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Extending the limits of the Borrobol Tephra to Scandinavia and detection of new early Holocene tephras

Published online by Cambridge University Press:  20 January 2017

Siwan M. Davies ,
Stefan Wastegård  and
Barbara Wohlfarth
Siwan M. Davies*
Affiliation:
Centre for Quaternary Research, Department of Geography, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, London, UK
Stefan Wastegård
Affiliation:
Department of Physical Geography and Quaternary Geology, Stockholm University, S-106 91, Stockholm, Sweden
Barbara Wohlfarth
Affiliation:
Department of Physical Geography and Quaternary Geology, Stockholm University, S-106 91, Stockholm, Sweden
*
*Corresponding author. Department of Physical Geography and Quaternary Geology, Stockholm University, S-106 91 Stockholm, Sweden. Email Address:siwan.davies@natgeo.su.se
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Abstract

Analyses of two infilled lakes in Blekinge, southeast Sweden, indicate the presence of at least three tephra horizons of Termination 1 and early Holocene age. Geochemical analyses confirm the presence of the Borrobol Tephra, the Askja Tephra (10,000 14C yr B.P.), and one previously unreported tephra of Icelandic origin. Extending the limits of the Borrobol Tephra to Scandinavia illustrates that this ash is far more widespread than previously realized and is therefore, an important marker horizon for determining the rate and timing of the initial warming at the start of Greenland Interstade 1 (GI-1) within Europe. The relatively unknown Askja Tephra and the newly discovered Hässeldalen Tephra are stratigraphically placed at the Younger Dryas/Preboreal transition. This paper demonstrates the suitability and success associated with the extraction techniques for tracing microtephra horizons in areas distal to volcanic sources.

Type
Articles
Information
Quaternary Research , Volume 59 , Issue 3 , May 2003 , pp. 345 - 352
Copyright
Elsevier Science (USA)

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