共查询到20条相似文献，搜索用时 15 毫秒
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G. G. Matishov K. V. Dyuzhova G. V. Kovaleva V. V. Pol’shin 《Doklady Earth Sciences》2016,467(2):371-375
Applying the methods of absolute geochronology and lithology, it has been established that the average sedimentation rate in the Sea of Azov over the last 6000 years (Ancient and New Azov times) varied from 0.2 to 2.0 mm/year. Its minimum values are confined to transit and sediment-starved zones coinciding with the directions of the main marine currents. It has been indicated that changes in the water level of the Sea of Azov occur with lag relative to landscape–climate phases. The obtained data confirm the relation between marine and terrestrial processes occurring in the Sea of Azov region: transgressive phases are preceded by general humidification in adjacent regions, while regressive phases correlate with climate aridization. The biostratigraphic analysis of the Holocene sections examined reveals the unstable behavior of the sea level during their formation. The results of diatom analysis confirm development of the Phanagoria and Korsun Regressions and Nymphea Transgression. Frequent fluctuations of the Sea of Azov the level determined the rhythmical structure of the sedimentary sequence saturated with autochthonous and allochthonous organic matter. 相似文献
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Doklady Earth Sciences - We studied the currents mode of the Azov Sea on the basis of instrumental measurements of R/V Deneb in 2018 and 2019. Using ADCP current meters, water exchange... 相似文献
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V. I. Popkov 《Geotectonics》2009,43(4):324-332
As follows from geological and geophysical data, tectonic deformations formed under lateral compression are widespread in the sedimentary cover at the bottom of the Sea of Azov. Fold-thrust dislocations are established in the North Azov Trough on the southern slope of the Ukrainian Shield, in the Azov Swell of the young Scythian Plate, and in the Indol-Kuban Foredeep. The transregional Main Azov Thrust Fault and smaller thrust faults of listric morphology tens of kilometers in extent are known. Asymmetric anticlines are related to their fronts. In plan view, the crests of these anticlines are displaced down the dip of the controlling faults. Folds and thrusts developed in pulsatory manner in the regime of periodically acting tangential compression are recorded in the thickness of the plate complex and stratigraphic and angular unconformities. Some of these dislocations are active and accompanied by anomalously high formation pressure, temperature and hydrochemical anomalies, tectonic brecciation, and mud volcanoes. 相似文献
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The results of paleoclimatic reconstructions made with the help of the information-statistical method developed by V.A. Klimanov based on palynological data from the Sea of Azov bottom sediments. For the period of the last 3000 years, four phases of warm and dry climates and three phases of relatively cool and humid climates were identified. The latter phases were characterized by wider expansion of tree vegetation in the region around the Sea of Azov. The range of mean annual temperatures between warmer and cooler intervals was about 4°C. 相似文献
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Doklady Earth Sciences - The results of instrumental measurements of the thermohaline structure and currents in the areas where fresh river waters (Taganrog Bay and Temryuk Bay) and the Black Sea... 相似文献
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Doklady Earth Sciences - The results of comprehensive studies of bottom sediments and coastal transects in the Sea of Azov, obtained in recent years, have been analyzed. The changes in natural... 相似文献
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Doklady Earth Sciences - The level of the Sea of Azov changed repeatedly during the Holocene. In recent years, the staff of the Southern Science Center, Russian Academy of Sciences, have sampled... 相似文献
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G. G. Matishov G. V. Kovaleva Kh. A. Arslanov K. V. Dyuzhova V. V. Polshin A. E. Zolotareva 《Doklady Earth Sciences》2018,479(2):452-455
New data on the absolute age of Quaternary bottom deposits from the Sea of Azov based on the results of radiocarbon analysis (14C) are presented. Overall, 67 radiocarbon dating of bottom deposits of New and Ancient Azov Ages were obtained. The thickness of sediments of the New Azov Age and their distribution over different areas of the Sea of Azov was determined during the study; the results obtained were compared with the reference data available. An integrated approach to the study of deposits, based on the combination of the biostratigraphy methods and the results of absolute age dating, was applied. 相似文献
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《International Geology Review》2012,54(11):1430-1443
Mineralogical and chemical analyses, distribution-abundance of Li, Rb, Ta, Nb, Be, Sn, Zr and rare earths of granitoid massifs and migmatites, and other data show that the altered granitoids in the area are essentially transitions from lithionite-amazonite-biotite to biotite-albite apogranites representing early stages of the metasomatic process. --IGR Staff. 相似文献
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The impact of atmospheric circulation fluctuations (Vangengeim’s classification) on the zoobenthos dynamics in the Sea of
Azov was studied. The “western” circulation processes lead to zoobenthos biomass decrease, and the opposite pattern was observed
when “eastern” circulation processes prevail. A quasiperiodicity with 3–7 to 10–15 year cycles is revealed for the zoobenthos
biomass dynamics. These changes are closely connected with the climatically induced increase of the zoobenthos biomass in
the Sea of Azov. 相似文献
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Fauna in the Semibalki locality (Azov Region), its stratigraphic position, and its age were considered. The rocks composing
sediments with fossil theriofauna were subject to petrochemical analysis. Taking into account the lithological features of
the sediments containing this fauna, it is possible to make the conclusion that the fossil fauna remains are allochthons and
their age range is somewhat broader than was considered before. 相似文献
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The sedimentation rates in the Sea of Azov for the period of the last 2000 years (Late Azov stage) were studied by methods
of absolute geochronology, lithology, and biostratigraphy. The average sedimentation rate of the Late Azov deposits varied
from 0.4–0.8 to 1.5–2.0 mm per year. It reached as much as 4.0–6.0 mm per year in the areas close to the sharp coasts and
was defined by the area geomorphology. The scheme of the lithological transects, sedimentation rates, and absolute age of
the sediments is presented. The palaeoecology peculiarities of deposit accumulation during the Late Azov stage are described
from the diatom and spore-pollen analyses. 相似文献
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Data on compositions of coexisting minerals in the graphite-bearing carbonatites of the Chernigovka massif are reported. Thermodynamic analysis of these results made it possible to establish that the temperature of equilibrium between graphite, dolomite, calcite, magnetite, and olivine for silica activity buffered by the (zircon + baddeleyite) assemblage is approximately 600°C. The minimal pressure of formation of these mineral assemblages is approximately 0.2 GPa, which is consistent with estimates of the erosion depth for the Chernigovka massif. The oxygen fugacity typical of the graphite-bearing carbonatite is 0.6–0.8 log units below the quartz-magnetite-fayalite buffer. Such values are typical of magmatic systems, e.g., basalts of the mid-ocean ridges (MORB). At 600°C, the gas phase in the C-H-O system equilibrated with the mineral assemblage of the carbonatite studied is dominated by CO2 and H2O, whereas methane-rich fluids appear at lower temperatures. 相似文献