Widespread overspill from a saline density-current channel and its interaction with topography on the south-west Black Sea shelf

Sedimentology ◽  
2013 ◽  
Vol 60 (7) ◽  
pp. 1639-1667 ◽  
Author(s):  
Richard N. Hiscott ◽  
Ali E. Aksu ◽  
Roger D. Flood ◽  
Vladimir Kostylev ◽  
Doğan Yaşar
2020 ◽  
Vol 154 ◽  
pp. 136-150 ◽  
Author(s):  
Bilal Bingölbali ◽  
Halid Jafali ◽  
Adem Akpınar ◽  
Serkan Bekiroğlu

Author(s):  
Semerhei-Chumachenko A. B. ◽  
Agayar E. V. ◽  
Zhuk D. O.

Tornadoes and strong squalls are dangerous for almost all spheres of human life and the economy of the region. The degree of negative impact depends on their type, quantity, intensity, area of formation and geographical features of the territory. The article defines the dynamics of the number of tornadoes and strong squalls in the North-Western Black Sea region (Odessa, Nikolayev and Kherson regions of Ukraine) from 2006 to 2020.Geographical position of the south-west of Ukraine, synoptic processes and a variety of climatic conditions contribute to the frequent occurrence of severe convective phenomena and creating the extraordinary complexity of their space-time distribution. The study revealed current trends in the formation of dangerous convective phenomena in the south-west of Ukraine. One of the most squall-prone regions of Ukraine is the territory of the North-Western Black Sea region. During 2006-2020 there was an increase in the number of squalls and tornadoes in the North-Western Black Sea region in comparison with previous years.


1859 ◽  
Vol 9 ◽  
pp. 585-585

"I am returned after an absence of nearly six months, during which I have been travelling in the Danubian Principalities, in Turkey in Europe, and along the south-west and north coasts of the Black Sea, in order to make magnetic observations, and to determine more accurately the geographical position, as well as the magnetic declination, of many points of the coast.”


2019 ◽  
Vol 8 (3) ◽  
pp. 173-178
Author(s):  
Sergey Olegovich Simonenko

In 2018, a secondary Sarmatian burial with an impressive inventory (molded pot, pottery jug, silver earring, necklace of beads) was discovered in the Scythian mound in the course of the study of the barrow group Garden near the Glinoe village, Slobodzeya region, on the left bank of the Lower Dniester. Orientation of the buried head to the south-southeast is quite rare in the North-West Black Sea region. The cult of fire is fixed by the finds of three burned pebbles from the left to the head. A handmade pot combines features known for the dishes of a given cultural and chronological period. At the same time, the wave-like ornament in the upper part of the body was fixed only once on a similar vessel in the Danube-Dniester interfluve. Of particular interest is a pottery jug from the complex. Such forms were not previously known in the North-West Black Sea region. The closest analogies to the vessel come from the sites of the Volga-Don interfluve. Earrings identical to those found in the published grave are widely represented in the materials of the Prut-Dniester interfluve, the Middle and Lower Dniester. Necklaces of various shapes and beads belong to the most mass material received by the Sarmatians from ancient centers. The burial dates back to the 2nd century based on the analysis of the grave goods.


