A geochemical approach to glacial sediment provenance in Northern Ireland

Michael Dempster, P Dunlop, Mark Cooper

Research output: Contribution to conferenceAbstract

Abstract

Reconstruction of flow patterns for the Irish Ice Sheet has traditionally relied heavily on the interpretation of subglacial bedforms, namely ribbed moraines and drumlins. Recent research has demonstrated the interpretation of these landforms may at times be misleading, particularly over small sample areas. Furthermore not all areas of glaciated terrain experienced or retain evidence of a
bedforming event. An alternative approach independent of bedform presence is to use geochemistry to establish glacial sediment provenance and hence ice flow direction. This project has used geochemistry of soil developed on till to investigate glacial sediment provenance in Northern Ireland. Principal Component Analysis has been applied to the Tellus Survey soil geochemical database for samples taken on areas of till superficial geology in the region. This approach
allows identification of groups of chemical elements that can be linked to likely parent bedrock material for the till. The regional results show glacial transport and that the majority of till deposits in Northern Ireland are closely related to local bedrock, with rapid geochemical changes at lithological boundaries. This suggests till transport rates in this sector of the Irish Ice Sheet were low, with rapid entrainment and low evacuation rates of debris to the ice margin.

Conference

ConferenceIrish Quaternary Association
Abbreviated titleIQUA
CountryUnited Kingdom
CityBelfast
Period14/04/1214/04/12

Fingerprint

bedform
glacial deposit
provenance
ice sheet
bedrock
geochemistry
glacial transport
drumlin
ice margin
soil survey
ice flow
chemical element
flow pattern
entrainment
landform
principal component analysis
geology
soil
rate
material

Keywords

  • Geochemistry
  • Tellus

Cite this

Dempster, M., Dunlop, P., & Cooper, M. (2012). A geochemical approach to glacial sediment provenance in Northern Ireland. Abstract from Irish Quaternary Association, Belfast, United Kingdom.
Dempster, Michael ; Dunlop, P ; Cooper, Mark. / A geochemical approach to glacial sediment provenance in Northern Ireland. Abstract from Irish Quaternary Association, Belfast, United Kingdom.
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title = "A geochemical approach to glacial sediment provenance in Northern Ireland",
abstract = "Reconstruction of flow patterns for the Irish Ice Sheet has traditionally relied heavily on the interpretation of subglacial bedforms, namely ribbed moraines and drumlins. Recent research has demonstrated the interpretation of these landforms may at times be misleading, particularly over small sample areas. Furthermore not all areas of glaciated terrain experienced or retain evidence of abedforming event. An alternative approach independent of bedform presence is to use geochemistry to establish glacial sediment provenance and hence ice flow direction. This project has used geochemistry of soil developed on till to investigate glacial sediment provenance in Northern Ireland. Principal Component Analysis has been applied to the Tellus Survey soil geochemical database for samples taken on areas of till superficial geology in the region. This approachallows identification of groups of chemical elements that can be linked to likely parent bedrock material for the till. The regional results show glacial transport and that the majority of till deposits in Northern Ireland are closely related to local bedrock, with rapid geochemical changes at lithological boundaries. This suggests till transport rates in this sector of the Irish Ice Sheet were low, with rapid entrainment and low evacuation rates of debris to the ice margin.",
keywords = "Geochemistry, Tellus",
author = "Michael Dempster and P Dunlop and Mark Cooper",
note = "talk; Irish Quaternary Association : Spring Meeting, IQUA ; Conference date: 14-04-2012 Through 14-04-2012",
year = "2012",
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day = "14",
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Dempster, M, Dunlop, P & Cooper, M 2012, 'A geochemical approach to glacial sediment provenance in Northern Ireland' Irish Quaternary Association, Belfast, United Kingdom, 14/04/12 - 14/04/12, .

A geochemical approach to glacial sediment provenance in Northern Ireland. / Dempster, Michael; Dunlop, P; Cooper, Mark.

2012. Abstract from Irish Quaternary Association, Belfast, United Kingdom.

Research output: Contribution to conferenceAbstract

TY - CONF

T1 - A geochemical approach to glacial sediment provenance in Northern Ireland

AU - Dempster, Michael

AU - Dunlop, P

AU - Cooper, Mark

N1 - talk

PY - 2012/4/14

Y1 - 2012/4/14

N2 - Reconstruction of flow patterns for the Irish Ice Sheet has traditionally relied heavily on the interpretation of subglacial bedforms, namely ribbed moraines and drumlins. Recent research has demonstrated the interpretation of these landforms may at times be misleading, particularly over small sample areas. Furthermore not all areas of glaciated terrain experienced or retain evidence of abedforming event. An alternative approach independent of bedform presence is to use geochemistry to establish glacial sediment provenance and hence ice flow direction. This project has used geochemistry of soil developed on till to investigate glacial sediment provenance in Northern Ireland. Principal Component Analysis has been applied to the Tellus Survey soil geochemical database for samples taken on areas of till superficial geology in the region. This approachallows identification of groups of chemical elements that can be linked to likely parent bedrock material for the till. The regional results show glacial transport and that the majority of till deposits in Northern Ireland are closely related to local bedrock, with rapid geochemical changes at lithological boundaries. This suggests till transport rates in this sector of the Irish Ice Sheet were low, with rapid entrainment and low evacuation rates of debris to the ice margin.

AB - Reconstruction of flow patterns for the Irish Ice Sheet has traditionally relied heavily on the interpretation of subglacial bedforms, namely ribbed moraines and drumlins. Recent research has demonstrated the interpretation of these landforms may at times be misleading, particularly over small sample areas. Furthermore not all areas of glaciated terrain experienced or retain evidence of abedforming event. An alternative approach independent of bedform presence is to use geochemistry to establish glacial sediment provenance and hence ice flow direction. This project has used geochemistry of soil developed on till to investigate glacial sediment provenance in Northern Ireland. Principal Component Analysis has been applied to the Tellus Survey soil geochemical database for samples taken on areas of till superficial geology in the region. This approachallows identification of groups of chemical elements that can be linked to likely parent bedrock material for the till. The regional results show glacial transport and that the majority of till deposits in Northern Ireland are closely related to local bedrock, with rapid geochemical changes at lithological boundaries. This suggests till transport rates in this sector of the Irish Ice Sheet were low, with rapid entrainment and low evacuation rates of debris to the ice margin.

KW - Geochemistry

KW - Tellus

M3 - Abstract

ER -

Dempster M, Dunlop P, Cooper M. A geochemical approach to glacial sediment provenance in Northern Ireland. 2012. Abstract from Irish Quaternary Association, Belfast, United Kingdom.