Iceberg-rafted tephra as a potential tool for the reconstruction of ice-sheet processes and ocean surface circulation in the glacial North Atlantic
Ice-rafted tephra deposits, of Marine Isotope Stage 6 (MIS 6) age, from Site U 1304 on the Gardar Drift, North Atlantic were examined for their shard size distribution and major element composition. The heterogeneous composition, large shard sizes and association with ice-rafted debris (IRD) indicat...
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ftgeosoclonfig:oai:figshare.com:article/3453629 2023-05-15T16:40:26+02:00 Iceberg-rafted tephra as a potential tool for the reconstruction of ice-sheet processes and ocean surface circulation in the glacial North Atlantic Marion Kuhs William E. N. Austin Peter M. Abbott David A. Hodell 2016-06-21T11:34:03Z https://doi.org/10.6084/m9.figshare.3453629.v1 https://figshare.com/articles/Iceberg-rafted_tephra_as_a_potential_tool_for_the_reconstruction_of_ice-sheet_processes_and_ocean_surface_circulation_in_the___glacial_North_Atlantic/3453629 unknown doi:10.6084/m9.figshare.3453629.v1 https://figshare.com/articles/Iceberg-rafted_tephra_as_a_potential_tool_for_the_reconstruction_of_ice-sheet_processes_and_ocean_surface_circulation_in_the___glacial_North_Atlantic/3453629 CC BY 4.0 CC-BY Geology Site U 1304. Comparison Gardar Drift shard size distribution surface ocean circulation models Last Glacial Maximum shard sizes North Atlantic geochemical analysis MIS 6 deposits source regions MIS 6 Icelandic Ice Sheet characterization element composition Site U 1304 North Atlantic IRD Icelandic glass ocean surface circulation flow models IIS Marine Isotope Stage 6 surface ocean circulation patterns shard geochemistry tephra components LGM Text Journal contribution 2016 ftgeosoclonfig https://doi.org/10.6084/m9.figshare.3453629.v1 2020-02-21T07:24:06Z Ice-rafted tephra deposits, of Marine Isotope Stage 6 (MIS 6) age, from Site U 1304 on the Gardar Drift, North Atlantic were examined for their shard size distribution and major element composition. The heterogeneous composition, large shard sizes and association with ice-rafted debris (IRD) indicate that these late MIS 6 deposits were transported by iceberg-rafting from Iceland to Site U 1304. Comparison of individual shard geochemistry with the geochemistry of Holocene volcanic systems from Iceland allows the identification of different potential volcanic source regions. This detailed geochemical analysis, when combined with Icelandic Ice Sheet (IIS) flow models for the Last Glacial Maximum (LGM), suggests that the IIS had calving margins to both the north and south during the late MIS 6 and that icebergs could have been transported to the Site U 1304 by following surface ocean circulation patterns similar to those that prevailed during the LGM. We demonstrate that the descriptive concept of Icelandic glass in the characterization of tephra components within North Atlantic IRD can be significantly improved through quantitative characterization and that such data hold the potential to help constrain surface ocean circulation models, while also potentially yielding new information about the IIS during earlier glacial periods. Other Non-Article Part of Journal/Newspaper Ice Sheet Iceland North Atlantic Geological Society of London: Figshare |
institution |
Open Polar |
collection |
Geological Society of London: Figshare |
op_collection_id |
ftgeosoclonfig |
language |
unknown |
topic |
Geology Site U 1304. Comparison Gardar Drift shard size distribution surface ocean circulation models Last Glacial Maximum shard sizes North Atlantic geochemical analysis MIS 6 deposits source regions MIS 6 Icelandic Ice Sheet characterization element composition Site U 1304 North Atlantic IRD Icelandic glass ocean surface circulation flow models IIS Marine Isotope Stage 6 surface ocean circulation patterns shard geochemistry tephra components LGM |
spellingShingle |
