Sedimentology and chronology of the advance and retreat of the last British-Irish Ice Sheet on the continental shelf west of Ireland
The last British-Irish Ice Sheet (BIIS) had extensive marine-terminating margins and was drained by multiple large ice streams and is thus a useful analogue for marine-based areas of modern ice sheets. However, despite recent advances from investigating the offshore record of the BIIS, the dynamic h...
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ftleedsuniv:oai:eprints.whiterose.ac.uk:102848 2023-05-15T16:40:46+02:00 Sedimentology and chronology of the advance and retreat of the last British-Irish Ice Sheet on the continental shelf west of Ireland Peters, J.L. Benetti, S. Dunlop, P. Ó Cofaigh, C. Moreton, S.G. Wheeler, A.J. Clark, C.D. 2016-05-15 text https://eprints.whiterose.ac.uk/102848/ https://eprints.whiterose.ac.uk/102848/7/Sedimentology_and_chronology_of__the_last_British_Irish_Ice_Sheet_on_the_continental_shelf_west_of_Ireland_-_QSR_2016%20%281%29.pdf https://doi.org/10.1016/j.quascirev.2016.03.012 en eng Elsevier https://eprints.whiterose.ac.uk/102848/7/Sedimentology_and_chronology_of__the_last_British_Irish_Ice_Sheet_on_the_continental_shelf_west_of_Ireland_-_QSR_2016%20%281%29.pdf Peters, J.L., Benetti, S., Dunlop, P. et al. (4 more authors) (2016) Sedimentology and chronology of the advance and retreat of the last British-Irish Ice Sheet on the continental shelf west of Ireland. Quaternary Science Reviews, 140. C. pp. 101-124. ISSN 0277-3791 cc_by_nc_nd_4 CC-BY-NC-ND Article NonPeerReviewed 2016 ftleedsuniv https://doi.org/10.1016/j.quascirev.2016.03.012 2023-01-30T21:44:44Z The last British-Irish Ice Sheet (BIIS) had extensive marine-terminating margins and was drained by multiple large ice streams and is thus a useful analogue for marine-based areas of modern ice sheets. However, despite recent advances from investigating the offshore record of the BIIS, the dynamic history of its marine margins, which would have been sensitive to external forcing(s), remain inadequately understood. This study is the first reconstruction of the retreat dynamics and chronology of the western, marine-terminating, margin of the last (Late Midlandian) BIIS. Analyses of shelf geomorphology and core sedimentology and chronology enable a reconstruction of the Late Midlandian history of the BIIS west of Ireland, from initial advance to final retreat onshore. Five AMS radiocarbon dates from marine cores constrain the timing of retreat and associated readvances during deglaciation. The BIIS advanced without streaming or surging, depositing a bed of highly consolidated subglacial traction till, and reached to within ~20 km of the shelf break by ~24,000 Cal BP. Ice margin retreat was likely preceded by thinning, grounding zone retreat and ice shelf formation on the outer shelf by ~22,000 Cal BP. This ice shelf persisted for �2500 years, while retreating at a minimum rate of ~24 m/yr and buttressing a >150-km long, 20-km wide, bathymetrically-controlled grounding zone. A large (~150 km long), arcuate, flattopped grounding-zone wedge, termed here the Galway Lobe Grounding-Zone Wedge (GLGZW), was deposited below this ice shelf and records a significant stillstand in BIIS retreat. Geomorphic relationships indicate that the BIIS experienced continued thinning during its retreat across the shelf, which led to increased topographic influence on its flow dynamics following ice shelf break up and grounding zone retreat past the GLGZW. At this stage of retreat the western BIIS was comprised of several discrete, asynchronous lobes that underwent several readvances. Sedimentary evidence of dilatant till deposition ... Article in Journal/Newspaper Ice Sheet Ice Shelf White Rose Research Online (Universities of Leeds, Sheffield & York) Quaternary Science Reviews 140 101 124 |
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Open Polar |
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White Rose Research Online (Universities of Leeds, Sheffield & York) |
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ftleedsuniv |
language |
English |
description |
