Quarternary tephra layers in sediment cores from the Bellingshausen Sea and Scotia Sea
The Southern Ocean is a region of the world's ocean which is fundamental to the generation of cold deep ocean water which drives the global therrno-haline circulation. Previous investigations of deep-sea sediments south of the Polar Front have been significantly constrained by the lack of a sui...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.671682 2023-05-15T15:41:23+02:00 Quarternary tephra layers in sediment cores from the Bellingshausen Sea and Scotia Sea Moreton, Steven Grahame MEDIAN LATITUDE: -63.128193 * MEDIAN LONGITUDE: -65.653825 * SOUTH-BOUND LATITUDE: -69.218333 * WEST-BOUND LONGITUDE: -91.883333 * NORTH-BOUND LATITUDE: -51.950000 * EAST-BOUND LONGITUDE: -39.178300 * DATE/TIME START: 1991-09-05T00:00:00 * DATE/TIME END: 1995-02-14T06:06:00 2007-12-07 application/zip, 47 datasets https://doi.pangaea.de/10.1594/PANGAEA.671682 https://doi.org/10.1594/PANGAEA.671682 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.671682 https://doi.org/10.1594/PANGAEA.671682 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Moreton, Steven Grahame (1999): Quaternary tephrochronology of the Scotia Sea and Bellingshausen Sea, Antarctica. PhD Thesis, Cheltenham and Gloucester College of Higher Education, 164 pp, https://store.pangaea.de/Publications/MoretonSG_1999/MoretonSG_thesis_1999.pdf Drake Passage E11-21 E11-22 E42-11 E5-24 Explorer FoxBay GC GC027 GC037 GC105 GC114 Gravity corer HAND KC081 PC PC029 PC063 PC078 PC079 PC103 PC106 PC108 PC110 PC111 PC113 Piston corer Sampling by hand SED-04 SED-06 SED-07 SEDANO-I Dataset 2007 ftpangaea https://doi.org/10.1594/PANGAEA.671682 2023-01-20T07:31:06Z The Southern Ocean is a region of the world's ocean which is fundamental to the generation of cold deep ocean water which drives the global therrno-haline circulation. Previous investigations of deep-sea sediments south of the Polar Front have been significantly constrained by the lack of a suitable correlation and dating technique. In this study, deep-sea sediment cores from the Bellingshausen, Scotia and Weddell seas have been investigated for the presence of tephra layers. The major oxide and trace element composition of glass shards have been used to correlate tephra isochrons over distances in excess of 600 km. The source volcanoes for individual tephra layers have been identified. Atmospheric transport distances greater than 1500 km for >32 pm shards are reported. One megascopic tephra is identified and correlated across 7 sediment drifts on the continental rise in the Bellingshausen Sea. Its occurrence in a sedimentary unit that has been biostratigraphically dated to delta 18O substage 5e identifies it as a key regional marker horizon for that stage. An unusual bimodal megascopic ash layer erupted from Deception Island, South Shetland Islands, has been correlated between 6 sediment cores which form a 600 km NE-SW transect from the central Scotia Sea to Jane Basin. This megascopic ash layer has been 14C dated at c. 10,670 years BP. It represents the last significant input of tephra into the Scotia Sea or Jane Basin from that volcano and forms an important early Holocene marker horizon for the region. Five disseminated tephras can be correlated to varying extents across the central Scotia Sea cores. Together with the megascopic tephra they form a tephrostratigraphic framework that will greatly aid palaeoclimatic, palaeoenvironrnental and palaeoceanographic investigations in the region. Dataset Bellingshausen Sea Deception Island Drake Passage Scotia Sea South Shetland Islands Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Southern Ocean Drake Passage Scotia Sea South Shetland Islands Bellingshausen Sea Weddell Deception Island ENVELOPE(-60.633,-60.633,-62.950,-62.950) Jane Basin ENVELOPE(-41.909,-41.909,-61.890,-61.890) ENVELOPE(-91.883333,-39.178300,-51.950000,-69.218333) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Drake Passage E11-21 E11-22 E42-11 E5-24 Explorer FoxBay GC GC027 GC037 GC105 GC114 Gravity corer HAND KC081 PC PC029 PC063 PC078 PC079 PC103 PC106 PC108 PC110 PC111 PC113 Piston corer Sampling by hand SED-04 SED-06 SED-07 SEDANO-I |
spellingShingle |
Drake Passage E11-21 E11-22 E42-11 E5-24 Explorer FoxBay GC GC027 GC037 GC105 GC114 Gravity corer HAND KC081 PC PC029 PC063 PC078 PC079 PC103 PC106 PC108 PC110 PC111 PC113 Piston corer Sampling by hand SED-04 SED-06 SED-07 SEDANO-I Moreton, Steven Grahame Quarternary tephra layers in sediment cores from the Bellingshausen Sea and Scotia Sea |
