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Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics

Srikumar Roy, View ORCID ProfileAggeliki Georgiopoulou, View ORCID ProfileSara Benetti and Fabio Sacchetti
Geological Society, London, Special Publications, 500, 567-586, 18 March 2020, https://doi.org/10.1144/SP500-2019-177
Srikumar Roy
1iCRAG, School of Earth Sciences, University College Dublin, Dublin D04 N2E5, Ireland
Roles: [Conceptualization (Equal)], [Data curation (Lead)], [Formal analysis (Lead)], [Investigation (Equal)], [Methodology (Lead)], [Project administration (Lead)], [Visualization (Lead)], [Writing - Original Draft (Lead)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
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  • For correspondence: Srikumar.roy@icrag-centre.org
Aggeliki Georgiopoulou
2School of Environment and Technology, University of Brighton, Cockcroft Building, Lewes Road, Brighton BN2 4GJ, UK
Roles: [Conceptualization (Equal)], [Formal analysis (Supporting)], [Investigation (Equal)], [Methodology (Supporting)], [Supervision (Equal)], [Validation (Supporting)], [Visualization (Supporting)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
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  • ORCID record for Aggeliki Georgiopoulou
Sara Benetti
3School of Geography and Environmental Science, Ulster University, Cromore Road, Coleraine, BT52 1SA Northern Ireland, UK
Roles: [Conceptualization (Equal)], [Formal analysis (Supporting)], [Supervision (Equal)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Search for this author on this site
  • ORCID record for Sara Benetti
Fabio Sacchetti
4Marine Institute, Oranmore, Galway H91 R673, Ireland
Roles: [Supervision (Supporting)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Search for this author on this site
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Abstract

This study analyses seismic data to investigate the kinematic indicators within the mass transport deposits (MTDs) of the Donegal Barra Fan complex in the Rockall Trough, along the NW European continental margin. Five episodes of mega-scale MTDs (DBF-01, -02, -03, -04 and -05) are identified. DBF-01 is the largest MTD in the NW British continental margin, comprising 1907 km3 of sediments. Fold-and-thrusts were identified within the MTDs where they attain maximum thickness of c. 300–380 ms TWT, but not at the toe region. This indicates that local erosion and deceleration caused bulking up of the MTD volume, but the MTD was not fully arrested due to the high mobility of the mass flow. MTD thickness distribution and thrust fault orientations indicate source areas and flow direction of MTD. The MTDs show a compensational stacking pattern with earlier deposits influencing the position and flow direction of succeeding slides, suggesting that glaciogenic debris flows are sensitive to topographic variability. We propose that increased sediment input associated with at least five expansions of the British–Irish Ice Sheet to the shelf edge led to the development of these MTDs and that the youngest of them, DBF-05, corresponds to the Last Glacial Maximum.

  • © 2020 The Author(s). Published by The Geological Society of London. All rights reserved
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Geological Society, London, Special Publications: 500 (1)
Geological Society, London, Special Publications
Volume 500
2020
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Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics

Srikumar Roy, Aggeliki Georgiopoulou, Sara Benetti and Fabio Sacchetti
Geological Society, London, Special Publications, 500, 567-586, 18 March 2020, https://doi.org/10.1144/SP500-2019-177
Srikumar Roy
1iCRAG, School of Earth Sciences, University College Dublin, Dublin D04 N2E5, Ireland
Roles: [Conceptualization (Equal)], [Data curation (Lead)], [Formal analysis (Lead)], [Investigation (Equal)], [Methodology (Lead)], [Project administration (Lead)], [Visualization (Lead)], [Writing - Original Draft (Lead)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: Srikumar.roy@icrag-centre.org
Aggeliki Georgiopoulou
2School of Environment and Technology, University of Brighton, Cockcroft Building, Lewes Road, Brighton BN2 4GJ, UK
Roles: [Conceptualization (Equal)], [Formal analysis (Supporting)], [Investigation (Equal)], [Methodology (Supporting)], [Supervision (Equal)], [Validation (Supporting)], [Visualization (Supporting)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Aggeliki Georgiopoulou
Sara Benetti
3School of Geography and Environmental Science, Ulster University, Cromore Road, Coleraine, BT52 1SA Northern Ireland, UK
Roles: [Conceptualization (Equal)], [Formal analysis (Supporting)], [Supervision (Equal)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Sara Benetti
Fabio Sacchetti
4Marine Institute, Oranmore, Galway H91 R673, Ireland
Roles: [Supervision (Supporting)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics

Srikumar Roy, Aggeliki Georgiopoulou, Sara Benetti and Fabio Sacchetti
Geological Society, London, Special Publications, 500, 567-586, 18 March 2020, https://doi.org/10.1144/SP500-2019-177
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