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., Albert, P.G., Staff, R.A. , Pál, I., Veres, D., 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, 188, pp. 174-182. (doi:10.1016/j.quascirev.2018.03.035)

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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:Articles
Additional Information:RK is funded by the UK National Environmental Research Council (NERC; grants: NE/L002612/1) as part of the Environmental Research Doctoral Training Program at the University of Oxford. PGA and RAS are supported by Early Career Fellowships from the Leverhulme Trust (grants: ECF-2014-438 and ECF-2015-396). Drilling and palaeoenvironmental study of Lake Brazi and Lake Lia was supported by the Hungarian OTKA grantNF 101362 and GINOP-2.3.2-15-2016-00009. EU-DEM map produced using Copernicus data and information funded by the European Union – EU-DEM layers.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Staff, Dr Richard
Authors: Kearney, R., Albert, P.G., Staff, R.A., Pál, I., Veres, D., Magyari, E., and Bronk Ramsey, C.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Quaternary Science Reviews
Publisher:Elsevier
ISSN:0277-3791
ISSN (Online):1873-457X
Published Online:10 April 2018
Copyright Holders:Copyright © 2018 Elsevier Ltd.
First Published:First published in Quaternary Science Reviews 188: 174-182
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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