuban depression are carried out.

New Records of Reptiles (Reptilia, Squamata) at Azov Seashore of Taman’ Peninsula (Krasnodar Kray, Russia)

For the first time at Azov seashore of Taman’ peninsula (settlement Golubitskaya and west of Peresyp’ village) there were found populations of meadow lizard Darevskia praticola pontica (Lantz et Cyren, 1919). The lizards live in the lower parts of a high shore slope with a phryganoid vegetation. The density of their population can reach 1 individual per square meter (1 individual per 1 m 2 ), and in the places of their concentration — 5 and more individuals per 1 m 2 . In second place, in the upper parts of the shore slope near village Peresyp’ the glass lizard, Pseudopus apodus (Pallas, 1775) was also found. New records of these species are separated for 30 km to the east and 70 km to the south correspondingly from previously known localities. The runner, Elaphe sauromates Pallas, 1814, which has not been found earlier in the Eastern Azov area, is not rare in the Akhtanizov estuary region.

Zone of Catagenetic Hydromicatization of Clays—An Area of Intense Redistribution of Chemical Elements: Communication 1. Geological–Lithological Features and Formation Mechanism of Elision Systems in the Ciscaucasian Region

This work discusses lithological–stratigraphic peculiarities of Mesozoic–Cenozoic rocks exposed in the Sulak River basin and drilled by the Kuban superdeep borehole with description of the geotectonic features of the eastern Ciscaucasian and Azov–Kuban elision basins. Catagenetic alterations of sedimentary sequences from these regions are analyzed and the general scheme of catagenetic zoning in elision basins is proposed.