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Moreton, Steven Grahame (2007): Quarternary tephra layers in sediment cores from the Bellingshausen Sea and Scotia Sea. 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, http://store.pangaea.de/Publications/MoretonSG_1999/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):
E11-21 * Latitude: -68.746667 * Longitude: -91.883333 * Elevation: -2240.0 m * Recovery: 2.5 m * Device: Gravity corer (GC)
E11-22 * Latitude: -67.940000 * Longitude: -90.831667 * Elevation: -2264.0 m * Recovery: 12.8 m * Device: Gravity corer (GC)
E42-11 * Latitude: -69.218333 * Longitude: -88.406667 * Elevation: -1850.0 m * Recovery: 5 m * Device: Gravity corer (GC)
Size:
47 datasets

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Datasets listed in this Collection

  1. 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
  2. Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core GC105; appendix III. https://doi.org/10.1594/PANGAEA.351682
  3. Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC103; appendix III. https://doi.org/10.1594/PANGAEA.351683
  4. Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC106; appendix III. https://doi.org/10.1594/PANGAEA.351684
  5. Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC108; appendix III. https://doi.org/10.1594/PANGAEA.351685
  6. Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC110; appendix III. https://doi.org/10.1594/PANGAEA.351687
  7. Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC111; appendix III. https://doi.org/10.1594/PANGAEA.351688
  8. Moreton, SG (2006): Long axis measurements of sediment drift glass shards on sediment core PC113; appendix III. https://doi.org/10.1594/PANGAEA.351689
  9. 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
  10. 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
  11. 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
  12. Moreton, SG (2006): Major element compositions on glass shards of sediment core E11-21; appendix I. https://doi.org/10.1594/PANGAEA.351575
  13. Moreton, SG (2006): Major element compositions on glass shards of sediment core E11-22; appendix I. https://doi.org/10.1594/PANGAEA.351577
  14. Moreton, SG (2006): Major element compositions on glass shards of sediment core E42-11; appendix I. https://doi.org/10.1594/PANGAEA.351578
  15. Moreton, SG (2006): Major element compositions on glass shards of sediment core E5-24; appendix I. https://doi.org/10.1594/PANGAEA.351579
  16. Moreton, SG (2006): Major element compositions on glass shards of sediment core FoxBay; appendix I. https://doi.org/10.1594/PANGAEA.351580
  17. Moreton, SG (2006): Major element compositions on glass shards of sediment core GC027; appendix I. https://doi.org/10.1594/PANGAEA.351581
  18. Moreton, SG (2006): Major element compositions on glass shards of sediment core GC037; appendix I. https://doi.org/10.1594/PANGAEA.351582
  19. Moreton, SG (2006): Major element compositions on glass shards of sediment core GC105; appendix I. https://doi.org/10.1594/PANGAEA.351583
  20. Moreton, SG (2006): Major element compositions on glass shards of sediment core GC114; appendix I. https://doi.org/10.1594/PANGAEA.351584
  21. Moreton, SG (2006): Major element compositions on glass shards of sediment core KC081; appendix I. https://doi.org/10.1594/PANGAEA.351585
  22. Moreton, SG (2006): Major element compositions on glass shards of sediment core PC029; appendix I. https://doi.org/10.1594/PANGAEA.351587
  23. Moreton, SG (2006): Major element compositions on glass shards of sediment core PC063; appendix I. https://doi.org/10.1594/PANGAEA.351588
  24. Moreton, SG (2006): Major element compositions on glass shards of sediment core PC078; appendix I. https://doi.org/10.1594/PANGAEA.351589
  25. Moreton, SG (2006): Major element compositions on glass shards of sediment core PC079; appendix I. https://doi.org/10.1594/PANGAEA.351590
  26. Moreton, SG (2006): Major element compositions on glass shards of sediment core PC103; appendix I. https://doi.org/10.1594/PANGAEA.351591
  27. Moreton, SG (2006): Major element compositions on glass shards of sediment core PC106; appendix I. https://doi.org/10.1594/PANGAEA.351592
  28. Moreton, SG (2006): Major element compositions on glass shards of sediment core PC108; appendix I. https://doi.org/10.1594/PANGAEA.351593
  29. Moreton, SG (2006): Major element compositions on glass shards of sediment core PC110; appendix I. https://doi.org/10.1594/PANGAEA.351594
  30. Moreton, SG (2006): Major element compositions on glass shards of sediment core PC111; appendix I. https://doi.org/10.1594/PANGAEA.351595
  31. Moreton, SG (2006): Major element compositions on glass shards of sediment core PC113; appendix I. https://doi.org/10.1594/PANGAEA.351596
  32. Moreton, SG (2006): Major element compositions on glass shards of sediment core SED-04; appendix I. https://doi.org/10.1594/PANGAEA.351597
  33. Moreton, SG (2006): Major element compositions on glass shards of sediment core SED-06; appendix I. https://doi.org/10.1594/PANGAEA.351598
  34. Moreton, SG (2006): Major element compositions on glass shards of sediment core SED-07; appendix I. https://doi.org/10.1594/PANGAEA.351599
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. Moreton, SG (2006): Number of glass shard length in seven size categories. https://doi.org/10.1594/PANGAEA.354790
  41. Moreton, SG (2006): Trace element compositions from two sediment drift tephra layers; Tab 3.4. https://doi.org/10.1594/PANGAEA.354778
  42. Moreton, SG (2006): Trace element compositions of sediment core SED-06; Tab 3.5. https://doi.org/10.1594/PANGAEA.351920
  43. Moreton, SG (2006): Trace element compositions on glass shards of sediment core KC081; appendix II. https://doi.org/10.1594/PANGAEA.351672
  44. Moreton, SG (2006): Trace element compositions on glass shards of sediment core PC029; appendix II. https://doi.org/10.1594/PANGAEA.351673
  45. Moreton, SG (2006): Trace element compositions on glass shards of sediment core PC079; appendix II. https://doi.org/10.1594/PANGAEA.351674
  46. Moreton, SG (2006): Trace element compositions on glass shards of sediment core PC108; appendix II. https://doi.org/10.1594/PANGAEA.351675
  47. Moreton, SG (2006): Trace element compositions on glass shards of sediment core PC111; appendix II. https://doi.org/10.1594/PANGAEA.351676