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A Younger Dryas Ash Bed in Western Norway, and Its Possible Correlations with Tephra in Cores from the Norwegian Sea and the North Atlantic

Published online by Cambridge University Press:  20 January 2017

Jan Mangerud
Affiliation:
Department of Geology, University of Bergen, Allégt. 41, N-5000 Bergen, Norway
Sven Erik Lie
Affiliation:
Department of Geology, University of Bergen, Allégt. 41, N-5000 Bergen, Norway
Harald Furnes
Affiliation:
Department of Geology, University of Bergen, Allégt. 41, N-5000 Bergen, Norway
Inger Lise Kristiansen
Affiliation:
Department of Geology, University of Bergen, Allégt. 41, N-5000 Bergen, Norway
Leif Lømo
Affiliation:
Department of Geology, University of Bergen, Allégt. 41, N-5000 Bergen, Norway

Abstract

A bed of volcanic ash up to 23 cm thick is found in lacustrine and marine sediments in western Norway. It is formally mamed the Vedde Ash Bed, and its age is approximately 10,600 yr B.P., i.e., mid-Younger Dryas. The bed consits of pure glass having a bimodal basaltic and rhyolitic composition. The geochemistry of the glass shards suggests an Icelandic source. By means of stratigraphic position and geochemistry, the ash is correlated with ash zones found in cores from the continental shelf, the Norwegian Sea, and the North Atlatic.

Type
Research Article
Copyright
University of Washington

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