Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Biogeosciences, 13, 1179-1196, 2016
http://www.biogeosciences.net/13/1179/2016/
doi:10.5194/bg-13-1179-2016
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
26 Feb 2016
Sedimentological processes and environmental variability at Lake Ohrid (Macedonia, Albania) between 637 ka and the present
Alexander Francke1, Bernd Wagner1, Janna Just1, Niklas Leicher1, Raphael Gromig1, Henrike Baumgarten2, Hendrik Vogel3, Jack H. Lacey4,5, Laura Sadori6, Thomas Wonik2, Melanie J. Leng4,5, Giovanni Zanchetta7, Roberto Sulpizio8,9, and Biagio Giaccio10 1Institute of Geology and Mineralogy, University of Cologne, Cologne, Germany
2Leibniz Institute for Applied Geophysics (LIAG), Hannover, Germany
3Institute of Geological Sciences & Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
4Centre for Environmental Geochemistry, School of Geography, University of Nottingham, Nottingham, UK
5NERC Isotope Geosciences Facilities, British Geological Survey, Keyworth, Nottingham, UK
6Dipartimento di Biologia Ambientale, Università di Roma “La Sapienza”, Rome, Italy
7Dipartimento di Scienze della Terra, University of Pisa, Pisa, Italy
8Dipartimento di Scienze della Terra e Geoambientali, University of Bari, Bari, Italy
9Istituto per la Dinamica dei Processi Ambientali (IDPA) CNR, Milan, Italy
10Istituto di Geologia Ambientale e Geoingegneria – CNR, Rome, Italy
Abstract. Lake Ohrid (Macedonia, Albania) is thought to be more than 1.2 million years old and host more than 300 endemic species. As a target of the International Continental scientific Drilling Program (ICDP), a successful deep drilling campaign was carried out within the scope of the Scientific Collaboration on Past Speciation Conditions in Lake Ohrid (SCOPSCO) project in 2013. Here, we present lithological, sedimentological, and (bio-)geochemical data from the upper 247.8 m composite depth of the overall 569 m long DEEP site sediment succession from the central part of the lake. According to an age model, which is based on 11 tephra layers (first-order tie points) and on tuning of bio-geochemical proxy data to orbital parameters (second-order tie points), the analyzed sediment sequence covers the last 637 kyr.

The DEEP site sediment succession consists of hemipelagic sediments, which are interspersed by several tephra layers and infrequent, thin (< 5 cm) mass wasting deposits. The hemipelagic sediments can be classified into three different lithotypes. Lithotype 1 and 2 deposits comprise calcareous and slightly calcareous silty clay and are predominantly attributed to interglacial periods with high primary productivity in the lake during summer and reduced mixing during winter. The data suggest that high ion and nutrient concentrations in the lake water promoted calcite precipitation and diatom growth in the epilimnion during MIS15, 13, and 5. Following a strong primary productivity, highest interglacial temperatures can be reported for marine isotope stages (MIS) 11 and 5, whereas MIS15, 13, 9, and 7 were comparably cooler. Lithotype 3 deposits consist of clastic, silty clayey material and predominantly represent glacial periods with low primary productivity during summer and longer and intensified mixing during winter. The data imply that the most severe glacial conditions at Lake Ohrid persisted during MIS16, 12, 10, and 6, whereas somewhat warmer temperatures can be inferred for MIS14, 8, 4, and 2. Interglacial-like conditions occurred during parts of MIS14 and 8.


Citation: Francke, A., Wagner, B., Just, J., Leicher, N., Gromig, R., Baumgarten, H., Vogel, H., Lacey, J. H., Sadori, L., Wonik, T., Leng, M. J., Zanchetta, G., Sulpizio, R., and Giaccio, B.: Sedimentological processes and environmental variability at Lake Ohrid (Macedonia, Albania) between 637 ka and the present, Biogeosciences, 13, 1179-1196, doi:10.5194/bg-13-1179-2016, 2016.
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Short summary
Lake Ohrid (Macedonia, Albania) is thought to be more than 1.2 million years old. To recover a long paleoclimate record for the Mediterranean region, a deep drilling was carried out in 2013 within the scope of the Scientific Collaboration on Past Speciation Conditions in Lake Ohrid (SCOPSCO) project. Here, we present lithological, sedimentological, and (bio-)geochemical data from the upper 247.8 m composite depth of the overall 569 m long DEEP site record.
Lake Ohrid (Macedonia, Albania) is thought to be more than 1.2 million years old. To recover a...
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