Long-range transport of Icelandic tephra to the Irminger Basin, Site 919
International audience The 147-m-long sediment sequence recovered from Ocean Drilling Program Leg 152 Site 919 in the Irminger Basin contains several well-preserved volcanic ash layers and ash zones that provide a record of long-range transport of tephra from Iceland toward Greenland during the Plio...
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Format: | Book Part |
Language: | English |
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HAL CCSD
1998
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Online Access: | https://hal.science/hal-03119657 https://hal.science/hal-03119657/document https://hal.science/hal-03119657/file/CHAP_05%281%29.PDF https://doi.org/10.2973/odp.proc.sr.152.205.1998 |
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Open Polar |
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HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
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ftceafr |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Lacasse, C. Werner, R. Paterne, M. Sigurdsson, H. Carey, S. Pinte, G. Long-range transport of Icelandic tephra to the Irminger Basin, Site 919 |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience The 147-m-long sediment sequence recovered from Ocean Drilling Program Leg 152 Site 919 in the Irminger Basin contains several well-preserved volcanic ash layers and ash zones that provide a record of long-range transport of tephra from Iceland toward Greenland during the Pliocene−Pleistocene. A total of eight tephra layers and ash pods as well as three ash zones recovered in two separate holes (919A and 919B) were analyzed for major and trace element chemistry and grain size. Relative ages of the tephra layers were estimated based on oxygen isotope stratigraphy and correlation with other chronostratigraphic markers present in North Atlantic sediments and ice cores in Greenland. Based on their sorting coefficient and grain size, it is inferred that discrete ash layers between 1 and 5 cm thick are the result of ash fallout from large explosive eruptions. The tephra are bimodal (colorless/rhyolitic and sideromelane-tachylite/basaltic glass) or basaltic in composition, with crystal content between less than 15% for the discrete layers to more than 50% for the ash zones. The major element composition of glasses indicates two compositional groups: basaltic and rhyolitic. All of the tephra layers have an affinity with either a tholeiitic or an alkalic source in Iceland. Two separate mixed tephra layers, occurring between 10 and 11 m below seafloor at Site 919, were found to correlate with the ice-rafted ash Zone 2, based on their rhyolitic glass chemistry. Ash Zone 2 is a chronostratigraphic marker dated at about 55−57 ka in marine sediment and at about 52 ka in a Greenland ice core. The rhyolitic mixed tephra are interpreted to have been erupted during two large explosive eruptions of Tindfjallajökull volcano in southern Iceland, at a few hundred years interval. From the current pattern of seasonal variation in the atmospheric circulation over Iceland, it is suggested that the tephra were likely transported by easterly winds occurring at about 30 km elevation in midsummer, followed by fallout ... |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Géochrononologie Traceurs Archéométrie (GEOTRAC) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) |
format |
Book Part |
author |
Lacasse, C. Werner, R. Paterne, M. Sigurdsson, H. Carey, S. Pinte, G. |
author_facet |
Lacasse, C. Werner, R. Paterne, M. Sigurdsson, H. Carey, S. Pinte, G. |
author_sort |
Lacasse, C. |
title |
Long-range transport of Icelandic tephra to the Irminger Basin, Site 919 |
title_short |
Long-range transport of Icelandic tephra to the Irminger Basin, Site 919 |
title_full |
Long-range transport of Icelandic tephra to the Irminger Basin, Site 919 |
title_fullStr |
Long-range transport of Icelandic tephra to the Irminger Basin, Site 919 |
title_full_unstemmed |
Long-range transport of Icelandic tephra to the Irminger Basin, Site 919 |
title_sort |
long-range transport of icelandic tephra to the irminger basin, site 919 |
publisher |
HAL CCSD |
publishDate |
1998 |
url |
https://hal.science/hal-03119657 https://hal.science/hal-03119657/document https://hal.science/hal-03119657/file/CHAP_05%281%29.PDF https://doi.org/10.2973/odp.proc.sr.152.205.1998 |
long_lat |
ENVELOPE(-36.000,-36.000,61.000,61.000) ENVELOPE(-19.590,-19.590,63.796,63.796) |
