New data on the upper quaternary stratigraphy of the North Caspian Sea

Bezrodnykh, Yu. P.; Deliya, S. V.; Romanyuk, B. F.; Сорокин, В.М.; Yanina, Т.А.

doi:10.1134/s1028334x15050025

Cited by 20 publications

(8 citation statements)

References 3 publications

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“…(Bezrodnykh et al . 2015). Even at the lower end of this range, a significant and sustained input of water would be required to drive this transgression.…”

Section: Discussionmentioning

confidence: 99%

First reliable chronology for the Early Khvalynian Caspian Sea transgression in the Lower Volga River valley

Kurbanov

Murray

Thompson

et al. 2020

Boreas

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During the late Quaternary, dramatic changes in relative sea level (~170 m) are known to have occurred in the Caspian Sea. However, all previous attempts at resolving the uncertainty associated with the timing of these transgressive/regressive events, primarily using radiocarbon, have produced inconclusive or controversial results. Here we present the first reliable chronology for the largest known transgression (Early Khvalynian). This was derived using optically stimulated luminescence (OSL) analysis of sand‐sized quartz, with support from infrared stimulated luminescence (IRSL) from K‐rich feldspar grains, all extracted from 16 sediment samples collected along the Lower Volga River. These samples were taken from loessic sediments, marine clays (known as Chocolate Clays) and the overlying modern soils exposed at three sections (Srednyaya Akhtuba, Raygorod, Leninsk) ~200 km upstream of the present‐day estuary. The differential bleaching rates of the quartz OSL and feldspar IRSL signals were used to evaluate the degree of resetting of quartz (and feldspar) signals; it was possible to conclude that all signals, and particularly quartz OSL, were sufficiently reset at deposition to allow accurate age estimation. Our results show unambiguously that the Early Khvalynian marine Chocolate Clays present at all three sections were deposited post‐LGM, between ~17 and ~13.1 ka ago. These age estimates are further constrained by those from the overlying Kastanozem soils (9.6–0.7 ka) and underlying loess‐soil series (32–19 ka), confirming a young (17–13 ka) age of the transgressive stage of the Early Khvalynian. Relative sea level during this period must have been well above the sampling altitudes of 11.7 m a.s.l. (Srednyaya Akhtuba), 11.3 m a.s.l. (Raygorod) and 4.7 m a.s.l. (Leninsk) to explain the absence of significant alluvial sand and to allow the deposition of the fine Chocolate Clays marker horizon.

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“…(Bezrodnykh et al . 2015). Even at the lower end of this range, a significant and sustained input of water would be required to drive this transgression.…”

Section: Discussionmentioning

confidence: 99%

First reliable chronology for the Early Khvalynian Caspian Sea transgression in the Lower Volga River valley

Kurbanov

Murray

Thompson

et al. 2020

Boreas

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“…The water was rather warm, as suggested by the composition of the mollusk assemblage dominated by crassoid Didacna (typically D. nalivkini and D. surachanica), which is characterized by large size and thick valves. The assumption is corroborated by the abundance of Corbicula fluminalis in the freshened water of the Northern Caspian at that time; currently, that species is encountered only in the south of the Caspian region (Yanina 2005;Bezrodnykh et al 2015). The salinity was higher than at present -from 10-12‰ in the Northern Caspian to 14-15‰ in the Southern basin Svitoch 2014).…”

Section: Late Khazarian Transgressive Epochmentioning

confidence: 87%

“…The late Khazarian transgression was followed by sea level lowering. This is suggested by the gaps in marine sedimentation processes, that are distinguished in the sequences exposed in the coastal scarps (Fedorov 1957;Popov 1983;Rychagov 1997;Svitoch and Yanina 1997;Yanina 2005 and in the sedimentary series found in the Northern Caspian (Yanina et al 2014;Bezrodnykh et al 2015). At present, there is no data indicative of the scale of the sea level lowering.…”

Section: Late Khazarian Transgressive Epochmentioning

confidence: 95%

“…Another transgressive basin has been recently uncovered by drilling in the Northern Caspian, which is the earliest Khvalynian basin (Bezrodnykh et al 2014(Bezrodnykh et al , 2015Sorokin et al 2018), with mollusk fauna including Didacna subcatillus, D. zhukovi, D. parallella. Judging from the mollusk habitus, the sea was moderately warm.…”

Section: Khvalynian Transgressive Epochmentioning

confidence: 99%

“…Judging from the mollusk habitus, the sea was moderately warm. From numerous radiocarbon dates the period of its existence is estimated to span from 37 ka BP (the 2 nd half of the MIS 3 interstadial) to LGM (MIS 2) (Bezrodnykh et al 2014(Bezrodnykh et al , 2015. That transgressive series is covered by a regressive layer dated by radiocarbon to 22-20 ka BP and corresponding to LGM.…”

Section: Khvalynian Transgressive Epochmentioning

confidence: 99%

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Environmental Variability Of The Ponto-Caspian And Mediterranean Basins During The Last Climatic Macrocycle

Yanina

2020

GES

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This paper reviews reconstructions of the the evolution of the Ponto-Caspian basin system to certain parts of the Pontian-Mediterranean system in order to analyze their correlation and response of the systems to the global climate change. The Ponto–Caspian and Mediterranean basins belong to different types of water basins and evolved differently in the Late Pleistocene responding in different ways to the global climate change. The paleogeographic reconstructions and correlation analysis of the Late Pleistocene events (within the last climatic macrocycle) made it possible to view the evolution of the basins as parts of a single system allowing to identify certain specific features and patterns in their functioning. The study is based on the analysis and integration of the data published by numerous researchers including the author of the paper and numerous colleagues from many countries who have been studying the paleogeography of the Ponto-Caspian and Mediterranean regions in the Late Pleistocene.

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Quaternary time scales for the Pontocaspian domain: Interbasinal connectivity and faunal evolution

Krijgsman

Tesakov

Yanina

et al. 2019

Earth-Science Reviews

166

126

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New data on the upper quaternary stratigraphy of the North Caspian Sea

Cited by 20 publications

References 3 publications

First reliable chronology for the Early Khvalynian Caspian Sea transgression in the Lower Volga River valley

First reliable chronology for the Early Khvalynian Caspian Sea transgression in the Lower Volga River valley

Environmental Variability Of The Ponto-Caspian And Mediterranean Basins During The Last Climatic Macrocycle

Quaternary time scales for the Pontocaspian domain: Interbasinal connectivity and faunal evolution

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