Towards a Tephrochronology for the Lakselv Peat Sequence in Finnmark County, Northern Norway

To provide an increased breadth in the knowledge of tephra dispersal, this pilot study examines a peat core from Lakselv in Finnmark County in northern Norway. Peat samples are exposed to burning, HCl, density separation and polarized light microscopy. One sample from a depth of 37.5-40 cm was analy...

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Bibliographic Details
Main Author: Höglund, Anny
Format: Bachelor Thesis
Language:English
Published: Stockholms universitet, Institutionen för naturgeografi 2017
Subjects:
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145154
Description
Summary:To provide an increased breadth in the knowledge of tephra dispersal, this pilot study examines a peat core from Lakselv in Finnmark County in northern Norway. Peat samples are exposed to burning, HCl, density separation and polarized light microscopy. One sample from a depth of 37.5-40 cm was analysed using an electron microprobe analyser (EMPA). At least two tephra horizons were identified, one at a depth of 12.5-17.5 cm and one at 37.5-40 cm. The lower horizon shows a chemical composition similar to eruptives from Jan Mayen and São Miguel, Azores while the origin of the upper horizon is unknown as no geochemical analysis was performed for that depth.