Detection of the Askja AD 1875 cryptotephra in Latvia, Eastern Europe

Journal of Quaternary Science J Quaternary Science 0267-8179 1099-1417 05 2016 31 5 10.1002/jqs.v31.5 https://onlinelibrary.wiley.com/toc/10991417/31/5 Detection of the Askja AD 1875 cryptotephra in Latvia, Eastern Europe Normunds Stivrins Department of Geosciences and Geography University of Helsinki PO Box 64, FI‐00014 Helsinki Finland Institute of Geology Tallinn University of Technology Ehitajate tee 5 19086, Tallinn Estonia Lake and Peatland Research Centre Puikule LV‐4063 Latvia Sabine Wulf Senckenberg Research Institute and Natural History Museum BIK‐F, TSP6 Evolution and Climate Senckenberganlage 25 D‐60325 Frankfurt A. M. Germany GFZ German Research Centre for Geosciences Section − 5.2 Climate Dynamics and Landscape Evolution Telegrafengerg 14473, Potsdam Germany Institute for Geosciences Heidelberg University Im Neuenheimer Feld 234 D‐69120 Heidelberg Germany Stefan Wastegård Department of Physical Geography Stockholm University SE‐106 91 Stockholm Sweden Ewa M. Lind Department of Physical Geography Stockholm University SE‐106 91 Stockholm Sweden Tiiu Alliksaar Institute of Geology Tallinn University of Technology Ehitajate tee 5 19086, Tallinn Estonia Mariusz Gałka Department of Biogeography and Palaeoecology Faculty of Geographical and Geological Sciences Adam Mickiewicz University Dziegielowa 27 61–680, Poznań Poland Thorbjørn Joest Andersen Department of Geosciences and Natural Resource Management University of Copenhagen Oester Voldgade 10 1350 Copenhagen K Denmark Atko Heinsalu Institute of Geology Tallinn University of Technology Ehitajate tee 5 19086, Tallinn Estonia Heikki Seppä Department of Geosciences and Geography University of Helsinki PO Box 64, FI‐00014 Helsinki Finland Siim Veski Institute of Geology Tallinn University of Technology Ehitajate tee 5 19086, Tallinn Estonia ABSTRACT

We report the first geochemically confirmed findings of the Askja volcano (Iceland) AD 1875 eruption cryptotephra in Eastern Europe. The cryptotephra finding in Latvia is the easternmost finding of the Askja AD 1875 so far, providing an important time marker in the sediments. Although low concentrations of Askja AD 1875 rhyolitic glass shards were recorded, our findings suggest the possibility of also tracing other historical cryptotephras in lacustrine and peat sediments in Eastern Europe. We use the Askja AD 1875 tephra isochrone to synchronize pollen data of human activities, i.e . rye ( Secale cereale ) cultivation. Our comparison of Secale pollen from two sites reveals that there were minor dissimilarities in the timing of highest rye cultivation, and that a synchronous decrease of rye cultivation occurred at both sites few years after the Askja eruption at AD 1875.

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