Hypersalinity accompanies tectonic restriction in the eastern Mediterranean prior to the Messinian Salinity Crisis
- Autor(en)
- George Kontakiotis, Geanina A. Butiseacă, Assimina Antonarakou, Konstantina Agiadi, Stergios D. Zarkogiannis, Emilija Krsnik, Evangelia Besiou, Willem Jan Zachariasse, Lucas Lourens, Danae Thivaiou, Efterpi Koskeridou, Pierre Moissette, Andreas Mulch, Vasileios Karakitsios, Iuliana Vasiliev
- Abstrakt
This study describes the hydroclimate evolution of the eastern Mediterranean Basin during the early Messinian (7.2 to 6.5 Ma) time-interval based on analysis of a succession at Agios Myron (Crete, Greece), prior to the onset of the Messinian Salinity Crisis (5.96–5.33 Ma). Specifically, we report sea surface temperature and salinity reconstructions based on a combined analysis of biomarkers and oxygen isotopes of planktonic foraminifera. Data reveal that a negative water budget and strong hydrologic and climate variability characterized the eastern Mediterranean Basin at this time, and we identify three distinct phases. In Phase 1 (7.2–6.9 Ma), a shift to more positive oxygen isotope values in planktonic foraminifera at ~7.2 Ma is attributed to progressive gateway restriction of Mediterranean–Atlantic corridors and subsequent cooling until 6.9 Ma. In Phase 2 (6.9–6.7 Ma), distinct warm and hypersaline events (at 6.9–6.82 and 6.72 Ma) resulted in stressed marine microfauna during periods of strong evaporation. An important step-change in the Mediterranean restriction at 6.72 Ma may have resulted from shallowing of the Mediterranean gateways and reduced Mediterranean marine outflow. During Phase 3 (6.7–6.5 Ma) this gateway shallowing reduced the oceanic input into the Mediterranean Basin causing significant hydrological changes, reflected in a wide range of temperature and salinity fluctuations accompanied by enhanced water-column stratification. The data presented here counterbalance the general lack of quantitative temperature and especially salinity estimates available for the Mediterranean Messinian, time interval where we still highly rely on modelling for such evaluations. This study highlights the severity of preconditioning stages leading to the Messinian Salinity Crisis in the Mediterranean and sets values for extreme salinity conditions that could still host marine life.
- Organisation(en)
- Institut für Paläontologie
- Externe Organisation(en)
- National & Kapodistrian University of Athens, Senckenberg Forschungsinstitut und Naturmuseum, Johann Wolfgang Goethe-Universität Frankfurt am Main, University of Oxford, Utrecht University, Museum national d'Histoire Naturelle
- Journal
- Palaeogeography, Palaeoclimatology, Palaeoecology
- Band
- 592
- ISSN
- 0031-0182
- DOI
- https://doi.org/10.1016/j.palaeo.2022.110903
- Publikationsdatum
- 04-2022
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105112 Historische Geologie, 105123 Stratigraphie, 105101 Allgemeine Geologie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Oceanography, Ecology, Evolution, Behavior and Systematics, Earth-Surface Processes, Palaeontology
- Sustainable Development Goals
- SDG 13 – Maßnahmen zum Klimaschutz, SDG 14 – Leben unter Wasser
- Link zum Portal
- https://ucris.univie.ac.at/portal/de/publications/hypersalinity-accompanies-tectonic-restriction-in-the-eastern-mediterranean-prior-to-the-messinian-salinity-crisis(d0af65fb-f225-4f3d-8aae-25852af64723).html