Author, as appears in the article.: Lazarev, S; Kuiper, KF; Oms, O; Bukhsianidze, M; Vasilyan, D; Jorissen, EL; Bouwmeester, MJ; Aghayeva, V; van Amerongen, AJ; Agusti, J; Lordkipanidze, D; Krijgsman, W
Department: Història i Història de l'Art
URV's Author/s: Agusti Ballester, Jorge
Keywords: United states Turkmenistan Transgression Thermohaline circulation Surface waters Surface area Sudden expansion Russian plain Reservoirs Productive series Precipitation (meteorology) Precipitation (climatology) Plio–pleistocene Pliocene Plio-pleistocene Paratethys Panama Outcrop Onset Northern hemisphere glaciations Northern hemisphere Marine incursion Mammals Mammalia Magnetostratigraphy Kvabebi Kushkuna Kura basin Interglacial cyclicity Historical record Global climates Global climate Glacial-interglacial cycle Glacial geology Georgia Geomagnetic-field Geological time Geological record Expansion Caspian sea Caspian basin Black sea Basin Azerbaijan Atmospheric precipitation Atlantic ocean Argon-argon dating Archaeology Akchagylian Age determination 40ar/39ar chronology 40ar 39ar chronology
Abstract: The Global climate reorganisation in the late Pliocene linked to enhancement of the Atlantic Ocean Thermohaline Circulation (AOTC), instigated a transition to glacial-interglacial cyclicity in the Quaternary. Enhancement of the AOTC amplified atmospheric precipitation over the Eurasian interior strengthening Northern Hemisphere Glaciation. Increased rainfall on the vast Russian Plain drained into the endorheic Caspian Sea, which makes the Caspian geological record highly potential for tracing atmospheric precipitation changes. Two major palaeohydrological events in the Caspian Sea, the Akchagylian transgression and the Akchagylian marine incursion, led to a five-fold enlargement of the Caspian Sea surface area and transformed the basin palaeoecology, enabling active interregional faunal dispersals. The Akchagylian Stage still lacks an unequivocal age model with two age constraints - the "long Akchagylian" (3.6-1.8 Ma) and the "short Akchagylian" (2.7-2.1 Ma) standing on magnetostratigraphic studies of geological records in Turkmenistan and the Kura Basin, respectively. The age discrepancies also exist within the Kura Basin, where the fossil mammal-bearing Kvabebi locality with Akchagylian marine fauna was magnetostratigraphically dated at 3.2 Ma. In this paper, we try to resolve the age contradictions for the Akchagylian Stage. We revisit the Kvabebi (Georgia) and Kushkuna (Azerbaijan) sections of the western Kura Basin and provide new magnetostratigraphic and 40Ar/39Ar age constraints on these marginal Akchagylian deposits. Moreover, we revise the magnetostratigraphy of 25 geological records from Turkmenistan and the Kura Basin and propose a new unified age model for the Akchagylian Stage: 1. Intrabasinal Akchagylian freshwater-mesohaline transgression at 2.95 +/- 0.02 Ma; 2. Akchagylian marine incursion through establishment of a Caspian-Arctic connection (2.75-2.45 Ma); 3. Akchagylian-Apsheronian boundary highlighting a Caspian-Black Sea connection at 2.13 Ma. The sudden expansion of the Caspian Sea at 2.95 +/- 0.02 Ma potentially correlates to the interglacial intensification of the AOTC between 2.95 and 2.82 Ma. The new ages constrain a much shorter (2.95-2.1 Ma) Akchagylian than in previously mentioned regional geological time scales (3.6-1.8 Ma) and strongly appeal to reconsider the ages of numerous archaeological and mammalian sites in the Caspian region.
Thematic Areas: Planejamento urbano e regional / demografia Oceanography Interdisciplinar Global and planetary change Geosciences, multidisciplinary Geosciences, interdisciplinary Geography, physical Geografía Geociências Ciências agrárias i Biodiversidade
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: jorge.agusti@urv.cat
Author identifier: 0000-0002-7240-1992
Record's date: 2024-07-27
Papper version: info:eu-repo/semantics/publishedVersion
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Global And Planetary Change. 206
APA: Lazarev, S; Kuiper, KF; Oms, O; Bukhsianidze, M; Vasilyan, D; Jorissen, EL; Bouwmeester, MJ; Aghayeva, V; van Amerongen, AJ; Agusti, J; Lordkipanidze, (2021). Five-fold expansion of the Caspian Sea in the late Pliocene: New and revised magnetostratigraphic and Ar-40/Ar-39 age constraints on the Akchagylian Stage. Global And Planetary Change, 206(), -. DOI: 10.1016/j.gloplacha.2021.103624
Entity: Universitat Rovira i Virgili
Journal publication year: 2021
Publication Type: Journal Publications
Repositori URV