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The geographical extent of the “L2-Tephra”: a widespread marker horizon for the penultimate glacial (MIS 6) on the Balkan Peninsula

Abstract

The magnitude of volcanic eruptions and the volume of ejected magma control amongst other factors the thickness and geographical extent of tephra layers. Here we present and discuss new data on the extent of the “L2-Tephra” preserved in loess-palaeosol sequences (LPSs) on the Balkan Peninsula. Magnetic susceptibility and colorimetric data from the LPSs of Zemun (in the vicinity of Belgrade, Serbia) and Mircea Voda (Dobrogea, Romania) provide new evidence for the western-and easternmost extent of the “L2-Tephra” and shedding new light on the potential magnitude of the environmental impact of the related volcanic event during marine isotope stage (MIS) 6.Tephra chronology provides independent age control in various sedimentary archives by direct radiometric dating of tephras itself or linking tephras back to their dated volcanic source. With a tephra-based time-frame, sedimentary archives of quite diverse facies can be correlated unambiguously. Such an approach is already realized for several sedimentary archives worldwide and it is intended to be applied also for loess profiles on the Balkan Peninsula (compare Radaković et al., INTAV conference abstract). The “L2-Tephra” could serve as an unambiguous tie point between loess records and other (lacustrine, marine) archives.We show that the “L2-Tephra”, named after its position in loess unit L2, approximately equivalent to MIS 6 (Marković et al. 2015), could be traced in LPSs of the northern Balkan Peninsula from Croatia (Vukovar) in the West to the Black Sea coast in the East (e.g. Mircea Voda LPS). The “L2-Tephra” is a potential equivalent of one of the tephra layers found in Lake Ohrid (Macedonia) and in the Fucino lacustrine basin (Italy): OH-DP-0617-Vico Ignimbrite B (162± 6 ka), OH-DP-0624-CF-V5-Pitigliano Tuff (163 ± 22 ka) (Leicher et al. 2016) and TF-15, TF-16, TF-17 (dated to 150 -160 ka) (Giaccioet al. 2017) in Lake Ohrid and Fucino basin, respectively. These widespread tephra layers originated in the Neapolitan area (Italy) and the combined field evidence of increasing “L2-Tephra” thickness from northern Serbia towards the South, gives rise to the assumption that the “L2-Tephra eruption” had a much more severe impact on climate and ecosystems of the Balkan Peninsula (and beyond) than previously thought.

Bibliography

Laag, C., Hambach, U., Botezatu, A., Baykal, Y., Veres, D., Schönwetter, T., Viola, J., Zeeden, C., Radakovic, L., Obreht, I., Jovaniovic, M., Bösken, J., Lehmkuhl, F., Markovic, S. (2018): The geographical extent of the “L2-Tephra”: a widespread marker horizon for the penultimate glacial (MIS 6) on the Balkan Peninsula. INQUA-INTAV International Field Conference and Workshop - Crossing New Frontiers - Tephra Hunt in Transylvania, INTAV, 24.06.-29.06.2018, Moieciu de Sus, Romania

Authors Laag, C. and Hambach, U. and Botezatu, A. and Baykal, Y. and Veres, D. and Schönwetter, T. and Viola, J. and Zeeden, C. and Radakovic, L. and Obreht, I. and Jovaniovic, M. and Bösken, J. and Lehmkuhl, F. and Markovic, S.
Type poster
Title The geographical extent of the “L2-Tephra”: a widespread marker horizon for the penultimate glacial (MIS 6) on the Balkan Peninsula
Year 2018
Organization INQUA-INTAV International Field Conference and Workshop - Crossing New Frontiers - Tephra Hunt in Transylvania, INTAV, 24.06.-29.06.2018, Moieciu de Sus, Romania
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