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A new high-resolution Holocene tephra stratigraphy in eastern Iceland : Improving the Icelandic and North Atlantic tephrochronology

Gudmundsdóttir, Esther Ruth; Larsen, Gudrún; Björck, Svante LU ; Ingólfsson, Ólafur and Striberger, Johan LU (2016) In Quaternary Science Reviews 150. p.234-249
Abstract

A new and improved Holocene tephra stratigraphy and tephrochronological framework for eastern and northern Iceland is presented. Investigations of a sediment sequence from Lake Lögurinn have revealed a comprehensive tephra record spanning the last 10.200 years. A total of 157 tephra layers have been identified, whereof 149 tephra layers have been correlated to its source volcanic system using geochemistry, stratigraphy and age. Fifteen layers have chemical composition of two affinities that possibly represent two very closely spaced eruptions. Thus, these 157 tephra layers are believed to represent 172 explosive eruptions. Nineteen tephra marker layers have been identified in the Lake Lögurinn record (G1922, A1875, V1477, V1410, H1636,... (More)

A new and improved Holocene tephra stratigraphy and tephrochronological framework for eastern and northern Iceland is presented. Investigations of a sediment sequence from Lake Lögurinn have revealed a comprehensive tephra record spanning the last 10.200 years. A total of 157 tephra layers have been identified, whereof 149 tephra layers have been correlated to its source volcanic system using geochemistry, stratigraphy and age. Fifteen layers have chemical composition of two affinities that possibly represent two very closely spaced eruptions. Thus, these 157 tephra layers are believed to represent 172 explosive eruptions. Nineteen tephra marker layers have been identified in the Lake Lögurinn record (G1922, A1875, V1477, V1410, H1636, K1625, Ö1362, G1354, K1262, V874, Hrafnkatla, Sn-1, Grákolla, HY, H3, H4, HÖ, LL1755 and Reitsvík-8 tephra markers). New potential tephra markers are the silicic Askja L (∼9400 cal BP), the low titanium basalt layers, LL 1774 (∼10.150 cal BP) and LL 1755 (∼9990 cal BP), assigned to Veidivötn-Bárdarbunga and the tephra layers, LL 1527.8 (∼7850 cal BP), LL 911.2 (∼2370 cal BP), LL 908.4 (∼2350 cal BP), LL 781.9 (∼1930 cal BP), LL 644.4 (∼1480 cal BP), not yet correlated to a source volcanic system. A silicic tephra marker layer, Reitsvík 8, correlated to the Fosen tephra in Norway has been identified in Lake Lögurinn. The Lake Lögurinn tephra record has been connected and integrated with the Icelandic terrestrial tephrochronology and stratigraphy through 102 tephra layers, the marine tephra stratigraphy through 39 layers and overseas through 9 tephra layers. This record is the first high-resolution tephra stratigraphical and chronological framework for the Holocene in eastern Iceland as well as the most detailed and continuous record, and has considerable potential to serve as a key section or a stratotype for the Holocene in eastern Iceland and the North Atlantic.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
Holocene, Iceland, Lake Lögurinn, Tephra markers, Tephra stratigraphy, Tephrochronology
in
Quaternary Science Reviews
volume
150
pages
16 pages
publisher
Elsevier
external identifiers
  • Scopus:84985018857
ISSN
0277-3791
DOI
10.1016/j.quascirev.2016.08.011
language
English
LU publication?
yes
id
ba0159ea-d5bd-4663-b0ff-cf14893d7733
date added to LUP
2016-10-14 10:58:04
date last changed
2017-01-01 08:36:48
@article{ba0159ea-d5bd-4663-b0ff-cf14893d7733,
  abstract     = {<p>A new and improved Holocene tephra stratigraphy and tephrochronological framework for eastern and northern Iceland is presented. Investigations of a sediment sequence from Lake Lögurinn have revealed a comprehensive tephra record spanning the last 10.200 years. A total of 157 tephra layers have been identified, whereof 149 tephra layers have been correlated to its source volcanic system using geochemistry, stratigraphy and age. Fifteen layers have chemical composition of two affinities that possibly represent two very closely spaced eruptions. Thus, these 157 tephra layers are believed to represent 172 explosive eruptions. Nineteen tephra marker layers have been identified in the Lake Lögurinn record (G1922, A1875, V1477, V1410, H1636, K1625, Ö1362, G1354, K1262, V874, Hrafnkatla, Sn-1, Grákolla, HY, H3, H4, HÖ, LL1755 and Reitsvík-8 tephra markers). New potential tephra markers are the silicic Askja L (∼9400 cal BP), the low titanium basalt layers, LL 1774 (∼10.150 cal BP) and LL 1755 (∼9990 cal BP), assigned to Veidivötn-Bárdarbunga and the tephra layers, LL 1527.8 (∼7850 cal BP), LL 911.2 (∼2370 cal BP), LL 908.4 (∼2350 cal BP), LL 781.9 (∼1930 cal BP), LL 644.4 (∼1480 cal BP), not yet correlated to a source volcanic system. A silicic tephra marker layer, Reitsvík 8, correlated to the Fosen tephra in Norway has been identified in Lake Lögurinn. The Lake Lögurinn tephra record has been connected and integrated with the Icelandic terrestrial tephrochronology and stratigraphy through 102 tephra layers, the marine tephra stratigraphy through 39 layers and overseas through 9 tephra layers. This record is the first high-resolution tephra stratigraphical and chronological framework for the Holocene in eastern Iceland as well as the most detailed and continuous record, and has considerable potential to serve as a key section or a stratotype for the Holocene in eastern Iceland and the North Atlantic.</p>},
  author       = {Gudmundsdóttir, Esther Ruth and Larsen, Gudrún and Björck, Svante and Ingólfsson, Ólafur and Striberger, Johan},
  issn         = {0277-3791},
  keyword      = {Holocene,Iceland,Lake Lögurinn,Tephra markers,Tephra stratigraphy,Tephrochronology},
  language     = {eng},
  month        = {10},
  pages        = {234--249},
  publisher    = {Elsevier},
  series       = {Quaternary Science Reviews},
  title        = {A new high-resolution Holocene tephra stratigraphy in eastern Iceland : Improving the Icelandic and North Atlantic tephrochronology},
  url          = {http://dx.doi.org/10.1016/j.quascirev.2016.08.011},
  volume       = {150},
  year         = {2016},
}