geographic |
Greenland Irminger Basin Tindfjallajökull |
geographic_facet |
Greenland Irminger Basin Tindfjallajökull |
genre |
Greenland Greenland ice core ice core Iceland North Atlantic |
genre_facet |
Greenland Greenland ice core ice core Iceland North Atlantic |
op_source |
Proceedings of the Ocean Drilling Program, 152 Scientific Results https://hal.science/hal-03119657 Proceedings of the Ocean Drilling Program, 152 Scientific Results, 152, Ocean Drilling Program, 1998, Proceedings of the Ocean Drilling Program, ⟨10.2973/odp.proc.sr.152.205.1998⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.2973/odp.proc.sr.152.205.1998 hal-03119657 https://hal.science/hal-03119657 https://hal.science/hal-03119657/document https://hal.science/hal-03119657/file/CHAP_05%281%29.PDF doi:10.2973/odp.proc.sr.152.205.1998 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.2973/odp.proc.sr.152.205.1998 |
_version_ |
1801376212016168960 |
spelling |
ftceafr:oai:HAL:hal-03119657v1 2024-06-09T07:46:23+00:00 Long-range transport of Icelandic tephra to the Irminger Basin, Site 919 Lacasse, C. Werner, R. Paterne, M. Sigurdsson, H. Carey, S. Pinte, G. Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Géochrononologie Traceurs Archéométrie (GEOTRAC) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) 1998-05 https://hal.science/hal-03119657 https://hal.science/hal-03119657/document https://hal.science/hal-03119657/file/CHAP_05%281%29.PDF https://doi.org/10.2973/odp.proc.sr.152.205.1998 en eng HAL CCSD Ocean Drilling Program info:eu-repo/semantics/altIdentifier/doi/10.2973/odp.proc.sr.152.205.1998 hal-03119657 https://hal.science/hal-03119657 https://hal.science/hal-03119657/document https://hal.science/hal-03119657/file/CHAP_05%281%29.PDF doi:10.2973/odp.proc.sr.152.205.1998 info:eu-repo/semantics/OpenAccess Proceedings of the Ocean Drilling Program, 152 Scientific Results https://hal.science/hal-03119657 Proceedings of the Ocean Drilling Program, 152 Scientific Results, 152, Ocean Drilling Program, 1998, Proceedings of the Ocean Drilling Program, ⟨10.2973/odp.proc.sr.152.205.1998⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/bookPart Book sections 1998 ftceafr https://doi.org/10.2973/odp.proc.sr.152.205.1998 2024-05-16T14:35:30Z International audience The 147-m-long sediment sequence recovered from Ocean Drilling Program Leg 152 Site 919 in the Irminger Basin contains several well-preserved volcanic ash layers and ash zones that provide a record of long-range transport of tephra from Iceland toward Greenland during the Pliocene−Pleistocene. A total of eight tephra layers and ash pods as well as three ash zones recovered in two separate holes (919A and 919B) were analyzed for major and trace element chemistry and grain size. Relative ages of the tephra layers were estimated based on oxygen isotope stratigraphy and correlation with other chronostratigraphic markers present in North Atlantic sediments and ice cores in Greenland. Based on their sorting coefficient and grain size, it is inferred that discrete ash layers between 1 and 5 cm thick are the result of ash fallout from large explosive eruptions. The tephra are bimodal (colorless/rhyolitic and sideromelane-tachylite/basaltic glass) or basaltic in composition, with crystal content between less than 15% for the discrete layers to more than 50% for the ash zones. The major element composition of glasses indicates two compositional groups: basaltic and rhyolitic. All of the tephra layers have an affinity with either a tholeiitic or an alkalic source in Iceland. Two separate mixed tephra layers, occurring between 10 and 11 m below seafloor at Site 919, were found to correlate with the ice-rafted ash Zone 2, based on their rhyolitic glass chemistry. Ash Zone 2 is a chronostratigraphic marker dated at about 55−57 ka in marine sediment and at about 52 ka in a Greenland ice core. The rhyolitic mixed tephra are interpreted to have been erupted during two large explosive eruptions of Tindfjallajökull volcano in southern Iceland, at a few hundred years interval. From the current pattern of seasonal variation in the atmospheric circulation over Iceland, it is suggested that the tephra were likely transported by easterly winds occurring at about 30 km elevation in midsummer, followed by fallout ... Book Part Greenland Greenland ice core ice core Iceland North Atlantic HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Greenland Irminger Basin ENVELOPE(-36.000,-36.000,61.000,61.000) Tindfjallajökull ENVELOPE(-19.590,-19.590,63.796,63.796) |