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Wegwerth, Antje (2019): Proxy data of Holocene and Eemian sapropels in the Black Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.905045, Supplement to: Wegwerth, Antje; Eckert, Sebastian; Dellwig, Olaf; Schnetger, Bernhard; Severmann, Silke; Weyer, Stefan; Brüske, Annika; Kaiser, Jérôme; Köster, Jürgen; Arz, Helge Wolfgang; 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

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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.
Keyword(s):
Euxinia; Interglacials; Restricted basin; trace metals; δ56Fe; δ98Mo
Coverage:
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
Size:
8 datasets

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Datasets listed in this publication series

  1. Wegwerth, A (2019): Overview of parameters measured on the sediment cores of this study recovered during Meteor cruise M72/5. https://doi.org/10.1594/PANGAEA.905000
  2. Wegwerth, A (2019): Holocene strontium/calcium ratio in Ostracods from Black Sea sediment core M72/5_619-1 (22-GC3) taken at station 22 during Meteor cruise M72/5. https://doi.org/10.1594/PANGAEA.905026
  3. Wegwerth, A (2019): Eemian iron isotopes from Black Sea sediment cores taken at station 22 during Meteor cruise M72/5. https://doi.org/10.1594/PANGAEA.905044
  4. Wegwerth, A (2019): Holocene and Eemian isorenieratene derivatives from Black Sea sediment cores taken at station 22 during Meteor cruise M72/5. https://doi.org/10.1594/PANGAEA.905040
  5. Wegwerth, A (2019): Holocene and Eemian molybdenum isotopes from Black Sea sediment cores taken at station 22 during Meteor cruise M72/5. https://doi.org/10.1594/PANGAEA.905043
  6. Wegwerth, A (2019): Holocene rhenium and molybdenum contents from Black Sea sediment cores taken at station 22 during Meteor cruise M72/5. https://doi.org/10.1594/PANGAEA.905035
  7. Wegwerth, A (2019): Eemian total organic carbon, aluminium, iron, molybdenum, rhenium, calcium and zirconium from Black Sea sediment cores taken at station 22 during Meteor cruise M72/5. https://doi.org/10.1594/PANGAEA.905039
  8. Wegwerth, A (2019): Holocene total organic carbon, molybdenum and iron from Black Sea sediment cores taken at station 22 during Meteor cruise M72/5. https://doi.org/10.1594/PANGAEA.905024