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Ultra-distal fine ash occurrences of the Icelandic Askja-S Plinian eruption deposits in Southern Carpathian lakes: New age constraints on a continental scale tephrostratigraphic marker

Kearney, R. and Albert, P.G. and Staff, R.A. and Pál, I. and Veres, D. and Magyari, E. and Bronk Ramsey, C. (2018) Ultra-distal fine ash occurrences of the Icelandic Askja-S Plinian eruption deposits in Southern Carpathian lakes: New age constraints on a continental scale tephrostratigraphic marker. QUATERNARY SCIENCE REVIEWS : THE INTERNATIONAL JOURNAL OF EARTH, CLIMATE AND LIFE INTERACTIONS, 188. pp. 174-182. ISSN 0277-3791 (print); 1873-457X (online) (In Press)

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Abstract

Here we present the results of the first cryptotephra investigation of two Late glacial-Holocene lake records from the Southern Carpathian Mountains in Romania, Lake Brazi and Lake Lia. The discovery of an important Icelandic tephrostratigraphic marker, the Askja-S, in the sedimentary records of both sites significantly extends the known ash dispersal from this Plinian eruption. Bayesian age-depth modelling of available radiocarbon (14C) data from both sedimentary records allows us to further refine the depositional age of this ultra-distal tephra. In combination with age constraints on the tephra from other well-dated European sites, we produce an updated age for this key tephrostratigraphic marker of 10,824 ± 97 cal yrs BP (95.4% range). The Askja-S tephra is stratigraphically positioned after the palaeoenvironmental proxy response to the Preboreal Oscillation at both sites. The widespread distribution of this tephra across Europe offers the potential to assess spatio-temporal variability of this climatic signal. The discovery of the Askja-S in lake records from the Southern Carpathians highlights the likelihood of finding other ultra-distal (Icelandic) cryptotephra marker layers within the region. Additionally, given the location of the Carpathian region, it offers the opportunity to further enhance and integrate tephrostratigraphic frameworks of north-western Europe with those of the Mediterranean and Anatolia regions, which will enable a more precise comparison of palaeoenvironmental archives across Europe.

Item Type: Article
Subjects: Q Science / természettudomány > QE Geology / földtudományok > QE05 Historical geology. Stratigraphy / Földtörténet, rétegtan
Q Science / természettudomány > QE Geology / földtudományok > QE06 Petrology. Petrography / kőzettan, petrográfia
Depositing User: Piroska Pazonyi
Date Deposited: 15 Nov 2021 13:25
Last Modified: 15 Nov 2021 13:25
URI: http://real.mtak.hu/id/eprint/133513

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