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Recommendations for using XRF core scanning as a tool in tephrochronology
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Geological Sciences. (Marine Geology)
2012 (English)In: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 22, no 3, 371-375 p.Article in journal (Refereed) Published
Abstract [en]

X-ray fluorescence (XRF) core scanning is a relatively new arrangement of a classic analytical technique which allows for non-destructive, in situ XRF analysis of sediment cores from submillimetre resolution upwards. In this contribution we explore the use of XRF core scanning for tephrochronology based on the analysis of three gyttja-rich sediment cores from the Faroe Islands. Using a combination of optical and radiographic images, analytical parameters and elemental profiles (Si, K, Ca, Ti, Mn, Fe, Sr and Zr), higher concentration basaltic tephra layers (>1000 shards/cm3) were positively identified. The XRF core scanning did not capture the lower concentration (<850 shards/cm3) rhyolitic layers found in the core. The elemental data generated for the detected tephra layers using XRF core scanning was not comparable to individual shard analysis by electron microprobe. We recommend using XRF core scanning for tephra screening in order to localize depths for high-resolution subsampling and to avoid depths where sediment mixing has caused tailing/mixing of the tephra signal. At the studied site the basaltic Saksunarvatn ash as well as a tephra belonging to the Askja-S/10 ka eruption were identified.

Place, publisher, year, edition, pages
Sage , 2012. Vol. 22, no 3, 371-375 p.
Keyword [en]
elemental data, Faroe Islands, gyttja, lake sediment, tephra, XRF core scanning
National Category
Earth and Related Environmental Sciences
Research subject
Quarternary Geology
Identifiers
URN: urn:nbn:se:su:diva-62889DOI: 10.1177/0959683611423688ISI: 000300436200010OAI: oai:DiVA.org:su-62889DiVA: diva2:445411
Note
4Available from: 2011-10-03 Created: 2011-10-03 Last updated: 2017-12-08Bibliographically 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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Publisher's full texthttp://hol.sagepub.com/content/early/2011/09/23/0959683611423688.abstract

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