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A Late Younger Dryas-Early Holocene tephrostratigraphy for Fosen, Central Norway
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Univ Copenhagen, Dept Geosci & Nat Resource Management.
2013 (English)In: Journal of Quaternary Science, ISSN 0267-8179, E-ISSN 1099-1417, Vol. 28, no 8, 803-811 p.Article in journal (Refereed) Published
Abstract [en]

A number of rapid climate oscillations occur during the Lateglacial-Early Holocene, 15-8 ka BP period and a well-developed tephrostratigraphy in association with these oscillations increases the possibilities to correlate climate archives around the North Atlantic. This paper presents a tephrostratigraphy for Fosen peninsula, Central Norway. Both the Vedde Ash ca.12.1 ka BP and the Saksunarvatn Ash approximate to 10.3 ka BP are important isochrones for correlations of Late Quaternary palaeoenvironmental records in the North Atlantic region and have been assigned ages in GICC05. Beside these tephras we have also identified a new tephra, the Fosen Tephra, with a Borrobol-type geochemistry that occurs above both the Vedde Ash and the Saksunarvatn Ash with an age approximate to 10.2 ka BP. Several tephras with Borrobol-type geochemistry have been identified around the North Atlantic. One group is the Borrobol/Penifiler tephras dated to Greenland Interstadial-1 and another group is dated to the Early Holocene. We suggest that some of the Early Holocene Borrobol-type tephras and the Fosen Tephra may actually be the same layer. If so, the Fosen Tephra is spread over a large area of the North Atlantic and has the potential to become an important marker for short-term climate variability in Scandinavia and in the northern hemisphere.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2013. Vol. 28, no 8, 803-811 p.
Keyword [en]
Fosen Tephra, Norway, Saksunarvatn Ash, Tephra, Vedde Ash
National Category
Physical Geography
Identifiers
URN: urn:nbn:se:su:diva-99143DOI: 10.1002/jqs.2676ISI: 000328348500006OAI: oai:DiVA.org:su-99143DiVA: diva2:686623
Note

AuthorCount:3;

Funding Agency:

SSAG (the Swedish Society for Anthropology and Geography); Swedish Research Council 

Available from: 2014-01-13 Created: 2014-01-12 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Tephra horizons in the North Atlantic region during the Early Holocene
Open this publication in new window or tab >>Tephra horizons in the North Atlantic region during the Early Holocene
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Uncertainties about the rate and magnitude of future climate change have drawn attention to the climate variability following the Late Glacial-Early Holocene transition, c. 12-8 ka BP. Tephrochronology is a method that uses volcanic ash as isochrons in order to link, date and synchronise geological and palaeoclimatic records which could provide a better understanding of short rapid climate shifts but also the timing of these.

The main purpose of this thesis was to improve and refine the Late Younger Dryas-Early Holocene (c. 12-8 ka BP) tephrochronological framework with focus on dating and identification of new and previously known tephra horizons in the North Atlantic region. A special emphasis was to identify tephra horizons contemporary to short rapid climate events that occurred during the period; the Preboreal Oscillation (c. 11.3 ka BP), the Erdalen events (c. 10.0-9.8 ka BP), the 9.3 ka BP and the 8.2 ka BP events. Additional purposes have been to evaluate the potential of XRF ITRAX core-scanning to identify tephra in lake sediments but also as a tool in palaeoclimate studies.

The potential of tephrochronology for linking climate archives across the North Atlantic region is a main outcome in this thesis. Specific results include five new tephra horizons; four identified on the Faroe Islands and one in Central Norway. Two previously known tephras, the Hässeldalen and Askja-S tephras, were identified on the Faroe Islands for the first time and at new locations in Sweden which confirmed their widespread distribution in NW Europe. Several of these tephras have the potential to become marker horizons for some of the short rapid climate events which occurred during the Late Younger Dryas-Early Holocene but their importance is yet to be determined. Further results show that the XRF core scanner can be used successfully to identify high concentrations of basaltic tephra but also to identify palaeoclimatic events in lake sediments.

Place, publisher, year, edition, pages
Stockholm: Department of Physical Geography and Quaternary Geology, Stockholm University, 2014. 116 p.
Series
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 41
Keyword
Tephrochronology, geochemical composition, Saksunarvatn Ash, Vedde Ash, Fosen Tephra, Askja-S, palaeoclimate, Younger Dryas, Early Holocene, “XRF ITRAX”, sediment geochemistry, stable isotopes, Faroe Islands, Norway, Sweden
National Category
Geology
Research subject
Quaternary Geology
Identifiers
urn:nbn:se:su:diva-99634 (URN)978-91-7447-847-1 (ISBN)
Public defence
2014-02-21, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 5: Manuscript.

Available from: 2014-01-30 Created: 2014-01-14 Last updated: 2014-01-22Bibliographically approved

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