topic_facet |
Drake Passage E11-21 E11-22 E42-11 E5-24 Explorer FoxBay GC GC027 GC037 GC105 GC114 Gravity corer HAND KC081 PC PC029 PC063 PC078 PC079 PC103 PC106 PC108 PC110 PC111 PC113 Piston corer Sampling by hand SED-04 SED-06 SED-07 SEDANO-I |
description |
The Southern Ocean is a region of the world's ocean which is fundamental to the generation of cold deep ocean water which drives the global therrno-haline circulation. Previous investigations of deep-sea sediments south of the Polar Front have been significantly constrained by the lack of a suitable correlation and dating technique. In this study, deep-sea sediment cores from the Bellingshausen, Scotia and Weddell seas have been investigated for the presence of tephra layers. The major oxide and trace element composition of glass shards have been used to correlate tephra isochrons over distances in excess of 600 km. The source volcanoes for individual tephra layers have been identified. Atmospheric transport distances greater than 1500 km for >32 pm shards are reported. One megascopic tephra is identified and correlated across 7 sediment drifts on the continental rise in the Bellingshausen Sea. Its occurrence in a sedimentary unit that has been biostratigraphically dated to delta 18O substage 5e identifies it as a key regional marker horizon for that stage. An unusual bimodal megascopic ash layer erupted from Deception Island, South Shetland Islands, has been correlated between 6 sediment cores which form a 600 km NE-SW transect from the central Scotia Sea to Jane Basin. This megascopic ash layer has been 14C dated at c. 10,670 years BP. It represents the last significant input of tephra into the Scotia Sea or Jane Basin from that volcano and forms an important early Holocene marker horizon for the region. Five disseminated tephras can be correlated to varying extents across the central Scotia Sea cores. Together with the megascopic tephra they form a tephrostratigraphic framework that will greatly aid palaeoclimatic, palaeoenvironrnental and palaeoceanographic investigations in the region. |
format |
Dataset |
author |
Moreton, Steven Grahame |
author_facet |
Moreton, Steven Grahame |
author_sort |
Moreton, Steven Grahame |
title |
Quarternary tephra layers in sediment cores from the Bellingshausen Sea and Scotia Sea |
title_short |
Quarternary tephra layers in sediment cores from the Bellingshausen Sea and Scotia Sea |
title_full |
Quarternary tephra layers in sediment cores from the Bellingshausen Sea and Scotia Sea |
title_fullStr |
Quarternary tephra layers in sediment cores from the Bellingshausen Sea and Scotia Sea |
title_full_unstemmed |
Quarternary tephra layers in sediment cores from the Bellingshausen Sea and Scotia Sea |
title_sort |
quarternary tephra layers in sediment cores from the bellingshausen sea and scotia sea |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.671682 https://doi.org/10.1594/PANGAEA.671682 |
op_coverage |
MEDIAN LATITUDE: -63.128193 * MEDIAN LONGITUDE: -65.653825 * SOUTH-BOUND LATITUDE: -69.218333 * WEST-BOUND LONGITUDE: -91.883333 * NORTH-BOUND LATITUDE: -51.950000 * EAST-BOUND LONGITUDE: -39.178300 * DATE/TIME START: 1991-09-05T00:00:00 * DATE/TIME END: 1995-02-14T06:06:00 |
long_lat |
ENVELOPE(-60.633,-60.633,-62.950,-62.950) ENVELOPE(-41.909,-41.909,-61.890,-61.890) ENVELOPE(-91.883333,-39.178300,-51.950000,-69.218333) |
geographic |
Southern Ocean Drake Passage Scotia Sea South Shetland Islands Bellingshausen Sea Weddell Deception Island Jane Basin |
geographic_facet |
Southern Ocean Drake Passage Scotia Sea South Shetland Islands Bellingshausen Sea Weddell Deception Island Jane Basin |
genre |
Bellingshausen Sea Deception Island Drake Passage Scotia Sea South Shetland Islands Southern Ocean |
genre_facet |
Bellingshausen Sea Deception Island Drake Passage Scotia Sea South Shetland Islands Southern Ocean |
op_source |
Supplement to: Moreton, Steven Grahame (1999): Quaternary tephrochronology of the Scotia Sea and Bellingshausen Sea, Antarctica. PhD Thesis, Cheltenham and Gloucester College of Higher Education, 164 pp, https://store.pangaea.de/Publications/MoretonSG_1999/MoretonSG_thesis_1999.pdf |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.671682 https://doi.org/10.1594/PANGAEA.671682 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.671682 |
_version_ |
1766374304471056384 |