Final deglaciation of the Malin Sea through meltwater release and calving events.
During the last glacial maximum, the British–Irish Ice Sheet (BIIS) extended to the shelf edge in the Malin Sea between Ireland and Scotland, delivering sediments to the Donegal Barra Fan (DBF). Analysis of well-preserved, glacially derived sediment in the DBF provides new insights on the character...
Published in: | Scottish Journal of Geology |
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Geological Society
2020
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Online Access: | http://dro.dur.ac.uk/30802/ http://dro.dur.ac.uk/30802/1/30802.pdf https://doi.org/10.1144/sjg2019-010 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:30802 2023-05-15T16:40:32+02:00 Final deglaciation of the Malin Sea through meltwater release and calving events. Tarlati, S. Benetti, S. Callard, S.L. Ó Cofaigh, C. Dunlop, P. Georgiopoulou, A. Edwards, R. Van Landeghem, K. Saher, M. Chiverrell, R. Fabel, D. Moreton, S. Morgan, S. Clark, C.D. 2020-01-01 application/pdf http://dro.dur.ac.uk/30802/ http://dro.dur.ac.uk/30802/1/30802.pdf https://doi.org/10.1144/sjg2019-010 unknown Geological Society dro:30802 issn:0036-9276 issn: 2041-4951 doi:10.1144/sjg2019-010 http://dro.dur.ac.uk/30802/ https://doi.org/10.1144/sjg2019-010 http://dro.dur.ac.uk/30802/1/30802.pdf Scottish journal of geology 2020. https://doi.org/10.1144/sjg2019-010. © Geological Society of London 2020. Scottish journal of geology, 2020, Vol.56(2), pp.117-133 [Peer Reviewed Journal] Article PeerReviewed 2020 ftunivdurham https://doi.org/10.1144/sjg2019-010 2021-09-30T22:23:08Z During the last glacial maximum, the British–Irish Ice Sheet (BIIS) extended to the shelf edge in the Malin Sea between Ireland and Scotland, delivering sediments to the Donegal Barra Fan (DBF). Analysis of well-preserved, glacially derived sediment in the DBF provides new insights on the character of the BIIS final deglaciation and palaeoenvironmental conditions at the Younger Dryas. Chaotic/laminated muds, ice-rafted debris (IRD)-rich layers and laminated sand–mud couplets are interpreted as respectively mass transport deposits, plumites and turbidites of BIIS-transported sediments. Peaks in IRD, constrained by radiocarbon dating to after 18 cal ka BP, indicate discrete intervals of iceberg calving during the last stages of deglaciation. Glacially derived sedimentation on the slope occurred until c. 16.9 cal ka BP. This is interpreted as the last time the ice sheet was present on to the shelf, allowing glacial meltwater to reach the fan. Bioturbated and foraminifera-rich muds above glaciomarine sediments are interpreted as interglacial hemipelagites and contourites, with the presence of Zoophycos suggesting restoration of bottom currents at the transition between stadial and interstadial conditions. During the Younger Dryas, Neogloboquadrina pachyderma sinistral abundances and an isolated peak in IRD indicate the temporary restoration of cold conditions and the presence of icebergs in the region. Article in Journal/Newspaper Ice Sheet Neogloboquadrina pachyderma Durham University: Durham Research Online Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) Scottish Journal of Geology 56 2 117 133 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
During the last glacial maximum, the British–Irish Ice Sheet (BIIS) extended to the shelf edge in the Malin Sea between Ireland and Scotland, delivering sediments to the Donegal Barra Fan (DBF). Analysis of well-preserved, glacially derived sediment in the DBF provides new insights on the character of the BIIS final deglaciation and palaeoenvironmental conditions at the Younger Dryas. Chaotic/laminated muds, ice-rafted debris (IRD)-rich layers and laminated sand–mud couplets are interpreted as respectively mass transport deposits, plumites and turbidites of BIIS-transported sediments. Peaks in IRD, constrained by radiocarbon dating to after 18 cal ka BP, indicate discrete intervals of iceberg calving during the last stages of deglaciation. Glacially derived sedimentation on the slope occurred until c. 16.9 cal ka BP. This is interpreted as the last time the ice sheet was present on to the shelf, allowing glacial meltwater to reach the fan. Bioturbated and foraminifera-rich muds above glaciomarine sediments are interpreted as interglacial hemipelagites and contourites, with the presence of Zoophycos suggesting restoration of bottom currents at the transition between stadial and interstadial conditions. During the Younger Dryas, Neogloboquadrina pachyderma sinistral abundances and an isolated peak in IRD indicate the temporary restoration of cold conditions and the presence of icebergs in the region. |
format |
Article in Journal/Newspaper |
author |
Tarlati, S. Benetti, S. Callard, S.L. Ó Cofaigh, C. Dunlop, P. Georgiopoulou, A. Edwards, R. Van Landeghem, K. Saher, M. Chiverrell, R. Fabel, D. Moreton, S. Morgan, S. Clark, C.D. |
spellingShingle |
Tarlati, S. Benetti, S. Callard, S.L. Ó Cofaigh, C. Dunlop, P. Georgiopoulou, A. Edwards, R. Van Landeghem, K. Saher, M. Chiverrell, R. Fabel, D. Moreton, S. Morgan, S. Clark, C.D. Final deglaciation of the Malin Sea through meltwater release and calving events. |
author_facet |
Tarlati, S. Benetti, S. Callard, S.L. Ó Cofaigh, C. Dunlop, P. Georgiopoulou, A. Edwards, R. Van Landeghem, K. Saher, M. Chiverrell, R. Fabel, D. Moreton, S. Morgan, S. Clark, C.D. |
author_sort |
Tarlati, S. |
title |
Final deglaciation of the Malin Sea through meltwater release and calving events. |
title_short |
Final deglaciation of the Malin Sea through meltwater release and calving events. |
title_full |
Final deglaciation of the Malin Sea through meltwater release and calving events. |
title_fullStr |
Final deglaciation of the Malin Sea through meltwater release and calving events. |
title_full_unstemmed |
Final deglaciation of the Malin Sea through meltwater release and calving events. |
title_sort |
final deglaciation of the malin sea through meltwater release and calving events. |
publisher |
Geological Society |
publishDate |
2020 |
url |
http://dro.dur.ac.uk/30802/ http://dro.dur.ac.uk/30802/1/30802.pdf https://doi.org/10.1144/sjg2019-010 |
long_lat |
ENVELOPE(-61.417,-61.417,-64.367,-64.367) |
geographic |
Barra |
geographic_facet |
Barra |
genre |
Ice Sheet Neogloboquadrina pachyderma |
genre_facet |
Ice Sheet Neogloboquadrina pachyderma |
op_source |
Scottish journal of geology, 2020, Vol.56(2), pp.117-133 [Peer Reviewed Journal] |
op_relation |
dro:30802 issn:0036-9276 issn: 2041-4951 doi:10.1144/sjg2019-010 http://dro.dur.ac.uk/30802/ https://doi.org/10.1144/sjg2019-010 http://dro.dur.ac.uk/30802/1/30802.pdf |
op_rights |
Scottish journal of geology 2020. https://doi.org/10.1144/sjg2019-010. © Geological Society of London 2020. |
op_doi |
https://doi.org/10.1144/sjg2019-010 |
container_title |
Scottish Journal of Geology |
container_volume |
56 |
container_issue |
2 |
container_start_page |
117 |
op_container_end_page |
133 |
_version_ |
1766030939605958656 |