Moreton, Steven Grahame (2007): Quarternary tephra layers in sediment cores from the Bellingshausen Sea and Scotia Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.671682, Supplement to: Moreton, SG (1999): Quaternary tephrochronology of the Scotia Sea and Bellingshausen Sea, Antarctica. PhD Thesis, Cheltenham and Gloucester College of Higher Education, 164 pp, MoretonSG_thesis_1999.pdf
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Abstract:
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.
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
Event(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
47 datasets
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Datasets listed in this publication series
- Moreton, SG (2006): Major oxide geochemical compositions of glass shards from the southern Bellingshausen Sea tephra layers; Tab 3.6. https://doi.org/10.1594/PANGAEA.352106
- Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core E5-24; appendix III. https://doi.org/10.1594/PANGAEA.351678
- Moreton, SG (2006): Major element compositions on glass shards of sediment core E5-24; appendix I. https://doi.org/10.1594/PANGAEA.351579
- Moreton, SG (2006): Major element compositions on glass shards of sediment core E11-21; appendix I. https://doi.org/10.1594/PANGAEA.351575
- Moreton, SG (2006): Major element compositions on glass shards of sediment core E11-22; appendix I. https://doi.org/10.1594/PANGAEA.351577
- Moreton, SG (2006): Major element compositions on glass shards of sediment core E42-11; appendix I. https://doi.org/10.1594/PANGAEA.351578
- Moreton, SG (2006): Major element compositions on glass shards of sediment core FoxBay; appendix I. https://doi.org/10.1594/PANGAEA.351580
- Moreton, SG (2006): Major element compositions on glass shards of sediment core GC027; appendix I. https://doi.org/10.1594/PANGAEA.351581
- Moreton, SG (2006): Major element compositions on glass shards of sediment core GC037; appendix I. https://doi.org/10.1594/PANGAEA.351582
- Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core GC105; appendix III. https://doi.org/10.1594/PANGAEA.351682
- Moreton, SG (2006): Major element compositions on glass shards of sediment core GC105; appendix I. https://doi.org/10.1594/PANGAEA.351583
- Moreton, SG (2006): Major element compositions on glass shards of sediment core GC114; appendix I. https://doi.org/10.1594/PANGAEA.351584
- Moreton, SG (2006): Major element compositions on glass shards of sediment core KC081; appendix I. https://doi.org/10.1594/PANGAEA.351585
- Moreton, SG (2006): Trace element compositions on glass shards of sediment core KC081; appendix II. https://doi.org/10.1594/PANGAEA.351672
- Moreton, SG (2006): Number of glass shard length in seven size categories. https://doi.org/10.1594/PANGAEA.354790
- Moreton, SG (2006): Major element compositions on glass shards of sediment core PC029; appendix I. https://doi.org/10.1594/PANGAEA.351587
- Moreton, SG (2006): Trace element compositions on glass shards of sediment core PC029; appendix II. https://doi.org/10.1594/PANGAEA.351673
- Moreton, SG (2006): Major element compositions on glass shards of sediment core PC063; appendix I. https://doi.org/10.1594/PANGAEA.351588
- Moreton, SG (2006): Major oxide geochemical compositions of glass shards from disseminated tephras in sediment core PC063; Tab 4.1. https://doi.org/10.1594/PANGAEA.354754
- Moreton, SG (2006): Major element compositions on glass shards of sediment core PC078; appendix I. https://doi.org/10.1594/PANGAEA.351589
- Moreton, SG (2006): Major element compositions on glass shards of sediment core PC079; appendix I. https://doi.org/10.1594/PANGAEA.351590
- Moreton, SG (2006): Trace element compositions on glass shards of sediment core PC079; appendix II. https://doi.org/10.1594/PANGAEA.351674
- Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC103; appendix III. https://doi.org/10.1594/PANGAEA.351683
- Moreton, SG (2006): Major element compositions on glass shards of sediment core PC103; appendix I. https://doi.org/10.1594/PANGAEA.351591
- Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC106; appendix III. https://doi.org/10.1594/PANGAEA.351684
- Moreton, SG (2006): Major element compositions on glass shards of sediment core PC106; appendix I. https://doi.org/10.1594/PANGAEA.351592
- Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC108; appendix III. https://doi.org/10.1594/PANGAEA.351685
- Moreton, SG (2006): Major element compositions on glass shards of sediment core PC108; appendix I. https://doi.org/10.1594/PANGAEA.351593
- Moreton, SG (2006): Trace element compositions from two sediment drift tephra layers; Tab 3.4. https://doi.org/10.1594/PANGAEA.354778
- Moreton, SG (2006): Trace element compositions on glass shards of sediment core PC108; appendix II. https://doi.org/10.1594/PANGAEA.351675
- Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC110; appendix III. https://doi.org/10.1594/PANGAEA.351687
- Moreton, SG (2006): Major element compositions on glass shards of sediment core PC110; appendix I. https://doi.org/10.1594/PANGAEA.351594
- Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC111; appendix III. https://doi.org/10.1594/PANGAEA.351688
- Moreton, SG (2006): Major element compositions on glass shards of sediment core PC111; appendix I. https://doi.org/10.1594/PANGAEA.351595
- Moreton, SG (2006): Trace element compositions on glass shards of sediment core PC111; appendix II. https://doi.org/10.1594/PANGAEA.351676
- Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC113; appendix III. https://doi.org/10.1594/PANGAEA.351689
- Moreton, SG (2006): Major element compositions on glass shards of sediment core PC113; appendix I. https://doi.org/10.1594/PANGAEA.351596
- Moreton, SG (2006): Major oxide geochemical compositions of glass shards from disseminated tephra layers in Unit U below the visible ash layer from the Scotia Sea; Tab 4.4. https://doi.org/10.1594/PANGAEA.354776
- Moreton, SG (2006): Major oxide geochemical compositions of glass shards from disseminated tephras above the megascopic ash from the Scotia Sea; Tab 4.3. https://doi.org/10.1594/PANGAEA.354774
- Moreton, SG (2006): Major oxide compositions for the basaltic and rhyolitic clusters of the visible ash layers from the Scotia Sea; Tab 4.2. https://doi.org/10.1594/PANGAEA.354765
- Moreton, SG (2006): Major element compositions on glass shards of sediment core SED-04; appendix I. https://doi.org/10.1594/PANGAEA.351597
- Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core SED-06 (lower); appendix III. https://doi.org/10.1594/PANGAEA.351730
- Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core SED-06 (upper); appendix III. https://doi.org/10.1594/PANGAEA.351733
- Moreton, SG (2006): Major element compositions on glass shards of sediment core SED-06; appendix I. https://doi.org/10.1594/PANGAEA.351598
- Moreton, SG (2006): Trace element compositions of sediment core SED-06; Tab 3.5. https://doi.org/10.1594/PANGAEA.351920
- Moreton, SG (2006): Major element compositions on glass shards of sediment core SED-07; appendix I. https://doi.org/10.1594/PANGAEA.351599
- Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core SED-07; appendix III. https://doi.org/10.1594/PANGAEA.351736