Biomarkers reveal two paramount Pliocene-Pleistocene connectivity events in the Caspian Sea Basin
Landlocked basins like the Caspian Sea are highly sensitive to changes in their hydrological budget, especially at times of disconnection from the global ocean. Here, we reconstruct the Pliocene to Pleistocene palaeohydrological and palaeoenvironmental changes occurring in the South Caspian Basin be...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/417983 2023-07-23T04:18:00+02:00 Biomarkers reveal two paramount Pliocene-Pleistocene connectivity events in the Caspian Sea Basin Vasiliev, Iuliana van der Meer, Marcel T.J. Stoica, Marius Krijgsman, Wout Reichart, Gert Jan Lazarev, Sergei Butiseacă, Geanina A. Niedermeyer, Eva M. Aliyeva, Elmira van Baak, Christian G.C. Mulch, Andreas Paleomagnetism Stratigraphy and paleontology 2022-02-01 application/pdf https://dspace.library.uu.nl/handle/1874/417983 en eng 0031-0182 https://dspace.library.uu.nl/handle/1874/417983 info:eu-repo/semantics/ClosedAccess Akchagylian marine incursion Black Sea influx Hydrogen isotopes N-alkanes Palaeohydrology Pleistocene South Caspian Basin Oceanography Ecology Evolution Behavior and Systematics Earth-Surface Processes Palaeontology Article 2022 ftunivutrecht 2023-07-02T03:35:44Z Landlocked basins like the Caspian Sea are highly sensitive to changes in their hydrological budget, especially at times of disconnection from the global ocean. Here, we reconstruct the Pliocene to Pleistocene palaeohydrological and palaeoenvironmental changes occurring in the South Caspian Basin between ~3.6 and ~ 1.9 Ma, using compound-specific hydrogen isotope (δ2H) data on long chain n-alkanes and alkenones. Additionally, we established a record of mean annual air temperature (MAT) and the source of organic matter, based on the relative distribution of branched and isoprenoid glycerol dialkyl glycerol tetraethers (BIT). The ~55‰ variation in the δ2H measured on the terrestrial plant long chain n-alkanes indicates significant continental hydrological changes in the region surrounding the Caspian Sea over the investigated 1.7 Myr interval. The MAT and BIT data show that the so-called Akchagylian marine incursion at around 2.75 Ma, marked by influx of marine biota into the Caspian Basin, originated from a cold region of the open ocean, endorsing a hydrological connection with the Arctic domain. The onset of the regional Apsheronian stage at ~2.13 Ma, identified by the invasion of Tyrrhenocythere sp. ostracods, coincided with a change towards constant δ2Hn-alkane and is shortly followed by the occurrence of alkenones in the Caspian Basin. The relative distributions of alkenones and their δ2H values indicate that a connection with a saline basin, most likely the Black Sea, was established at the Akchagylian–Apsheronian transition. Article in Journal/Newspaper Arctic Utrecht University Repository Arctic |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Akchagylian marine incursion Black Sea influx Hydrogen isotopes N-alkanes Palaeohydrology Pleistocene South Caspian Basin Oceanography Ecology Evolution Behavior and Systematics Earth-Surface Processes Palaeontology |
spellingShingle |
Akchagylian marine incursion Black Sea influx Hydrogen isotopes N-alkanes Palaeohydrology Pleistocene South Caspian Basin Oceanography Ecology Evolution Behavior and Systematics Earth-Surface Processes Palaeontology Vasiliev, Iuliana van der Meer, Marcel T.J. Stoica, Marius Krijgsman, Wout Reichart, Gert Jan Lazarev, Sergei Butiseacă, Geanina A. Niedermeyer, Eva M. Aliyeva, Elmira van Baak, Christian G.C. Mulch, Andreas Biomarkers reveal two paramount Pliocene-Pleistocene connectivity events in the Caspian Sea Basin |
topic_facet |
Akchagylian marine incursion Black Sea influx Hydrogen isotopes N-alkanes Palaeohydrology Pleistocene South Caspian Basin Oceanography Ecology Evolution Behavior and Systematics Earth-Surface Processes Palaeontology |
description |
Landlocked basins like the Caspian Sea are highly sensitive to changes in their hydrological budget, especially at times of disconnection from the global ocean. Here, we reconstruct the Pliocene to Pleistocene palaeohydrological and palaeoenvironmental changes occurring in the South Caspian Basin between ~3.6 and ~ 1.9 Ma, using compound-specific hydrogen isotope (δ2H) data on long chain n-alkanes and alkenones. Additionally, we established a record of mean annual air temperature (MAT) and the source of organic matter, based on the relative distribution of branched and isoprenoid glycerol dialkyl glycerol tetraethers (BIT). The ~55‰ variation in the δ2H measured on the terrestrial plant long chain n-alkanes indicates significant continental hydrological changes in the region surrounding the Caspian Sea over the investigated 1.7 Myr interval. The MAT and BIT data show that the so-called Akchagylian marine incursion at around 2.75 Ma, marked by influx of marine biota into the Caspian Basin, originated from a cold region of the open ocean, endorsing a hydrological connection with the Arctic domain. The onset of the regional Apsheronian stage at ~2.13 Ma, identified by the invasion of Tyrrhenocythere sp. ostracods, coincided with a change towards constant δ2Hn-alkane and is shortly followed by the occurrence of alkenones in the Caspian Basin. The relative distributions of alkenones and their δ2H values indicate that a connection with a saline basin, most likely the Black Sea, was established at the Akchagylian–Apsheronian transition. |
author2 |
Paleomagnetism Stratigraphy and paleontology |
format |
Article in Journal/Newspaper |
author |
Vasiliev, Iuliana van der Meer, Marcel T.J. Stoica, Marius Krijgsman, Wout Reichart, Gert Jan Lazarev, Sergei Butiseacă, Geanina A. Niedermeyer, Eva M. Aliyeva, Elmira van Baak, Christian G.C. Mulch, Andreas |
author_facet |
Vasiliev, Iuliana van der Meer, Marcel T.J. Stoica, Marius Krijgsman, Wout Reichart, Gert Jan Lazarev, Sergei Butiseacă, Geanina A. Niedermeyer, Eva M. Aliyeva, Elmira van Baak, Christian G.C. Mulch, Andreas |
author_sort |
Vasiliev, Iuliana |
title |
Biomarkers reveal two paramount Pliocene-Pleistocene connectivity events in the Caspian Sea Basin |
title_short |
Biomarkers reveal two paramount Pliocene-Pleistocene connectivity events in the Caspian Sea Basin |
title_full |
Biomarkers reveal two paramount Pliocene-Pleistocene connectivity events in the Caspian Sea Basin |
title_fullStr |
Biomarkers reveal two paramount Pliocene-Pleistocene connectivity events in the Caspian Sea Basin |
title_full_unstemmed |
Biomarkers reveal two paramount Pliocene-Pleistocene connectivity events in the Caspian Sea Basin |
title_sort |
biomarkers reveal two paramount pliocene-pleistocene connectivity events in the caspian sea basin |
publishDate |
2022 |
url |
https://dspace.library.uu.nl/handle/1874/417983 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
0031-0182 https://dspace.library.uu.nl/handle/1874/417983 |
op_rights |
info:eu-repo/semantics/ClosedAccess |
_version_ |
1772180116809449472 |