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Last glacial period cryptotephra deposits in an eastern North Atlantic marine sequence: exploring linkages to the Greenland ice-cores

Last glacial period cryptotephra deposits in an eastern North Atlantic marine sequence: exploring linkages to the Greenland ice-cores
Last glacial period cryptotephra deposits in an eastern North Atlantic marine sequence: exploring linkages to the Greenland ice-cores
The establishment of a tephra framework for the Greenland ice-cores spanning the last glacial period, particularly between 25 and 45 ka b2k, provides strong potential for precisely correlating other palaeoclimatic records to these key archives. Tephra-based synchronisation allows the relative timing of past climatic changes recorded within different depositional environments and potential causal mechanisms to be assessed. Recent studies of North Atlantic marine records have demonstrated the potential of tracing cryptotephra horizons in these sequences and the development of protocols now allows a careful assessment of the isochronous nature of such horizons. Here we report on tephrochronological investigations of a marine sequence retrieved from the Goban Spur, Eastern North Atlantic, covering ?25–60 ka b2k. Density and magnetic separation techniques and an assessment of potential transport and depositional mechanisms have identified three previously unknown isochronous tephra horizons along with deposits of the widespread North Atlantic Ash Zone II and Faroe Marine Ash Zone III. Correlations between the new horizons and the Greenland ice-core tephra framework are explored and despite no tie-lines being identified the key roles that high-resolution climatostratigraphy and shard-specific trace element analysis can play within the assessment of correlations is demonstrated. The previously unknown horizons are new additions to the overall North Atlantic tephra framework for the last glacial period and could be key horizons for future correlations.
1871-1014
62-76
Abbott, Peter
4cae8397-f61b-4b0a-a86c-f76615381cce
Bourne, Anna
ca184ead-1dc3-4b0f-8a01-cb427838d996
Purcell, Catherine
cda094b0-865e-4122-9e2c-c244b13b8748
Davies, Siwan
c688786e-1d86-4198-9b72-83de5baa1a7f
Scourse, James
ba90dfd0-a440-4e94-8dcc-ad81080123a2
Pearce, Nick
469ac3fc-1358-4c2a-81fc-bbcedc97b39a
Abbott, Peter
4cae8397-f61b-4b0a-a86c-f76615381cce
Bourne, Anna
ca184ead-1dc3-4b0f-8a01-cb427838d996
Purcell, Catherine
cda094b0-865e-4122-9e2c-c244b13b8748
Davies, Siwan
c688786e-1d86-4198-9b72-83de5baa1a7f
Scourse, James
ba90dfd0-a440-4e94-8dcc-ad81080123a2
Pearce, Nick
469ac3fc-1358-4c2a-81fc-bbcedc97b39a

Abbott, Peter, Bourne, Anna and Purcell, Catherine et al. (2016) Last glacial period cryptotephra deposits in an eastern North Atlantic marine sequence: exploring linkages to the Greenland ice-cores. Quaternary Geochronology, 31, 62-76. (doi:10.1016/j.quageo.2015.11.001).

Record type: Article

Abstract

The establishment of a tephra framework for the Greenland ice-cores spanning the last glacial period, particularly between 25 and 45 ka b2k, provides strong potential for precisely correlating other palaeoclimatic records to these key archives. Tephra-based synchronisation allows the relative timing of past climatic changes recorded within different depositional environments and potential causal mechanisms to be assessed. Recent studies of North Atlantic marine records have demonstrated the potential of tracing cryptotephra horizons in these sequences and the development of protocols now allows a careful assessment of the isochronous nature of such horizons. Here we report on tephrochronological investigations of a marine sequence retrieved from the Goban Spur, Eastern North Atlantic, covering ?25–60 ka b2k. Density and magnetic separation techniques and an assessment of potential transport and depositional mechanisms have identified three previously unknown isochronous tephra horizons along with deposits of the widespread North Atlantic Ash Zone II and Faroe Marine Ash Zone III. Correlations between the new horizons and the Greenland ice-core tephra framework are explored and despite no tie-lines being identified the key roles that high-resolution climatostratigraphy and shard-specific trace element analysis can play within the assessment of correlations is demonstrated. The previously unknown horizons are new additions to the overall North Atlantic tephra framework for the last glacial period and could be key horizons for future correlations.

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Abbottetal-TRACE-2820CQ-GREENACCESS.PDF - Accepted Manuscript
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Accepted/In Press date: 4 November 2015
e-pub ahead of print date: 7 November 2015
Published date: February 2016
Organisations: Palaeoenvironment Laboratory (PLUS)

Identifiers

Local EPrints ID: 405023
URI: http://eprints.soton.ac.uk/id/eprint/405023
ISSN: 1871-1014
PURE UUID: ec429f96-827f-446e-b799-c1d19cb9416e
ORCID for Anna Bourne: ORCID iD orcid.org/0000-0003-1506-6160

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Date deposited: 26 Jan 2017 10:14
Last modified: 16 Dec 2019 19:29

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