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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. 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.
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 * 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 * 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 * 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
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): Grain size composition of sediment core PS75/129-1. https://doi.org/10.1594/PANGAEA.818168
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/128-1. https://doi.org/10.1594/PANGAEA.819158
  29. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/129-1. https://doi.org/10.1594/PANGAEA.819159
  30. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/130-1. https://doi.org/10.1594/PANGAEA.819160
  31. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/132-3. https://doi.org/10.1594/PANGAEA.819161
  32. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/133-1. https://doi.org/10.1594/PANGAEA.819162
  33. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/136-3. https://doi.org/10.1594/PANGAEA.819163
  34. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/138-1. https://doi.org/10.1594/PANGAEA.819164
  35. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2014): Susceptibility of sediment core PS75/139-2. https://doi.org/10.1594/PANGAEA.819165
  36. 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
  37. 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
  38. 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
  39. 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
  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): Total organic carbon content of sediment core PS75/139-2. https://doi.org/10.1594/PANGAEA.818161
  42. 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
  43. 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
  44. 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
  45. 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
  46. 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
  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): Water content of sediment core PS75/139-2. https://doi.org/10.1594/PANGAEA.818147
  49. 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
  50. 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
  51. 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
  52. 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
  53. 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
  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