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Faroe Marine Ash Zone IV: a new MIS 3 ash zone on the Faroe Islands margin

By
Stefan Wastegård
Stefan Wastegård
1
Department of Physical Geography and Quaternary Geology, Stockholm University, SE-10691 Stockholm, Sweden
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Tine L. Rasmussen
Tine L. Rasmussen
2
Department of Geology, University of Tromsø, Dramsveien 210, NO-9037, Tromsø, Norway
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Published:
January 01, 2014

Abstract

A basaltic tephra layer from MIS 3 has been discovered by analysis of cores from the Faroe Islands margin. The tephra layer appears up to 20 cm thick in some records. After the first main fall-out event the tephra is believed to be mainly deposited and redistributed by bottom currents. Geochemical analyses suggest that the tephra is relatively undisturbed by allochtonous tephra grains and unmixed. The peak occurrences are in the lower part of GIS (Greenland Interstadial) 12 and we suggest naming this new tephra Faroe Marine Ash Zone IV (FMAZ IV), following the nomenclature adopted for previous ash zones found on the Faroe Islands margin. Geochemical analyses of the tephra show affinities with the Grímsvötn volcanic system in the Eastern Volcanic Zone in south Iceland. The average age of FMAZ IV from four independent age models is 46 800±1000 years BP. We suggest that the V5 ash zone, found on the Reykjanes Ridge is a correlative to the FMAZ IV.

Supplementary material:

Single-grain analyses of tephra from FMAZ IV in cores from the northern Faroe margin and the central Faroe-Shetland Channel are available at http://www.geolsoc.org.uk/SUP18714

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Contents

Geological Society, London, Special Publications

Marine Tephrochronology

W. E. N. Austin
W. E. N. Austin
University of St Andrews, UK
The Scottish Association for Marine Science, UK
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P. M. Abbott
P. M. Abbott
Swansea University, UK
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S. M. Davies
S. M. Davies
Swansea University, UK
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N. J. G. Pearce
N. J. G. Pearce
Aberystwyth University, UK
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S. Wastegård
S. Wastegård
Stockholm University, Sweden
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Geological Society of London
Volume
398
ISBN electronic:
9781862396746
Publication date:
January 01, 2014

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