Preprints
https://doi.org/10.5194/gchron-2022-26
https://doi.org/10.5194/gchron-2022-26
14 Nov 2022
 | 14 Nov 2022
Status: this preprint has been withdrawn by the authors.

Multiple Early Holocene eruptions of Katla produced tephra layers with similar composition to the Vedde Ash

David Harning, Thor Thordarson, Áslaug Geirsdóttir, Gifford Miller, and Christopher Florian

Abstract. The Vedde Ash, first described in Norway and dated to ~12000 cal a BP, has been taken to represent tephra derived from a large eruption of the Katla volcano in Iceland and dispersed across the North Atlantic and Europe. However, evidence for tephra layers with similar composition to the Vedde Ash, but of different ages, questions the utility of isolated Vedde-like tephra layers as reliable and independent age control. Here, we report three stratigraphically separated Early Holocene Katla tephra layers from the lake Torfdalsvatn, in north Iceland, that have bimodal chemical composition similar to the Vedde Ash. By using previously published conventional 14C ages and revised calibration curves, we provide new ages for these tephra layers of ~11375, 11360, and 11200 cal a BP – all substantially younger than the Vedde Ash. Torfdalsvatn’s record stands as an important reminder that repeated explosive eruptions of Iceland’s major volcanos during the deglacial cycle have produced multiple tephra plumes with similar geochemistry that may span 1000s of years. As a result, we urge caution when using isolated Icelandic tephra layers in distant regions as precise geochronometers without supporting age control.

This preprint has been withdrawn.

David Harning, Thor Thordarson, Áslaug Geirsdóttir, Gifford Miller, and Christopher Florian

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on gchron-2022-26', Jan Mangerud, 17 Nov 2022
    • AC1: 'Reply on CC1', David Harning, 28 Nov 2022
  • RC1: 'Comment on gchron-2022-26', Anonymous Referee #1, 22 Nov 2022
    • AC3: 'Reply on RC1', David Harning, 28 Nov 2022
  • CC2: 'Comment on gchron-2022-26', Simon Larsson, 23 Nov 2022
    • AC2: 'Reply on CC2', David Harning, 28 Nov 2022
  • RC2: 'Comment on gchron-2022-26', Anonymous Referee #2, 12 Jan 2023
    • AC4: 'Reply on RC2', David Harning, 13 Jan 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on gchron-2022-26', Jan Mangerud, 17 Nov 2022
    • AC1: 'Reply on CC1', David Harning, 28 Nov 2022
  • RC1: 'Comment on gchron-2022-26', Anonymous Referee #1, 22 Nov 2022
    • AC3: 'Reply on RC1', David Harning, 28 Nov 2022
  • CC2: 'Comment on gchron-2022-26', Simon Larsson, 23 Nov 2022
    • AC2: 'Reply on CC2', David Harning, 28 Nov 2022
  • RC2: 'Comment on gchron-2022-26', Anonymous Referee #2, 12 Jan 2023
    • AC4: 'Reply on RC2', David Harning, 13 Jan 2023
David Harning, Thor Thordarson, Áslaug Geirsdóttir, Gifford Miller, and Christopher Florian
David Harning, Thor Thordarson, Áslaug Geirsdóttir, Gifford Miller, and Christopher Florian

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Latest update: 21 Jan 2024
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This preprint has been withdrawn.

Short summary
Volcanic ash layers are a common tool to synchronize records of past climate, and their estimated age relies on external dating methods. Here, we show that the chemical composition of the well-known, 12000 year-old Vedde Ash is indistinguishable with several other ash layers in Iceland that are ~1000 years younger. Therefore, chemical composition alone cannot be used to identify the Vedde Ash in sedimentary records.