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Evaluating tephrochronology in the permafrost peatlands of nothern Sweden

Title data

Cooper, Claire L. ; Swindles, Graeme T. ; Watson, Elizabeth J. ; Savov, Ivan P. ; Galka, Mariusz ; Gallego-Sala, Angela ; Borken, Werner:
Evaluating tephrochronology in the permafrost peatlands of nothern Sweden.
In: Quaternary Geochronology. Vol. 50 (2019) . - pp. 16-28.
ISSN 1871-1014
DOI: https://doi.org/10.1016/j.quageo.2018.11.001

Abstract in another language

Tephrochronology is an increasingly important tool for the dating of sediment and peat profiles for palaeoecological, palaeoclimatic and archaeological research. However, although much work has been done on tephrain temperate peatlands, there have been very few in-depth investigations of permafrost peatlands. Here we present the analysis of nine peatland cores from Abisko, northern Sweden, and show that the presence of tephralayers may be highly variable even over a scale of<10 km. Using electron probe microanalysis (EPMA) combined with age-depth profiles compiled from radiocarbon (14C) and 210Pb dating of peat records, we identify the Hekla 1104, Hekla 1158, Hekla-Selsund and the Hekla 4 tephra layers. We also infer the presence of the Askja 1875 tephra, in addition to an unassigned tephra dating from between 1971–1987 AD in two separate cores. Five of the nine analysed cores do not contain distinct tephra layers. Volcanic ash deposits in northern Scandinavia are subject to both regional-scale variations in climate and atmospheric circulation, and local-scale variations on the order of tens of kilometres in topography, vegetation, snow cover, and ground permeability. The extremeinconsistency of tephra preservation within a small study area (∼3000 km2) brings into question the reliabilityof tephrochronology within permafrost peatlands, and highlights the necessity of alternative methods for datingpeat profiles in this region.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 28 Jan 2020 10:39
Last Modified: 28 Jan 2020 10:39
URI: https://eref.uni-bayreuth.de/id/eprint/53809