Geology Site U 1304. Comparison Gardar Drift shard size distribution surface ocean circulation models Last Glacial Maximum shard sizes North Atlantic geochemical analysis MIS 6 deposits source regions MIS 6 Icelandic Ice Sheet characterization element composition Site U 1304 North Atlantic IRD Icelandic glass ocean surface circulation flow models IIS Marine Isotope Stage 6 surface ocean circulation patterns shard geochemistry tephra components LGM Marion Kuhs William E. N. Austin Peter M. Abbott David A. Hodell Iceberg-rafted tephra as a potential tool for the reconstruction of ice-sheet processes and ocean surface circulation in the glacial North Atlantic |
topic_facet |
Geology Site U 1304. Comparison Gardar Drift shard size distribution surface ocean circulation models Last Glacial Maximum shard sizes North Atlantic geochemical analysis MIS 6 deposits source regions MIS 6 Icelandic Ice Sheet characterization element composition Site U 1304 North Atlantic IRD Icelandic glass ocean surface circulation flow models IIS Marine Isotope Stage 6 surface ocean circulation patterns shard geochemistry tephra components LGM |
description |
Ice-rafted tephra deposits, of Marine Isotope Stage 6 (MIS 6) age, from Site U 1304 on the Gardar Drift, North Atlantic were examined for their shard size distribution and major element composition. The heterogeneous composition, large shard sizes and association with ice-rafted debris (IRD) indicate that these late MIS 6 deposits were transported by iceberg-rafting from Iceland to Site U 1304. Comparison of individual shard geochemistry with the geochemistry of Holocene volcanic systems from Iceland allows the identification of different potential volcanic source regions. This detailed geochemical analysis, when combined with Icelandic Ice Sheet (IIS) flow models for the Last Glacial Maximum (LGM), suggests that the IIS had calving margins to both the north and south during the late MIS 6 and that icebergs could have been transported to the Site U 1304 by following surface ocean circulation patterns similar to those that prevailed during the LGM. We demonstrate that the descriptive concept of Icelandic glass in the characterization of tephra components within North Atlantic IRD can be significantly improved through quantitative characterization and that such data hold the potential to help constrain surface ocean circulation models, while also potentially yielding new information about the IIS during earlier glacial periods. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Marion Kuhs William E. N. Austin Peter M. Abbott David A. Hodell |
author_facet |
Marion Kuhs William E. N. Austin Peter M. Abbott David A. Hodell |
author_sort |
Marion Kuhs |
title |
Iceberg-rafted tephra as a potential tool for the reconstruction of ice-sheet processes and ocean surface circulation in the glacial North Atlantic |
title_short |
Iceberg-rafted tephra as a potential tool for the reconstruction of ice-sheet processes and ocean surface circulation in the glacial North Atlantic |
title_full |
Iceberg-rafted tephra as a potential tool for the reconstruction of ice-sheet processes and ocean surface circulation in the glacial North Atlantic |
title_fullStr |
Iceberg-rafted tephra as a potential tool for the reconstruction of ice-sheet processes and ocean surface circulation in the glacial North Atlantic |
title_full_unstemmed |
Iceberg-rafted tephra as a potential tool for the reconstruction of ice-sheet processes and ocean surface circulation in the glacial North Atlantic |
title_sort |
iceberg-rafted tephra as a potential tool for the reconstruction of ice-sheet processes and ocean surface circulation in the glacial north atlantic |
publishDate |
2016 |
url |
https://doi.org/10.6084/m9.figshare.3453629.v1 https://figshare.com/articles/Iceberg-rafted_tephra_as_a_potential_tool_for_the_reconstruction_of_ice-sheet_processes_and_ocean_surface_circulation_in_the___glacial_North_Atlantic/3453629 |
genre |
Ice Sheet Iceland North Atlantic |
genre_facet |
Ice Sheet Iceland North Atlantic |
op_relation |
doi:10.6084/m9.figshare.3453629.v1 https://figshare.com/articles/Iceberg-rafted_tephra_as_a_potential_tool_for_the_reconstruction_of_ice-sheet_processes_and_ocean_surface_circulation_in_the___glacial_North_Atlantic/3453629 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3453629.v1 |
_version_ |
1766030826716266496 |