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Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Graham, Alastair G C; Smith, James A; Larter, Robert D; Gohl, Karsten (2014): Sedimentological analysis of eight cores from the Amundsen Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.818175, Supplement to: Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Graham, Alastair G C; Smith, James A; Larter, Robert D; Gohl, Karsten; Wacker, Lukas (2014): Retreat of the West Antarctic Ice Sheet from the western Amundsen Sea shelf at a pre- or early LGM stage. Quaternary Science Reviews, 91, 1-15, https://doi.org/10.1016/j.quascirev.2014.02.017

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Abstract:
Recent palaeoglaciological studies on the West Antarctic shelf have mainly focused on the wide embayments of the Ross and Amundsen seas in order to reconstruct the extent and subsequent retreat of the West Antarctic Ice Sheet (WAIS) since the Last Glacial Maximum (LGM). However, the narrower shelf sectors between these two major embayments have remained largely unstudied in previous geological investigations despite them covering extensive areas of the West Antarctic shelf. Here, we present the first systematic marine geological and geophysical survey of a shelf sector offshore from the Hobbs Coast. It is dominated by a large grounding zone wedge (GZW), which fills the base of a palaeo-ice stream trough on the inner shelf and marks a phase of stabilization of the grounding line during general WAIS retreat following the last maximum ice-sheet extent in this particular area (referred to as the Local Last Glacial Maximum, 'LLGM'). Reliable age determination on calcareous microfossils from the infill of a subglacial meltwater channel eroded into the GZW reveals that grounded ice had retreated landward of the GZW before ~20.88 cal. ka BP, with deglaciation of the innermost shelf occurring prior to ~12.97 cal. ka BP. Geophysical sub-bottom information from the inner-, mid- and outer shelf indicates grounded ice extended to the shelf edge prior to the formation of the GZW. Assuming the wedge was deposited during deglaciation, we infer the timing of maximum grounded ice extent occurred before ~20.88 cal. ka BP. This could suggest that the WAIS retreat from the outer shelf was already underway during or even prior to the global LGM (~23-19 cal. ka BP). Our new findings give insights into the regional deglacial behaviour of this understudied part of the West Antarctic shelf and at the same time support early deglaciation ages recently presented for adjacent drainage sectors of the WAIS. If correct, these findings contrast with the hypothesis that initial deglaciation of Antarctic Ice Sheets occurred synchronously at ~19 cal. ka BP.
Project(s):
Paleoenvironmental Reconstructions from Marine Sediments @ AWI (AWI_Paleo)
Coverage:
Median Latitude: -74.362225 * Median Longitude: -134.235108 * South-bound Latitude: -74.509000 * West-bound Longitude: -135.055160 * North-bound Latitude: -74.100160 * East-bound Longitude: -133.078000
Date/Time Start: 2010-02-18T20:37:00 * Date/Time End: 2010-02-21T04:16:00
Event(s):
PS75/128-1 * Latitude: -74.483000 * Longitude: -133.967330 * Date/Time: 2010-02-18T20:37:00 * Elevation: -895.0 m * Penetration: 3.1 m * Recovery: 2.2 m * Location: westernmost Getz Trough, inner shelf (lineations on acoustic basement) * Campaign: ANT-XXVI/3 (PS75) * Basis: Polarstern * Method/Device: Gravity corer (Kiel type) (SL) * Comment: 3 core sections: 0-0.21, 0.21-1.2, 1.2-2.2 m
PS75/129-1 * Latitude: -74.509000 * Longitude: -134.120830 * Date/Time: 2010-02-18T22:40:00 * Elevation: -923.0 m * Penetration: 3.5 m * Recovery: 2.58 m * Location: westernmost Getz Trough, inner shelf (meltwater channel) * Campaign: ANT-XXVI/3 (PS75) * Basis: Polarstern * Method/Device: Gravity corer (Kiel type) (SL) * Comment: 3 core sections: 0-0.58, .58-1.58, 1.58-2.58, 2.58 m
PS75/130-1 * Latitude: -74.445160 * Longitude: -134.152830 * Date/Time: 2010-02-19T01:20:00 * Elevation: -794.0 m * Penetration: 3.8 m * Recovery: 3.19 m * Location: westernmost Getz Trough, inner shelf (basin south of GZW) * Campaign: ANT-XXVI/3 (PS75) * Basis: Polarstern * Method/Device: Gravity corer (Kiel type) (SL) * Comment: 4 core sections: 0-0.19, 0.19-1.19, 1.19-2.19, 2.19-3.19 m
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
54 datasets

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Datasets listed in this publication series

