Tracking Late Quaternary ice sheet dynamics by multi-proxy detrital mineral U-Pb analysis: A case study from the Odyssea contourite, Ross Sea, Antarctica.
L ate Quaternary Antarctic ice-sheet instability is recorded by ice-rafted debris (IRD) in mid- to highlatitude marine sediment, especially during marine isotope stages (MIS) 2-3, but drivers of this instability remain enigmatic (Labeyrie et al., 1986). A key step in resolving this puzzle is to dete...
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ftunivpisairis:oai:arpi.unipi.it:11568/1039548 2024-04-14T08:02:30+00:00 Tracking Late Quaternary ice sheet dynamics by multi-proxy detrital mineral U-Pb analysis: A case study from the Odyssea contourite, Ross Sea, Antarctica. Neofitu R. Mark C. Rebesco M. Lucchi R. G. Douss N. Morigi C. Kelley S. Daly J. S. Neofitu, R. Mark, C. Rebesco, M. Lucchi, R. G. Douss, N. Morigi, C. Kelley, S. Daly, J. S. 2020 ELETTRONICO https://hdl.handle.net/11568/1039548 https://doi.org/10.5194/egusphere-egu2020-5011 https://meetingorganizer.copernicus.org/EGU2020/EGU2020-5011.html eng eng volume:EGU2020-5011 numberofpages:1 journal:GEOPHYSICAL RESEARCH ABSTRACTS https://hdl.handle.net/11568/1039548 doi:10.5194/egusphere-egu2020-5011 https://meetingorganizer.copernicus.org/EGU2020/EGU2020-5011.html info:eu-repo/semantics/article 2020 ftunivpisairis https://doi.org/10.5194/egusphere-egu2020-5011 2024-03-21T19:15:37Z L ate Quaternary Antarctic ice-sheet instability is recorded by ice-rafted debris (IRD) in mid- to highlatitude marine sediment, especially during marine isotope stages (MIS) 2-3, but drivers of this instability remain enigmatic (Labeyrie et al., 1986). A key step in resolving this puzzle is to determine the location of iceberg calving sites, thus highlighting ice sheet sectors exhibiting repeated instability. Single-grain U-Pb provenance analysis applied to clastic IRD provides a suitable high-resolution tool for this task, and also permits discrimination of continental IRD from volcanic material. The application of multiple proxies (apatite, rutile, and zircon) is critical in order to reduce source area fertility biases: for example, the near exclusive occurrence of zircon in felsicintermediate igneous rocks (e.g., Hietpas et al., 2010). Here, we present detrital apatite, zircon, and rutile U-Pb data from samples taken from a gravity core from the Odyssea contourite drift system, located on the margin of the Ross Sea (Rebesco et al., 2018) and deposited during MIS2-3. Contourites are marine clastic sediment deposits forming by along-slope, bottom currents reworking of fine-grained (clay-silt) sediments delivered by downslope sedimentary processes (e.g. meltwaters, turbidity currents, debris flows). Crucially, contourite targetting eliminates the challenge of distinguishing IRD from coarse (sand-gravel) turbidite material in basin deposits, as ice-sheet instability is also associated with turbidite production at glaciated shelf margins (e.g., Bart et al., 1999). We couple our analysis with the multi-proxy sediment analyses previously performed by Lucchi et al. (2019). We consider the implications of our data for the advance and retreat of the Antarctic Ice Sheet during MIS 2-3, and discuss the further applicability of our multi-proxy approach around Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Iceberg* Ross Sea ARPI - Archivio della Ricerca dell'Università di Pisa Antarctic Ross Sea The Antarctic |
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Open Polar |
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ARPI - Archivio della Ricerca dell'Università di Pisa |
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ftunivpisairis |
language |
English |
description |
