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Nicolaj Krog Larsen

Holocene tephrostratigraphy in Vestfirðir, NW Iceland

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

DOI

  • Esther Ruth Gudmundsdóttir, University of Iceland
  • ,
  • Anders Schomacker, UiT-The Arctic University of Norway
  • ,
  • Skafti Brynjólfsson, Icelandic Institute of Natural History
  • ,
  • Ólafur Ingólfsson, University of Iceland
  • ,
  • Nicolaj K. Larsen

We present a tephra stratigraphical and tephrochronological record from eight lakes in Vestfirðir, NW Iceland. About 50 tephra units have been identified, representing nearly 30 eruptive events originating from five volcanic systems: Hekla, Katla, Snæfellsjökull, Grímsvötn and Veiðivötn-Bárðarbunga. Most of the tephra layers originate from Grímsvötn, although there is a prominent presence of andesitic to basaltic tephra layers from Hekla in the record. We propose that the previously described Brattihjalli tephra is actually the 6060-year-old Hekla Ö tephra marker layer, recording a more north-westerly dispersal than before and providing new correlation possibilities across Iceland. Thus, the Hekla Ö tephra covers as large an area in Iceland as the Hekla 5, Hekla 4, Hekla 3 and Hekla 1104 tephra layers, emphasizing its importance as a chronological marker. The tephra markers Hekla 1693, V877/Settlement layer, Sn-1, Hekla 3 and Hekla 4 have been found and, additionally, our study identifies four potential tephra markers, the Katla D1 ∼2750 cal a BP, Katla D2 ∼3700 cal a BP, Reykjarfjörður tephra ∼8800 cal a BP and Dagverðardalur tephra ∼9300–9500 cal a BP. Our data reveal several new tephra layers in Vestfirðir, including chronological markers important for dating and correlation.

OriginalsprogEngelsk
TidsskriftJournal of Quaternary Science
Vol/bind33
Nummer7
Sider (fra-til)827-839
Antal sider13
ISSN0267-8179
DOI
StatusUdgivet - okt. 2018

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