  1. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Documentation of sediment core PS75/128-1. https://doi.org/10.1594/PANGAEA.784112
  2. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Documentation of sediment core PS75/130-1. https://doi.org/10.1594/PANGAEA.784113
  3. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Documentation of sediment core PS75/138-1. https://doi.org/10.1594/PANGAEA.784114
  4. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Documentation of sediment core PS75/139-2. https://doi.org/10.1594/PANGAEA.784115
  5. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Grain size composition of sediment core PS75/128-1. https://doi.org/10.1594/PANGAEA.818167
  6. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Shear strength of sediment core PS75/128-1. https://doi.org/10.1594/PANGAEA.818148
  7. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/128-1. https://doi.org/10.1594/PANGAEA.819158
  8. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Water content of sediment core PS75/128-1. https://doi.org/10.1594/PANGAEA.818140
  9. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Grain size composition of sediment core PS75/129-1. https://doi.org/10.1594/PANGAEA.818168
  10. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Shear strength of sediment core PS75/129-1. https://doi.org/10.1594/PANGAEA.818149
  11. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/129-1. https://doi.org/10.1594/PANGAEA.819159
  12. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Total organic carbon content of sediment core PS75/129-1. https://doi.org/10.1594/PANGAEA.818156
  13. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Sound velocity in sediment core PS75/129-1. https://doi.org/10.1594/PANGAEA.818444
  14. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Wet bulk density of sediment core PS75/129-1. https://doi.org/10.1594/PANGAEA.818126
  15. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Radiocarbon dating of sediment core PS75/130-1. https://doi.org/10.1594/PANGAEA.818163
  16. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Grain size composition of sediment core PS75/130-1. https://doi.org/10.1594/PANGAEA.818169
  17. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Shear strength of sediment core PS75/130-1. https://doi.org/10.1594/PANGAEA.818150
  18. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/130-1. https://doi.org/10.1594/PANGAEA.819160
  19. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Total organic carbon content of sediment core PS75/130-1. https://doi.org/10.1594/PANGAEA.818157
  20. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Water content of sediment core PS75/130-1. https://doi.org/10.1594/PANGAEA.818142
  21. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Wet bulk density of sediment core PS75/130-1. https://doi.org/10.1594/PANGAEA.818134
  22. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Grain size composition of sediment core PS75/132-3. https://doi.org/10.1594/PANGAEA.818170
  23. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Shear strength of sediment core PS75/132-3. https://doi.org/10.1594/PANGAEA.818151
  24. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/132-3. https://doi.org/10.1594/PANGAEA.819161
  25. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Total organic carbon content of sediment core PS75/132-3. https://doi.org/10.1594/PANGAEA.818158
  26. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Water content of sediment core PS75/132-3. https://doi.org/10.1594/PANGAEA.818143
  27. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Wet bulk density of sediment core PS75/132-3. https://doi.org/10.1594/PANGAEA.818135
  28. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Radiocarbon dating of sediment core PS75/133-1. https://doi.org/10.1594/PANGAEA.818164
  29. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Grain size composition of sediment core PS75/133-1. https://doi.org/10.1594/PANGAEA.818171
  30. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Shear strength of sediment core PS75/133-1. https://doi.org/10.1594/PANGAEA.818152
  31. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/133-1. https://doi.org/10.1594/PANGAEA.819162
  32. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Total organic carbon content of sediment core PS75/133-1. https://doi.org/10.1594/PANGAEA.818159
  33. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Sound velocity in sediment core PS75/133-1. https://doi.org/10.1594/PANGAEA.818445
  34. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Water content of sediment core PS75/133-1. https://doi.org/10.1594/PANGAEA.818144
  35. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Wet bulk density of sediment core PS75/133-1. https://doi.org/10.1594/PANGAEA.818136
  36. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Radiocarbon dating of sediment core PS75/136-3. https://doi.org/10.1594/PANGAEA.818165
  37. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Grain size composition of sediment core PS75/136-3. https://doi.org/10.1594/PANGAEA.818172
  38. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Shear strength of sediment core PS75/136-3. https://doi.org/10.1594/PANGAEA.818153
  39. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/136-3. https://doi.org/10.1594/PANGAEA.819163
  40. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Total organic carbon content of sediment core PS75/136-3. https://doi.org/10.1594/PANGAEA.818160
  41. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Sound velocity in sediment core PS75/136-3. https://doi.org/10.1594/PANGAEA.818446
  42. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Water content of sediment core PS75/136-3. https://doi.org/10.1594/PANGAEA.818145
  43. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Wet bulk density of sediment core PS75/136-3. https://doi.org/10.1594/PANGAEA.818137
  44. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Grain size composition of sediment core PS75/138-1. https://doi.org/10.1594/PANGAEA.818173
  45. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Shear strength of sediment core PS75/138-1. https://doi.org/10.1594/PANGAEA.818154
  46. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/138-1. https://doi.org/10.1594/PANGAEA.819164
  47. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Water content of sediment core PS75/138-1. https://doi.org/10.1594/PANGAEA.818146
  48. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Radiocarbon dating of sediment core PS75/139-2. https://doi.org/10.1594/PANGAEA.818166
  49. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Grain size composition of sediment core PS75/139-2. https://doi.org/10.1594/PANGAEA.818174
  50. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Shear strength of sediment core PS75/139-2. https://doi.org/10.1594/PANGAEA.818155
  51. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/139-2. https://doi.org/10.1594/PANGAEA.819165
  52. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Total organic carbon content of sediment core PS75/139-2. https://doi.org/10.1594/PANGAEA.818161
  53. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Water content of sediment core PS75/139-2. https://doi.org/10.1594/PANGAEA.818147
  54. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Wet bulk density of sediment core PS75/139-2. https://doi.org/10.1594/PANGAEA.818138