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

Srikumar Roy; Aggeliki Georgiopoulou; Sara Benetti; Fabio Sacchetti

doi:10.1144/sp500-2019-177

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

Srikumar Roy, Aggeliki Georgiopoulou, Sara Benetti, Fabio Sacchetti

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

4 Citations (Scopus)

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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.

Original language	English
Title of host publication	Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard Assessments: Advances in Process Understanding, Monitoring and Hazard Assessments
Editors	Aggeliki Georgiopoulou, LA Amy, Sara Benetti, JD Chaytor, MA Clare, D Gamboa, PDW Haughton, J Moernaut, JJ Mountjoy
Publisher	The Geological Society
Pages	567-586
Number of pages	20
Volume	500
Edition	1
DOIs	https://doi.org/10.1144/sp500-2019-177
Publication status	Published online - 18 Mar 2020

Publication series

Name	Geological Society Special Publication
Number	1
Volume	500
ISSN (Print)	0305-8719

Bibliographical note

Funding Information:
This publication derives from research supported in part by a research grant from Science Foundation Ireland (SFI) under Grant Number 13/RC/ 2092 and co-funded under the European Regional Development Fund and by iCRAG industry partners. SR also thanks the Irish Research Council Government of Ireland for the Postdoctoral Fellow Award Project No. GOIPD/2018/17).

Publisher Copyright:
© 2020 The Author(s).

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

Geology
Ocean Engineering
Water Science and Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1144/sp500-2019-177

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Roy, S., Georgiopoulou, A., Benetti, S., & Sacchetti, F. (2020). Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics. In A. Georgiopoulou, LA. Amy, S. Benetti, JD. Chaytor, MA. Clare, D. Gamboa, PDW. Haughton, J. Moernaut, & JJ. Mountjoy (Eds.), Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard Assessments: Advances in Process Understanding, Monitoring and Hazard Assessments (1 ed., Vol. 500, pp. 567-586). (Geological Society Special Publication; Vol. 500, No. 1). The Geological Society. https://doi.org/10.1144/sp500-2019-177

Roy, Srikumar ; Georgiopoulou, Aggeliki ; Benetti, Sara et al. / Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics. Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard Assessments: Advances in Process Understanding, Monitoring and Hazard Assessments. editor / Aggeliki Georgiopoulou ; LA Amy ; Sara Benetti ; JD Chaytor ; MA Clare ; D Gamboa ; PDW Haughton ; J Moernaut ; JJ Mountjoy. Vol. 500 1. ed. The Geological Society, 2020. pp. 567-586 (Geological Society Special Publication; 1).

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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.",

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Roy, S, Georgiopoulou, A, Benetti, S & Sacchetti, F 2020, Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics. in A Georgiopoulou, LA Amy, S Benetti, JD Chaytor, MA Clare, D Gamboa, PDW Haughton, J Moernaut & JJ Mountjoy (eds), Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard Assessments: Advances in Process Understanding, Monitoring and Hazard Assessments. 1 edn, vol. 500, Geological Society Special Publication, no. 1, vol. 500, The Geological Society, pp. 567-586. https://doi.org/10.1144/sp500-2019-177

Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics. / Roy, Srikumar; Georgiopoulou, Aggeliki; Benetti, Sara et al.
Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard Assessments: Advances in Process Understanding, Monitoring and Hazard Assessments. ed. / Aggeliki Georgiopoulou; LA Amy; Sara Benetti; JD Chaytor; MA Clare; D Gamboa; PDW Haughton; J Moernaut; JJ Mountjoy. Vol. 500 1. ed. The Geological Society, 2020. p. 567-586 (Geological Society Special Publication; Vol. 500, No. 1).

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

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N1 - Funding Information: This publication derives from research supported in part by a research grant from Science Foundation Ireland (SFI) under Grant Number 13/RC/ 2092 and co-funded under the European Regional Development Fund and by iCRAG industry partners. SR also thanks the Irish Research Council Government of Ireland for the Postdoctoral Fellow Award Project No. GOIPD/2018/17). Publisher Copyright: © 2020 The Author(s). Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

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N2 - 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.

AB - 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.

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Roy S, Georgiopoulou A, Benetti S, Sacchetti F. Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics. In Georgiopoulou A, Amy LA, Benetti S, Chaytor JD, Clare MA, Gamboa D, Haughton PDW, Moernaut J, Mountjoy JJ, editors, Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard Assessments: Advances in Process Understanding, Monitoring and Hazard Assessments. 1 ed. Vol. 500. The Geological Society. 2020. p. 567-586. (Geological Society Special Publication; 1). Epub 2020 Mar 18. doi: 10.1144/sp500-2019-177

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

Abstract

Publication series

Bibliographical note

Keywords

UN SDGs

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