Change search
ReferencesLink to record
Permanent link

Direct link
Re-evaluation and extension of the Marine Isotope Stage 5 tephrostratigraphy of the Faroe Islands region: The cryptotephra record
Show others and affiliations
Number of Authors: 7
2014 (English)In: Palaeogeography, Palaeoclimatology, Palaeoecology, ISSN 0031-0182, E-ISSN 1872-616X, Vol. 409, 153-168 p.Article in journal (Refereed) Published
Abstract [en]

Previous studies of marine sequences from the Faroe Islands region have identified a series of coarse-grained tephra horizons deposited during Marine Isotope Stage (MIS) 5. Here we reassess the MIS 5 tephrostratigraphy of the Faroe Islands region and focus on the cryptotephra deposits preserved within the fine-grained fraction of marine core LINK 16. We also extend the record to encompass the late MIS 6 and early MIS 4 periods. A density separation technique, commonly used for tephra investigations in lacustrine settings but rarely applied to marine sediments, is utilised to explore the fine-grained material and EPMA and LA-ICP-MS are employed to determine the major and trace element composition of individual tephra shards. In total, 3 basaltic and 3 rhyolitic Icelandic cryptotephra deposits with homogeneous geochemical compositions are identified - all of which have the potential to act as isochronous tie-lines. Geochemical results highlight that the Grimsvotn volcanic system of Iceland is the predominant source of the basaltic horizons and the Oraefajokull or Torfajokull systems are the likely sources of the rhyolitic deposits. Three of the horizons have been previously recognised in Faroe Islands region marine sequences, with two of these deposits traceable into a Norwegian Sea sequence. An early MIS 4 rhyolitic horizon is the most widespread deposit as it can be traced into the Norwegian Sea and to the south into a record from the Rockall Trough. Basaltic and rhyolitic horizons deposited during late MIS 6 have not been recognised in other sequences and represent new additions to the regional tephrostratigraphy.

Place, publisher, year, edition, pages
2014. Vol. 409, 153-168 p.
Keyword [en]
Volcanic ash, Iceland, Marine sequences, Isochrons, Palaeoclimatic synchronisation
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-106738DOI: 10.1016/j.palaeo.2014.05.004ISI: 000339144400013OAI: diva2:739137


Available from: 2014-08-20 Created: 2014-08-19 Last updated: 2014-08-20Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Wastegård, Stefan
By organisation
Department of Physical Geography and Quaternary Geology
In the same journal
Palaeogeography, Palaeoclimatology, Palaeoecology
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 433 hits
ReferencesLink to record
Permanent link

Direct link