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A tephra lattice for Greenland and a reconstruction of volcanic events spanning 25–45 ka b2k

A tephra lattice for Greenland and a reconstruction of volcanic events spanning 25–45 ka b2k
A tephra lattice for Greenland and a reconstruction of volcanic events spanning 25–45 ka b2k
Tephra layers preserved within the Greenland ice-cores are crucial for the independent synchronisation of these high-resolution records to other palaeoclimatic archives. Here we present a new and detailed tephrochronological framework for the time period 25,000–45,000 a b2k that brings together results from 4 deep Greenland ice-cores. In total, 99 tephra deposits, the majority of which are preserved as cryptotephra, are described from the NGRIP, NEEM, GRIP and DYE-3 records. The major element signatures of single glass shards within these deposits indicate that 93 are basaltic in composition all originating from Iceland. Specifically, 43 originate from Grimsvötn, 20 are thought to be sourced from the Katla volcanic system and 17 show affinity to the Kverkfjöll system. Robust geochemical characterisations, independent ages derived from the GICC05 ice-core chronology, and the stratigraphic positions of these deposits relative to the Dansgaard-Oeschger climate events represent a key framework that provides new information on the frequency and nature of volcanic events in the North Atlantic region between GS-3 and GI-12. Of particular importance are 19 tephra deposits that lie on the rapid climatic transitions that punctuate the last glacial period. This framework of well-constrained, time-synchronous tie-lines represents an important step towards the independent synchronisation of marine, terrestrial and ice-core records from the North Atlantic region, in order to assess the phasing of rapid climatic changes during the last glacial period.
0277-3791
122-141
Bourne, Anna
ca184ead-1dc3-4b0f-8a01-cb427838d996
Cook, Eliza
6369b0c4-2012-4d98-9396-e24712d3509c
Abbott, Peter
4cae8397-f61b-4b0a-a86c-f76615381cce
Seierstad, Inger
55809cfb-b674-47dd-853b-619916d4de1e
Stefffensen, Jørgen
7996351a-81d9-4803-98ee-4adcdab6d084
Svensson, Anders
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Fischer, Hubertus
3b3c8ebf-7454-4703-9a89-55ffd2152635
Schüpbach, Simon
7edafb3d-b221-42c4-b412-90a41ba88dd5
Davies, Siwan
c688786e-1d86-4198-9b72-83de5baa1a7f
Bourne, Anna
ca184ead-1dc3-4b0f-8a01-cb427838d996
Cook, Eliza
6369b0c4-2012-4d98-9396-e24712d3509c
Abbott, Peter
4cae8397-f61b-4b0a-a86c-f76615381cce
Seierstad, Inger
55809cfb-b674-47dd-853b-619916d4de1e
Stefffensen, Jørgen
7996351a-81d9-4803-98ee-4adcdab6d084
Svensson, Anders
4deba790-08f3-4dfd-9998-601977b7d897
Fischer, Hubertus
3b3c8ebf-7454-4703-9a89-55ffd2152635
Schüpbach, Simon
7edafb3d-b221-42c4-b412-90a41ba88dd5
Davies, Siwan
c688786e-1d86-4198-9b72-83de5baa1a7f

Bourne, Anna, Cook, Eliza and Abbott, Peter et al. (2015) A tephra lattice for Greenland and a reconstruction of volcanic events spanning 25–45 ka b2k. [in special issue: Synchronising Environmental and Archaeological Records using Volcanic Ash Isochrons] Quaternary Science Reviews, 118, 122-141. (doi:10.1016/j.quascirev.2014.07.017).

Record type: Article

Abstract

Tephra layers preserved within the Greenland ice-cores are crucial for the independent synchronisation of these high-resolution records to other palaeoclimatic archives. Here we present a new and detailed tephrochronological framework for the time period 25,000–45,000 a b2k that brings together results from 4 deep Greenland ice-cores. In total, 99 tephra deposits, the majority of which are preserved as cryptotephra, are described from the NGRIP, NEEM, GRIP and DYE-3 records. The major element signatures of single glass shards within these deposits indicate that 93 are basaltic in composition all originating from Iceland. Specifically, 43 originate from Grimsvötn, 20 are thought to be sourced from the Katla volcanic system and 17 show affinity to the Kverkfjöll system. Robust geochemical characterisations, independent ages derived from the GICC05 ice-core chronology, and the stratigraphic positions of these deposits relative to the Dansgaard-Oeschger climate events represent a key framework that provides new information on the frequency and nature of volcanic events in the North Atlantic region between GS-3 and GI-12. Of particular importance are 19 tephra deposits that lie on the rapid climatic transitions that punctuate the last glacial period. This framework of well-constrained, time-synchronous tie-lines represents an important step towards the independent synchronisation of marine, terrestrial and ice-core records from the North Atlantic region, in order to assess the phasing of rapid climatic changes during the last glacial period.

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Bourne et al., 2015b pre proofs.pdf - Accepted Manuscript
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Accepted/In Press date: 21 July 2014
e-pub ahead of print date: 28 August 2014
Published date: 15 June 2015
Organisations: Palaeoenvironment Laboratory (PLUS)

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Local EPrints ID: 401624
URI: https://eprints.soton.ac.uk/id/eprint/401624
ISSN: 0277-3791
PURE UUID: 8fc73cca-2f4b-48c8-95c5-f0c3f0a88da4
ORCID for Anna Bourne: ORCID iD orcid.org/0000-0003-1506-6160

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Date deposited: 26 Jan 2017 09:17
Last modified: 20 Jul 2019 00:28

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Contributors

Author: Anna Bourne ORCID iD
Author: Eliza Cook
Author: Peter Abbott
Author: Inger Seierstad
Author: Jørgen Stefffensen
Author: Anders Svensson
Author: Hubertus Fischer
Author: Simon Schüpbach
Author: Siwan Davies

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