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Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Graham, Alastair G C; Smith, James A; Larter, Robert D; Gohl, Karsten (2013): Sedimentology of two cores from the Mid-shelf eastern Amundsen Sea Embayment. PANGAEA, https://doi.org/10.1594/PANGAEA.779863, Supplement to: Klages, JP et al. (2013): First geomorphological record and glacial history of an inter-ice stream ridge on the West Antarctic continental shelf. Quaternary Science Reviews, 61, 47-61, https://doi.org/10.1016/j.quascirev.2012.11.007

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Abstract:
Inter-ice stream areas cover significant portions of Antarctica's formerly glaciated shelves, but have been largely neglected in past geological studies because of overprinting by iceberg scours. Here, we present results of the first detailed survey of an inter-ice stream ridge from the West Antarctic continental shelf. Well-preserved sub- and proglacial bedforms on the seafloor of the ridge in the eastern Amundsen Sea Embayment (ASE) provide new insights into the flow dynamics of this sector of the West Antarctic Ice Sheet (WAIS) during the Last Glacial cycle. Multibeam swath bathymetry and PARASOUND acoustic sub-bottom profiler data acquired across a mid-shelf bank, between the troughs of the Pine Island-Thwaites (PITPIS) and Cosgrove palaeo-ice streams (COPIS), reveal large-scale ribbed moraines, hill-hole pairs, terminal moraines, and crevasse-squeeze ridges. Together, these features form an assemblage of landforms that is entirely different from that in the adjacent ice-stream troughs, and appears to be unique in the context of previous studies of Antarctic seafloor geomorphology. From this assemblage, the history of ice flow and retreat from the inter-ice stream ridge is reconstructed. The bedforms indicate that ice flow was significantly slower on the inter-ice stream ridge than in the neighbouring troughs. While terminal moraines record at least two re-advances or stillstands of the ice sheet during deglaciation, an extensive field of crevasse-squeeze ridges indicates ice stagnation subsequent to re-advancing ice, which deposited the field of terminal moraines in the NE. The presented data suggest that the ice flow behaviour on the inter-ice stream ridge was substantially different from that in the adjacent troughs. However, newly obtained radiocarbon ages on two sediment cores recovered from the inter-ice stream ridge suggest a similar timing in the deglaciation of both areas. This information closes an important gap in the understanding of past WAIS behaviour in the eastern ASE. Our newly-documented bedforms will also serve as an important diagnostic tool in future studies for interpreting ice-sheet histories in similar inter-ice stream areas.
Coverage:
Median Latitude: -72.769874 * Median Longitude: -105.062768 * South-bound Latitude: -72.784160 * West-bound Longitude: -105.104830 * North-bound Latitude: -72.754160 * East-bound Longitude: -105.016500
Date/Time Start: 2010-03-20T02:50:00 * Date/Time End: 2010-03-20T04:01:00
Event(s):
PS75/233-1 * Latitude: -72.754160 * Longitude: -105.016500 * Date/Time: 2010-03-20T02:50:00 * Elevation: -555.0 m * Penetration: 2.9 m * Recovery: 2.34 m * Location: N Burke Island (moraine on drumlin) * Campaign: ANT-XXVI/3 (PS75) * Basis: Polarstern * Method/Device: Gravity corer (Kiel type) (SL) * Comment: 3 core sections: 0-0.34, 0.34-1.34, 1.34-2.34 m, 1 sample from core catcher; soft till at core base
PS75/234-1 * Latitude: -72.784160 * Longitude: -105.104830 * Date/Time: 2010-03-20T04:01:00 * Elevation: -583.0 m * Penetration: 1.5 m * Recovery: 0.85 m * Location: N Burke Island (flank of drumlin) * Campaign: ANT-XXVI/3 (PS75) * Basis: Polarstern * Method/Device: Gravity corer (Kiel type) (SL) * Comment: 1 core section: 0-0.85 m, 1 core top sample with suspension and sediment (in kautex bottle); stiff till at core base; shear strength of core catcher sediment: 74 kPa
Size:
21 datasets

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Datasets listed in this publication series

  1. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Age determination of sediment core PS75/233-1 (Table 1a). https://doi.org/10.1594/PANGAEA.779860
  2. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Biogenic opal of sediment core PS75/233-1. https://doi.org/10.1594/PANGAEA.779830
  3. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Clay mineral content of sediment core PS75/233-1. https://doi.org/10.1594/PANGAEA.779834
  4. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Grain size composition of sediment core PS75/233-1. https://doi.org/10.1594/PANGAEA.779836
  5. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Shear strength measurements on sediment core PS75/233-1. https://doi.org/10.1594/PANGAEA.779844
  6. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Magnetic susceptibility of sediment core PS75/233-1. https://doi.org/10.1594/PANGAEA.779838
  7. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Total organic carbon of sediment core PS75/233-1. https://doi.org/10.1594/PANGAEA.779846
  8. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Water content of sediment core PS75/233-1. https://doi.org/10.1594/PANGAEA.779851
  9. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Wet bulk density of sediment core PS75/233-1. https://doi.org/10.1594/PANGAEA.779856
  10. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Wet bulk density of sediment core PS75/233-1. https://doi.org/10.1594/PANGAEA.779858
  11. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Age determination of sediment core PS75/234-1 (Table 1b). https://doi.org/10.1594/PANGAEA.779861
  12. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Biogenic opal of sediment core PS75/234-1. https://doi.org/10.1594/PANGAEA.779833
  13. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Clay mineral content of sediment core PS75/234-1. https://doi.org/10.1594/PANGAEA.779835
  14. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Grain size composition of sediment core PS75/234-1. https://doi.org/10.1594/PANGAEA.779837
  15. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Shear strength measurements on sediment core PS75/234-1. https://doi.org/10.1594/PANGAEA.779845
  16. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Magnetic susceptibility of sediment core PS75/234-1. https://doi.org/10.1594/PANGAEA.779839
  17. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Total organic carbon of sediment core PS75/234-1. https://doi.org/10.1594/PANGAEA.779847
  18. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): P-wave velocity of sediment core PS75/234-1. https://doi.org/10.1594/PANGAEA.779843
  19. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Water content of sediment core PS75/234-1. https://doi.org/10.1594/PANGAEA.779852
  20. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Wet bulk density of sediment core PS75/234-1. https://doi.org/10.1594/PANGAEA.779857
  21. Klages, JP; Kuhn, G; Hillenbrand, C-D et al. (2013): Wet bulk density of sediment core PS75/234-1. https://doi.org/10.1594/PANGAEA.779859