Oscillating retreat of the last British-Irish Ice Sheet on the continental shelf offshore Galway Bay, western Ireland.

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

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Oscillating retreat of the last British-Irish Ice Sheet on the continental shelf offshore Galway Bay, western Ireland. / Callard, Sarah Louise; O'Cofaigh, Colm; Benetti, Sara et al.
Yn: Marine Geology, Cyfrol 420, 106087, 02.2020.

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

HarvardHarvard

Callard, SL, O'Cofaigh, C, Benetti, S, Chiverrell, R, Van Landeghem, K, Saher, M, Livingstone, SJ, Clark, C, Small, D, Fabel, D & Moreton, S 2020, 'Oscillating retreat of the last British-Irish Ice Sheet on the continental shelf offshore Galway Bay, western Ireland.', Marine Geology, cyfrol. 420, 106087. https://doi.org/10.1016/j.margeo.2019.106087

APA

Callard, S. L., O'Cofaigh, C., Benetti, S., Chiverrell, R., Van Landeghem, K., Saher, M., Livingstone, S. J., Clark, C., Small, D., Fabel, D., & Moreton, S. (2020). Oscillating retreat of the last British-Irish Ice Sheet on the continental shelf offshore Galway Bay, western Ireland. Marine Geology, 420, Erthygl 106087. https://doi.org/10.1016/j.margeo.2019.106087

CBE

Callard SL, O'Cofaigh C, Benetti S, Chiverrell R, Van Landeghem K, Saher M, Livingstone SJ, Clark C, Small D, Fabel D, et al. 2020. Oscillating retreat of the last British-Irish Ice Sheet on the continental shelf offshore Galway Bay, western Ireland. Marine Geology. 420:Article 106087. https://doi.org/10.1016/j.margeo.2019.106087

MLA

VancouverVancouver

Callard SL, O'Cofaigh C, Benetti S, Chiverrell R, Van Landeghem K, Saher M et al. Oscillating retreat of the last British-Irish Ice Sheet on the continental shelf offshore Galway Bay, western Ireland. Marine Geology. 2020 Chw;420:106087. Epub 2019 Tach 26. doi: 10.1016/j.margeo.2019.106087

Author

Callard, Sarah Louise ; O'Cofaigh, Colm ; Benetti, Sara et al. / Oscillating retreat of the last British-Irish Ice Sheet on the continental shelf offshore Galway Bay, western Ireland. Yn: Marine Geology. 2020 ; Cyfrol 420.

RIS

TY - JOUR

T1 - Oscillating retreat of the last British-Irish Ice Sheet on the continental shelf offshore Galway Bay, western Ireland.

AU - Callard, Sarah Louise

AU - O'Cofaigh, Colm

AU - Benetti, Sara

AU - Chiverrell, Richard

AU - Van Landeghem, Katrien

AU - Saher, Margot

AU - Livingstone, S.J.

AU - Clark, Chris

AU - Small, David

AU - Fabel, Derek

AU - Moreton, Steven

PY - 2020/2

Y1 - 2020/2

N2 - During the Last Glacial Maximum, the British-Irish Ice Sheet extended across the continental shelf offshore of Galway Bay, western Ireland, and reached a maximum westward extent on the Porcupine Bank. New marine geophysical data, sediment cores and radiocarbon dates are used to constrain the style and timing of ice-sheet retreat across the mid to inner-shelf. Radiocarbon dated shell fragments in subglacial till on the mid-shelf constrains ice advance to after 26.4 ka BP. Initial retreat was underway before 24.4 ka BP, significantly earlier than previous reconstructions. Grounding-line retreat was accompanied by stillstands and/or localised readvances of the grounding -line. A large composite Mid-Shelf Grounding Zone Complex marks a major grounding-line position, with the ice grounded and the margin oscillating at this position by, and probably after, 23 ka BP. The continental shelf was ice-free by 17.1 cal. ka BP, but the ice sheet may have retained a marine margin until c. 15.3 ka BP. Retreat occurred in a glacimarine setting and the ice sheet was fringed by a floating ice-shelf.Collectively, this evidence indicates a dynamic and oscillatory marine-terminating ice sheet offshore of western Ireland during the last deglaciation.

AB - During the Last Glacial Maximum, the British-Irish Ice Sheet extended across the continental shelf offshore of Galway Bay, western Ireland, and reached a maximum westward extent on the Porcupine Bank. New marine geophysical data, sediment cores and radiocarbon dates are used to constrain the style and timing of ice-sheet retreat across the mid to inner-shelf. Radiocarbon dated shell fragments in subglacial till on the mid-shelf constrains ice advance to after 26.4 ka BP. Initial retreat was underway before 24.4 ka BP, significantly earlier than previous reconstructions. Grounding-line retreat was accompanied by stillstands and/or localised readvances of the grounding -line. A large composite Mid-Shelf Grounding Zone Complex marks a major grounding-line position, with the ice grounded and the margin oscillating at this position by, and probably after, 23 ka BP. The continental shelf was ice-free by 17.1 cal. ka BP, but the ice sheet may have retained a marine margin until c. 15.3 ka BP. Retreat occurred in a glacimarine setting and the ice sheet was fringed by a floating ice-shelf.Collectively, this evidence indicates a dynamic and oscillatory marine-terminating ice sheet offshore of western Ireland during the last deglaciation.

KW - Grounding Zone Wedges

KW - British -Irish Ice Sheet

KW - Ice Shelf

KW - Glacimarine

KW - Last Glacial Maximum

KW - Ice -Sheet Retreat

KW - Continental Shelf

U2 - 10.1016/j.margeo.2019.106087

DO - 10.1016/j.margeo.2019.106087

M3 - Article

VL - 420

JO - Marine Geology

JF - Marine Geology

SN - 0025-3227

M1 - 106087

ER -