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• W2997384064 abstract "Problem Statement and Purpose. The transformation of the Neoeuxinian Lake into the Black Sea at the Neopleistocene-Holocene boundary represents a considerable interest for Quaternary geology. The age of the boundary, the character of the transformation (gradual, gradual but with oscillations, prominent, or catastrophic), and changes in salinity are highly controversial. The main goal of the paper is to contribute to the controversial subjects using the high-resolution paleontological (foraminifera. ostracoda. and mollusks) data supplemented by palynological data and radiocarbon datings.Data & Methods. The study area is located within the northwestern (Ukrainian) and western (Bulgarian) shelf of the Black Sea. The material for micropaleontological study was obtained by the coring using the Ukrainian research vessel “Vladimir Parshin” and the Bulgarian research vessel “Academician L. Orbeli in 2008 and 1976. respectively. All cores are located outside the isobath 100 m. The results of previous micropaleontological investigations are used for comparison. Microfauna was investigated according to the method of V. V. Yanko. Radiocarbon dating was performed by AMS (Core 38) or conventional - P-counting (Core 2345) methods on Mytilus and Dreissena shells.Results. Foraminifera are not adapted to freshwater environment. As a rule, the border between brackish and freshwater environment can be traced by their disappearance, with the exception of Allogromiida species with organic tests, which were not found in the studied material. For this reason, the presence of relatively diverse calcareous foraminifera suggests that the Neoeuxinan lake was brackish. Geochemical (salinity of pore water) and micropaleontological data are in full agreement.If there would not be inflow from the Mediterranean Sea until 7.2 ka BP or 8.4 ka BP according to the first and second catastrophic flooding scenarios of Ryan et al., no Mediterranean immigrants would be present in sediments older than 8.4 ka BP.However, they are present in sediment columns as can be seen from our and other researchers investigations. If the colonization of the Neoeuxinan lake by Mediterranean immigrants would be prominent or catastrophic, there would be a sharp increase in the species diversity and quantity of forammifera. ostracods and mollusks. However, these parameters increase gradually. The boundary between the Upper Neopleistocene and Holocene lies within 9 and 10 thousand years ago. The transformation of Neoeuxinan lake into the Black Sea was gradual: from brackish to a semi-marine, and then to a marine water body in course of the Mediterranean transgression during Holocene. The increase in salinity- occurred gradually over 3600 years, while the rate of penetration of sea water was about 0.05-1.7 cm a-1. The Holocene marine transgression was progressive in nature, intensifying with the transition from the early to late Holocene. The high-resolution micropaleontological study of Core 38 provides new data on the last pages of the development of the brackish Neoeuxinan lake that are mostly absent in other cores. Changes in the foraminiferal assemblages on the Pleistocene - Holocene boundary depend on the facies. They are more pronounced in marine facies compared to shallow ones, especially in areas affected by paleorivers. Palynological data provide evidence for cold climate at the end of the Neoeuxinian time." @default.
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• W2997384064 date "2019-12-26" @default.
• W2997384064 modified "2023-09-26" @default.
• W2997384064 title "TRANSFORMATION OF THE NEOEUXINIAN LAKE INTO THE BLACK SEA AT THE NEOPLEISTOCENE - HOLOCENE BOUNDARY ON PALEONTOLOGICAL DATA" @default.
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• W2997384064 doi "https://doi.org/10.18524/2303-9914.2019.2(35).183737" @default.
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