Redox evolution during Eemian and Holocene sapropel formation in the Black Sea.

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dc.contributor.author Wegwerth, Antje
dc.coverage.spatial MEDIAN LATITUDE: 42.225626 * MEDIAN LONGITUDE: 36.492705 * SOUTH-BOUND LATITUDE: 42.225170 * WEST-BOUND LONGITUDE: 36.491500 * NORTH-BOUND LATITUDE: 42.226000 * EAST-BOUND LONGITUDE: 36.493330 * DATE/TIME START: 2007-05-28T01:56:00 * DATE/TIME END: 2007-05-31T11:27:00
dc.date.accessioned 2019-11-26T02:40:25Z
dc.date.available 2019-11-26T02:40:25Z
dc.date.issued 2019-08-16
dc.identifier https://doi.pangaea.de/10.1594/PANGAEA.905045
dc.identifier https://doi.org/10.1594/PANGAEA.905045
dc.identifier.citation Wegwerth, Antje; Eckert, Sebastian; Dellwig, Olaf; Schnetger, Bernhard; Severmann, Silke; Weyer, Stefan; Brüske, Annika; Kaiser, Jérôme; Köster, Jürgen; Arz, Helge W; Brumsack, Hans-Jürgen (2018): Redox evolution during Eemian and Holocene sapropel formation in the Black Sea. Palaeogeography, Palaeoclimatology, Palaeoecology, 489, 249-260, https://doi.org/10.1016/j.palaeo.2017.10.014
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/7934
dc.description.abstract The Black Sea repeatedly experienced major hydrographic changes during glacial-interglacial transitions, with alternating limnic and brackish stages. While the redox conditions during the present Holocene brackish period (since ~ 9,000 yr BP) have been intensively studied, the redox evolution during the last interglacial, the Eemian (~ 128,000-120,000 yr BP), remains largely unexplored. With its at least 3 °C warmer climate and an up to 10 m higher global sea level, the Eemian could open a window into the future development of the Black Sea. This study provides a detailed comparison of the Black Sea redox evolution during Eemian and Holocene sapropel formation. We show that the redox conditions and associated geochemical processes in the Black Sea water column can strongly deviate from the Holocene when sea level and climate conditions are different. Mo/Al and Re/Mo as well as Mo and Fe isotope proxies record a comparatively uniform rise of the Eemian redoxcline culminating in pronounced euxinia. This scenario strongly contrasts with weaker euxinic conditions during the Holocene Unit II sapropel (~ 8,000-2,500 yr BP). Higher Mo/TOC ratios during the Eemian and Mo inventory considerations suggest a higher Eemian Mo availability, possibly due to an improved connection to the Mediterranean Sea. We conclude that higher temperatures, productivity, sea level-associated salinity changes, and corresponding higher sulphide levels were ultimately responsible for enhanced trace metal enrichment during the Eemian Black Sea sapropel stage.
dc.format application/zip, 8 datasets
dc.language.iso en
dc.publisher PANGAEA
dc.rights CC-BY-4.0: Creative Commons Attribution 4.0 International
dc.rights Access constraints: unrestricted
dc.source Supplement to: Wegwerth, Antje; Eckert, Sebastian; Dellwig, Olaf; Schnetger, Bernhard; Severmann, Silke; Weyer, Stefan; Brüske, Annika; Kaiser, Jérôme; Köster, Jürgen; Arz, Helge W; Brumsack, Hans-Jürgen (2018): Redox evolution during Eemian and Holocene sapropel formation in the Black Sea. Palaeogeography, Palaeoclimatology, Palaeoecology, 489, 249-260, https://doi.org/10.1016/j.palaeo.2017.10.014
dc.subject Euxinia
dc.subject Interglacials
dc.subject Restricted basin
dc.subject trace metals
dc.subject δ56Fe
dc.subject δ98Mo
dc.title Redox evolution during Eemian and Holocene sapropel formation in the Black Sea.
dc.title.alternative Proxy data of Holocene and Eemian sapropels in the Black Sea
dc.type Dataset


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