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

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 o...

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Bibliographic Details
Published in:The Holocene
Main Authors: Wastegård, Stefan, Rundgren, Mats, Schoning, Kristian, Andersson, Sofia, Björck, Svante, Borgmark, Anders, Possnert, Göran
Format: Article in Journal/Newspaper
Language:English
Published: SAGE Publications 2008
Subjects:
Faroe Islands
Hekla
Iceland
Online Access:http://dx.doi.org/10.1177/0959683608089208
http://journals.sagepub.com/doi/pdf/10.1177/0959683608089208
Description
Summary: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.

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