The last British-Irish Ice Sheet (BIIS) had extensive marine-terminating margins and was drained by multiple large ice streams and is thus a useful analogue for marine-based areas of modern ice sheets. However, despite recent advances from investigating the offshore record of the BIIS, the dynamic history of its marine margins, which would have been sensitive to external forcing(s), remain inadequately understood. This study is the first reconstruction of the retreat dynamics and chronology of the western, marine-terminating, margin of the last (Late Midlandian) BIIS. Analyses of shelf geomorphology and core sedimentology and chronology enable a reconstruction of the Late Midlandian history of the BIIS west of Ireland, from initial advance to final retreat onshore. Five AMS radiocarbon dates from marine cores constrain the timing of retreat and associated readvances during deglaciation. The BIIS advanced without streaming or surging, depositing a bed of highly consolidated subglacial traction till, and reached to within ~20 km of the shelf break by ~24,000 Cal BP. Ice margin retreat was likely preceded by thinning, grounding zone retreat and ice shelf formation on the outer shelf by ~22,000 Cal BP. This ice shelf persisted for �2500 years, while retreating at a minimum rate of ~24 m/yr and buttressing a >150-km long, 20-km wide, bathymetrically-controlled grounding zone. A large (~150 km long), arcuate, flattopped grounding-zone wedge, termed here the Galway Lobe Grounding-Zone Wedge (GLGZW), was deposited below this ice shelf and records a significant stillstand in BIIS retreat. Geomorphic relationships indicate that the BIIS experienced continued thinning during its retreat across the shelf, which led to increased topographic influence on its flow dynamics following ice shelf break up and grounding zone retreat past the GLGZW. At this stage of retreat the western BIIS was comprised of several discrete, asynchronous lobes that underwent several readvances. Sedimentary evidence of dilatant till deposition ... |
format |
Article in Journal/Newspaper |
author |
Peters, J.L. Benetti, S. Dunlop, P. Ó Cofaigh, C. Moreton, S.G. Wheeler, A.J. Clark, C.D. |
spellingShingle |
Peters, J.L. Benetti, S. Dunlop, P. Ó Cofaigh, C. Moreton, S.G. Wheeler, A.J. Clark, C.D. Sedimentology and chronology of the advance and retreat of the last British-Irish Ice Sheet on the continental shelf west of Ireland |
author_facet |
Peters, J.L. Benetti, S. Dunlop, P. Ó Cofaigh, C. Moreton, S.G. Wheeler, A.J. Clark, C.D. |
author_sort |
Peters, J.L. |
title |
Sedimentology and chronology of the advance and retreat of the last British-Irish Ice Sheet on the continental shelf west of Ireland |
title_short |
Sedimentology and chronology of the advance and retreat of the last British-Irish Ice Sheet on the continental shelf west of Ireland |
title_full |
Sedimentology and chronology of the advance and retreat of the last British-Irish Ice Sheet on the continental shelf west of Ireland |
title_fullStr |
Sedimentology and chronology of the advance and retreat of the last British-Irish Ice Sheet on the continental shelf west of Ireland |
title_full_unstemmed |
Sedimentology and chronology of the advance and retreat of the last British-Irish Ice Sheet on the continental shelf west of Ireland |
title_sort |
sedimentology and chronology of the advance and retreat of the last british-irish ice sheet on the continental shelf west of ireland |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://eprints.whiterose.ac.uk/102848/ https://eprints.whiterose.ac.uk/102848/7/Sedimentology_and_chronology_of__the_last_British_Irish_Ice_Sheet_on_the_continental_shelf_west_of_Ireland_-_QSR_2016%20%281%29.pdf https://doi.org/10.1016/j.quascirev.2016.03.012 |
genre |
Ice Sheet Ice Shelf |
genre_facet |
Ice Sheet Ice Shelf |
op_relation |
https://eprints.whiterose.ac.uk/102848/7/Sedimentology_and_chronology_of__the_last_British_Irish_Ice_Sheet_on_the_continental_shelf_west_of_Ireland_-_QSR_2016%20%281%29.pdf Peters, J.L., Benetti, S., Dunlop, P. et al. (4 more authors) (2016) Sedimentology and chronology of the advance and retreat of the last British-Irish Ice Sheet on the continental shelf west of Ireland. Quaternary Science Reviews, 140. C. pp. 101-124. ISSN 0277-3791 |
op_rights |
cc_by_nc_nd_4 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.quascirev.2016.03.012 |
container_title |
Quaternary Science Reviews |
container_volume |
140 |
container_start_page |
101 |
op_container_end_page |
124 |
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1766031182140538880 |