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Graham, Alastair G C; Larter, Robert D; Gohl, Karsten; Hillenbrand, Claus-Dieter; Smith, James A; Kuhn, Gerhard (2009): Documentation of sediment cores. PANGAEA, https://doi.org/10.1594/PANGAEA.724192

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Abstract:
The presence of a complex bedform arrangement on the sea-floor of the continental shelf in the western Amundsen Sea Embayment, West Antarctica, indicates a multi-temporal record of flow related to the activity of one or more ice streams in the past. Mapping and division of the bedforms into distinct landform assemblages reveals their time-transgressive history, which implies that bedforms can neither be considered part of a single down-flow continuum nor a direct proxy for palaeo-ice velocity, as suggested previously. A main control on the bedform imprint is the geology of the shelf, which is divided broadly between rough bedrock on the inner shelf, and smooth, dipping sedimentary strata on the mid-to-outer shelf. Inner shelf bedform variability is well preserved, revealing information about local, complex basal-ice conditions, meltwater flow, and ice dynamics over time. These details, which are not apparent at the scale of regional morphological studies, indicate that past ice streams flowed across the entire shelf, at times, and often had onset zones that lay within the interior of the Antarctic Ice Sheet today. In contrast, highly elongated subglacial bedforms on sedimentary strata of the middle to outer shelf represent a timeslice snapshot of the last activity of ice-stream flow, and may be a truer representation of fast palaeo-ice flow in these locations. A revised model for ice streams on the shelf captures complicated multi-temporal bedform patterns associated with an Antarctic palaeo-ice stream for the first time, and confirms a strong substrate control on this ice stream system that drained the West Antarctic Ice Sheet during the Late Quaternary.
Related to:
Graham, Alastair G C; Larter, Robert D; Gohl, Karsten; Hillenbrand, Claus-Dieter; Smith, James A; Kuhn, Gerhard (2009): Bedform signature of a West Antarctic palaeo-ice stream reveals a multi-temporal record of flow and substrate control. Quaternary Science Reviews, 28(25-26), 2774-279, https://doi.org/10.1016/j.quascirev.2009.07.003
Coverage:
Median Latitude: -73.461520 * Median Longitude: -115.001480 * South-bound Latitude: -74.301700 * West-bound Longitude: -118.486200 * North-bound Latitude: -72.764300 * East-bound Longitude: -110.265400
Date/Time Start: 2006-03-01T18:01:00 * Date/Time End: 2006-03-10T22:51:00
Event(s):
PS69/259-1 * Latitude: -74.301700 * Longitude: -110.265400 * Date/Time: 2006-03-01T18:01:00 * Elevation: -258.0 m * Recovery: 3.06 m * Campaign: ANT-XXIII/4 (PS69) * Basis: Polarstern * Device: Gravity corer (GC) * Comment: 3 core sections: 0-1.06, 1.06-2.06, 2.06-3.06 m (CC); core top lost
PS69/265-3 * Latitude: -73.669000 * Longitude: -113.038400 * Date/Time: 2006-03-03T20:06:00 * Elevation: -692.0 m * Recovery: 1.29 m * Campaign: ANT-XXIII/4 (PS69) * Basis: Polarstern * Device: Gravity corer (GC) * Comment: 2 cores sections: 0-0.29, 0.29-1.29 m; fallen over?
PS69/266-1 * Latitude: -73.542200 * Longitude: -113.741300 * Date/Time: 2006-03-03T23:49:00 * Elevation: -745.0 m * Recovery: 3.46 m * Campaign: ANT-XXIII/4 (PS69) * Basis: Polarstern * Device: Gravity corer (GC) * Comment: 4 core sections: 0-0.46, 0.46-1.46, 1.46-2.46, 2.46-3.46 m
Size:
15 datasets

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Datasets listed in this publication series

  1. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/259-1. https://doi.org/10.1594/PANGAEA.499745
  2. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/265-3. https://doi.org/10.1594/PANGAEA.499831
  3. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/266-1. https://doi.org/10.1594/PANGAEA.499746
  4. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/267-1. https://doi.org/10.1594/PANGAEA.499747
  5. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/267-2. https://doi.org/10.1594/PANGAEA.499832
  6. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/269-1. https://doi.org/10.1594/PANGAEA.499748
  7. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/269-2. https://doi.org/10.1594/PANGAEA.499833
  8. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/272-2. https://doi.org/10.1594/PANGAEA.499834
  9. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/272-3. https://doi.org/10.1594/PANGAEA.499749
  10. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/275-2. https://doi.org/10.1594/PANGAEA.499751
  11. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/280-1. https://doi.org/10.1594/PANGAEA.499836
  12. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/283-5. https://doi.org/10.1594/PANGAEA.499752
  13. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/283-6. https://doi.org/10.1594/PANGAEA.499837
  14. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/284-1. https://doi.org/10.1594/PANGAEA.499838
  15. Graham, AGC; Larter, RD; Gohl, K et al. (2006): Documentation of sediment core PS69/284-2. https://doi.org/10.1594/PANGAEA.499753