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Faroe Marine Ash Zone IV: a new MIS 3 ash zone on the Faroe Islands margin
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2014 (English)In: Gas Generation and Migration in Deep Geological Radioactive Waste Repositories, London: The Geological Society Publishing House, 2014, Vol. 398, 81-93 p.Chapter in book (Refereed)
Abstract [en]

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 Grimsvotn 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.

Place, publisher, year, edition, pages
London: The Geological Society Publishing House, 2014. Vol. 398, 81-93 p.
Series
Geological Society Special Publications, 415
National Category
Other Earth and Related Environmental Sciences
Research subject
Quaternary Geology
Identifiers
URN: urn:nbn:se:su:diva-115191DOI: 10.1144/SP398.3OAI: oai:DiVA.org:su-115191DiVA: diva2:795948
Conference
Marine Tephrochronology
Note

Geological Society of London Meeting on Marine Tephrochronology, London, ENGLAND, OCT 26, 2011

Available from: 2015-03-17 Created: 2015-03-17 Last updated: 2015-05-12Bibliographically approved

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