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The Holocene, Vol. 18, No. 4, 539-549 (2008)
DOI: 10.1177/0959683608089208

Age, geochemistry and distribution of the mid-Holocene Hekla-S/Kebister tephra

Stefan Wastegård

Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden, stefan.wastegard{at}geo.su.se

Mats Rundgren

GeoBiosphere Science Centre, Quaternary Sciences, University of Lund, Sölvegatan 12, SE-223 62 Lund, Sweden

Kristian Schoning

Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden

Sofia Andersson

Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden

Svante Björck

GeoBiosphere Science Centre, Quaternary Sciences, University of Lund, Sölvegatan 12, SE-223 62 Lund, Sweden

Anders Borgmark

Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden

Göran Possnert

Ångström Laboratory, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden

The middle Holocene Hekla-S/Kebister tephra originates in the Hekla volcanic system on SW Iceland. The distal distribution of the tephra includes the Faroe Islands, Shetland and Central Sweden, indicating a main dispersal towards the east. The chemical composition of the tephra follows the pattern of other major eruptions of Hekla, and ratios between selected oxides may in some cases allow separation from other major Holocene tephras from Hekla. Tephra from the Plinian phase dominates in eastern sites, while tephra also from later phases is found in the Faroe sites. Wiggle-matching of radiocarbon dates around the tephra in a Swedish peat-bog suggests an age around 3720 cal. yr BP (3750—3700 cal. yr BP), which is in accordance with previous attempts to date this tephra. This is within a period with significant climate changes in NW Europe and opens possibilities for exact comparisons of peat and lake sediment records from different geographical areas.

Key Words: Hekla • Kebister tephra • geochemistry • radiocarbon • Holocene • wiggle-matching • peat • North Atlantic region.


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