Author(s):  
Т.В. Гиоргобиани

В статье рассмотрены условия формирования складчатой системы Большого Кавказа в альпийскую эпоху. Показано, что главная зональная линейная складчатая структура региона была сформирована на ранне- и среднеальпийской стадиях развития в результате проявления батской и пиренейской фаз складчатости. Установлено, что причиной складкообразования было активное столкновение Черноморско-Закавказского микроконтинента на юго-западе с пассивной окраиной Большого Кавказа. Определено, что позднеальпийская стадия в регионе проходила в условиях субмеридионального тангенциального давления, во время проявления плиоцен-четвертичных фаз складчатости. В это время на Большой Кавказ воздействовал не целостный Черноморско-Закавказский микроконтинент, а слагающие его мелкие плиты и блоки-шоли. Выяснено, что они в процессе тектогенеза перемещались и косо вдвигались в складчатую систему Большого Кавказа, вызывая преобразование первичной структуры и возникновение интерференционной складчатости. В результате повторного деформирования отдельных участков региона в его пределах образовалась неоднородная складчатая структура. Изучена основная особенность складчатой системы Большого Кавказа, выраженная структурной неоднородностью складчатости в поперечном и продольном направлениях. Установлено, что она отражает поэтапную и разноплановую деформацию отдельных участков, возникающую в результате последовательного проявления в регионе локальной и региональной геодинамики микроконтинента, а также связанных с ними общих и частных механизмов его формирования. Структурный анализ морфологии складчатости БК действительно показал неравномерную дислоцированность его – С-З и Ю-В сегментов, сложенных в основном ранне- и среднеальпийскими структурами, выраженную в разной степени осложненности коллизионными деформациями. Так, в пределах мальм-эоценового структурного этажа С-З Кавказа, раннеальпийская структура которого меньше всех остальных сегментов усложнена коллизионными деформациями, четко проявлена латеральная асимметричная зональность его складчатой структуры.  Она выражена в последовательной смене с юго-запада на северо-восток интенсивной линейной сильно сжатой складчатости линейными гребневидными, а затем слабо вытянутыми типичными брахиморфными складками, переходящими, в свою очередь, в полого наклонную на северо-восток моноклиналь The article considers the conditions of formation of folded system of the Greater Caucasus in the Alpine Epoch. It is shown that main zonal linear folded structure of the region was formed at the early and middle Alpine stages of the evolution in the result of manifestation of Bathonian and Pyrenean stages of folding. It was established that the cause of the folding was an active collision of the Black Sea-Transcaucasian microcontinent in the south-west with the passive margin of the Greater Caucasus. It was also determined that the Late Alpine stage in the region took place under the conditions ofsubmeridional tangential stress, during the Pliocene-Quarternary folding phases. During this period the Greater Caucasus was affected not by the whole Black Sea-Transcaucasian microcontinent, but by its smaller plates and blocks. It was found out that during the process of tectogenesis they drifted and obliquely moved into the folded system of the Greater Caucasus, causing the transformation of the initial structure and the occurrence of interferential folding. In the result of repeated deformation of separate areas of the region the heterogeneous folded structure was formed. The main feature of the folded structures of the Greater Caucasus (expressed by a structural heterogeny in transversal and longitudinal directions) was studied. It was determined that it reflects the gradual and diverse deformation of individual sections, resulting from the consistent manifestation of the local and regional geodynamics of the microcontinent, as well as the common and specific mechanisms of its formation associated with them. The structural analysis of the morphology of folding of the Great Caucasus really showed its uneven dislocation, i.e. the N-W and S-E of the segments, composed mainly of early and middle Alpine structures, expressed in varying degrees of complication by collisional deformations. So, within the Malm-Eocene structural floor of the northwestern Caucasus, the Early Alpine structure of which is less than all the other segments, is complicated by collimated deformations, the lateral asymmetric zonality of its folded structure is clearly manifested. It is expressed in a successive change from the south-west to the north-east of intensive linear highly compressed folding with linear ridge-like, and then slightly elongated typical brachymorphic folds, which turn into a hollow sloping to the north-east monocline


2020 ◽  
Vol 16 (3) ◽  
pp. 13-29
Author(s):  
M. KOZLENKO ◽  
Yu. KOZLENKO

A density model was built along the Bs05-22 profile, which made it possible to identify individual blocks with different crustal parameters. The consolidated crust of the East European Platform (EEP) has a “key” structure. The southern boundary of the EEP is clearly fractured and falls to the south at an angle of about 83° The South Ukrainian monocline (SUM) covers not only the basement of the EEP but also the northern part of the Scythian Plate (SP). The central part of SP block overlapped by the SUM is characterized by the maximum capacity of the folded-metamorphic base. The axial part of the Karkinit Trough (KT) has a structure typical for riftogens. The rift is practically one-sided with a width of 6.5 km. The southern slope of the KT developed as a result of the falling of the surface by the mechanism of the planj-principle. The border between the Karkinit Trough and the Kalamitsky rise (KR) is clearly defined by the Sulinsko-Tarkhankutsk fault. The core of the KR is a sufficiently massive body of lenticular shape with a density corresponding to the Taurian series of the Mountainous Crimea. There is a narrow transition zone between KT and Edge step (ES). The southern edge of the Scythian plate is a 25,0 km wide transition zone to West-Black Sea depression (WBSD). Modeling established the extension of the “granodiorite” layer into the WBSD for 100 km. The crust thickness within the EEP is 44,0 km, on the Scythian plate under SUM is average 43.5 km, 37,0 km within KT and 33,0 km under ES, in the West Black Sea basin 28,7 km under the foot of the Upper Cretaceous continental slope and 21,5 km at the southern edge of the profile. In the model chosen, the density of tectonic faults in the EEP is 0,06 and in the SP — 0,14 per 1,0 km. Vertical shifts of crystalline crust blocks at SP reach 5,5 km, which is almost three times higher than at the southern flank of the EEP. The most of disjunctions are vertical and have transcrust stretch. The structure of the Earth’s crust obtained as a result of modeling allowed us to draw some conclusions about the Meso-Cenozoic evolution of the studied region in the profile section. At the southern edge of the EEP in the Late Cimmerian tectogenesis epoch there has been a revitalization, in the Alpine phase this structure was generally passive. Activity of the Cimmerian epoch was observed throughout the Scythian plate: within the Kalmitsky rise from the early phase, and in the Karkinit Trough and on the Edge step from the late Cimmerian phase. The periods of activation on the KT and KR are traced up to the Sawa phase, and on the ES — to the Walach phase of the Alpine tectogenesis inclusive.


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