Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

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

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

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 * 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 * 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

Download Data

Download ZIP file containing all datasets as tab-delimited text (use the following character encoding: )

Datasets listed in this Collection

  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): Age determination of sediment core PS75/234-1 (Table 1b). https://doi.org/10.1594/PANGAEA.779861
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  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