L ate Quaternary Antarctic ice-sheet instability is recorded by ice-rafted debris (IRD) in mid- to highlatitude marine sediment, especially during marine isotope stages (MIS) 2-3, but drivers of this instability remain enigmatic (Labeyrie et al., 1986). A key step in resolving this puzzle is to determine the location of iceberg calving sites, thus highlighting ice sheet sectors exhibiting repeated instability. Single-grain U-Pb provenance analysis applied to clastic IRD provides a suitable high-resolution tool for this task, and also permits discrimination of continental IRD from volcanic material. The application of multiple proxies (apatite, rutile, and zircon) is critical in order to reduce source area fertility biases: for example, the near exclusive occurrence of zircon in felsicintermediate igneous rocks (e.g., Hietpas et al., 2010). Here, we present detrital apatite, zircon, and rutile U-Pb data from samples taken from a gravity core from the Odyssea contourite drift system, located on the margin of the Ross Sea (Rebesco et al., 2018) and deposited during MIS2-3. Contourites are marine clastic sediment deposits forming by along-slope, bottom currents reworking of fine-grained (clay-silt) sediments delivered by downslope sedimentary processes (e.g. meltwaters, turbidity currents, debris flows). Crucially, contourite targetting eliminates the challenge of distinguishing IRD from coarse (sand-gravel) turbidite material in basin deposits, as ice-sheet instability is also associated with turbidite production at glaciated shelf margins (e.g., Bart et al., 1999). We couple our analysis with the multi-proxy sediment analyses previously performed by Lucchi et al. (2019). We consider the implications of our data for the advance and retreat of the Antarctic Ice Sheet during MIS 2-3, and discuss the further applicability of our multi-proxy approach around Antarctica. |
author2 |
Neofitu, R. Mark, C. Rebesco, M. Lucchi, R. G. Douss, N. Morigi, C. Kelley, S. Daly, J. S. |
format |
Article in Journal/Newspaper |
author |
Neofitu R. Mark C. Rebesco M. Lucchi R. G. Douss N. Morigi C. Kelley S. Daly J. S. |
spellingShingle |
Neofitu R. Mark C. Rebesco M. Lucchi R. G. Douss N. Morigi C. Kelley S. Daly J. S. Tracking Late Quaternary ice sheet dynamics by multi-proxy detrital mineral U-Pb analysis: A case study from the Odyssea contourite, Ross Sea, Antarctica. |
author_facet |
Neofitu R. Mark C. Rebesco M. Lucchi R. G. Douss N. Morigi C. Kelley S. Daly J. S. |
author_sort |
Neofitu R. |
title |
Tracking Late Quaternary ice sheet dynamics by multi-proxy detrital mineral U-Pb analysis: A case study from the Odyssea contourite, Ross Sea, Antarctica. |
title_short |
Tracking Late Quaternary ice sheet dynamics by multi-proxy detrital mineral U-Pb analysis: A case study from the Odyssea contourite, Ross Sea, Antarctica. |
title_full |
Tracking Late Quaternary ice sheet dynamics by multi-proxy detrital mineral U-Pb analysis: A case study from the Odyssea contourite, Ross Sea, Antarctica. |
title_fullStr |
Tracking Late Quaternary ice sheet dynamics by multi-proxy detrital mineral U-Pb analysis: A case study from the Odyssea contourite, Ross Sea, Antarctica. |
title_full_unstemmed |
Tracking Late Quaternary ice sheet dynamics by multi-proxy detrital mineral U-Pb analysis: A case study from the Odyssea contourite, Ross Sea, Antarctica. |
title_sort |
tracking late quaternary ice sheet dynamics by multi-proxy detrital mineral u-pb analysis: a case study from the odyssea contourite, ross sea, antarctica. |
publishDate |
2020 |
url |
https://hdl.handle.net/11568/1039548 https://doi.org/10.5194/egusphere-egu2020-5011 https://meetingorganizer.copernicus.org/EGU2020/EGU2020-5011.html |
geographic |
Antarctic Ross Sea The Antarctic |
geographic_facet |
Antarctic Ross Sea The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Iceberg* Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Iceberg* Ross Sea |
op_relation |
volume:EGU2020-5011 numberofpages:1 journal:GEOPHYSICAL RESEARCH ABSTRACTS https://hdl.handle.net/11568/1039548 doi:10.5194/egusphere-egu2020-5011 https://meetingorganizer.copernicus.org/EGU2020/EGU2020-5011.html |
op_doi |
https://doi.org/10.5194/egusphere-egu2020-5011 |
_version_ |
1796315415546167296 |