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Tracing marine cryptotephras in the North Atlantic during the Last Glacial Period: improving the North Atlantic marine tephrostratigraphic framework

Tracing marine cryptotephras in the North Atlantic during the Last Glacial Period: improving the North Atlantic marine tephrostratigraphic framework
Tracing marine cryptotephras in the North Atlantic during the Last Glacial Period: improving the North Atlantic marine tephrostratigraphic framework
Tephrochronology is increasingly being recognised as a key tool for the correlation of disparate palaeoclimatic archives, underpinning chronological models and facilitating climatically independent comparisons of climate proxies. Tephra frameworks integrating both distal and proximal tephra occurrences are essential to these investigations providing key details on their spatial distributions, geochemical signatures, eruptive sources as well as any available chronological and/or stratigraphic information. Frameworks also help to avoid mis-correlation of horizons and provide important information on volcanic history. Here we present a comprehensive chronostratigraphic framework of 14 tephra horizons from North Atlantic marine sequences spanning 60-25 cal ka BP. Horizons previously discovered as visible or coarse-grained deposits have been combined with 11 newly recognised volcanic deposits, identified through the application of cryptotephra identification and characterisation methods to a wide network of marine sequences. Their isochronous integrity has been assessed using their physical characteristics. All horizons originated from Iceland with the vast majority having a basaltic composition sourced from the Grímsvötn, Kverkfjöll, Hekla/Vatnafjöll and Katla volcanic systems. New occurrences, improved stratigraphic placements and a refinement of the geochemical signature of the NAAZ II are reported and the range of the FMAZ IV has been extended. In addition, several significant geochemical populations that further investigations could show to be isochronous are reported. This tephra framework provides the foundation for the correlation and synchronisation of these marine records to the Greenland ice-cores and European terrestrial records to investigate the phasing, rate, timing and mechanisms controlling rapid climate changes that characterised the last glacial period.
0277-3791
169-186
Abbott, Peter
e2e4b4ed-7dcd-47da-bbd0-d21912721ff1
Griggs, Adam
a3fd6da1-cbb7-44ef-9fd3-b318dd133764
Bourne, Anna
ca184ead-1dc3-4b0f-8a01-cb427838d996
Chapman, Mark
04972ceb-6931-4fcc-a5c8-13bc195f6e10
Davies, Siwan
5b66c01e-0d8f-4884-b088-a28408fb210a
Abbott, Peter
e2e4b4ed-7dcd-47da-bbd0-d21912721ff1
Griggs, Adam
a3fd6da1-cbb7-44ef-9fd3-b318dd133764
Bourne, Anna
ca184ead-1dc3-4b0f-8a01-cb427838d996
Chapman, Mark
04972ceb-6931-4fcc-a5c8-13bc195f6e10
Davies, Siwan
5b66c01e-0d8f-4884-b088-a28408fb210a

Abbott, Peter, Griggs, Adam, Bourne, Anna, Chapman, Mark and Davies, Siwan (2018) Tracing marine cryptotephras in the North Atlantic during the Last Glacial Period: improving the North Atlantic marine tephrostratigraphic framework. Quaternary Science Reviews, 189, 169-186. (doi:10.1016/j.quascirev.2018.03.023).

Record type: Article

Abstract

Tephrochronology is increasingly being recognised as a key tool for the correlation of disparate palaeoclimatic archives, underpinning chronological models and facilitating climatically independent comparisons of climate proxies. Tephra frameworks integrating both distal and proximal tephra occurrences are essential to these investigations providing key details on their spatial distributions, geochemical signatures, eruptive sources as well as any available chronological and/or stratigraphic information. Frameworks also help to avoid mis-correlation of horizons and provide important information on volcanic history. Here we present a comprehensive chronostratigraphic framework of 14 tephra horizons from North Atlantic marine sequences spanning 60-25 cal ka BP. Horizons previously discovered as visible or coarse-grained deposits have been combined with 11 newly recognised volcanic deposits, identified through the application of cryptotephra identification and characterisation methods to a wide network of marine sequences. Their isochronous integrity has been assessed using their physical characteristics. All horizons originated from Iceland with the vast majority having a basaltic composition sourced from the Grímsvötn, Kverkfjöll, Hekla/Vatnafjöll and Katla volcanic systems. New occurrences, improved stratigraphic placements and a refinement of the geochemical signature of the NAAZ II are reported and the range of the FMAZ IV has been extended. In addition, several significant geochemical populations that further investigations could show to be isochronous are reported. This tephra framework provides the foundation for the correlation and synchronisation of these marine records to the Greenland ice-cores and European terrestrial records to investigate the phasing, rate, timing and mechanisms controlling rapid climate changes that characterised the last glacial period.

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Abbott et al. TRACE Framework Paper Open Access (002) - Accepted Manuscript
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Accepted/In Press date: 14 March 2018
e-pub ahead of print date: 25 April 2018
Published date: 1 June 2018

Identifiers

Local EPrints ID: 420139
URI: http://eprints.soton.ac.uk/id/eprint/420139
ISSN: 0277-3791
PURE UUID: b10dbf74-4d47-40db-a0ad-d119d13dc5df
ORCID for Anna Bourne: ORCID iD orcid.org/0000-0003-1506-6160

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Date deposited: 27 Apr 2018 16:30
Last modified: 17 Dec 2019 05:28

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