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Hillenbrand, Claus-Dieter; Larter, Robert D; Dowdeswell, Julian A; Ehrmann, Werner; Cofaigh, Colm Ó; Benetti, Sara; Graham, Alastair G C; Grobe, Hannes (2010): Sedimentology of the southern Bellingshausen Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.742532, Supplement to: Hillenbrand, C-D et al. (2010): The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary. Quaternary Science Reviews, 29(19-20), 2741-2763, https://doi.org/10.1016/j.quascirev.2010.06.028

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Abstract:
A major trough ('Belgica Trough') eroded by a palaeo-ice stream crosses the continental shelf of the southern Bellingshausen Sea (West Antarctica) and is associated with a trough mouth fan ('Belgica TMF') on the adjacent continental slope. Previous marine geophysical and geological studies investigated the bathymetry and geomorphology of Belgica Trough and Belgica TMF, erosional and depositional processes associated with bedform formation, and the temporal and spatial changes in clay mineral provenance of subglacial and glaciomarine sediments.
Here, we present multi-proxy data from sediment cores recovered from the shelf and uppermost slope in the southern Bellingshausen Sea and reconstruct the ice-sheet history since the last glacial maximum (LGM) in this poorly studied area of West Antarctica. We combined new data (physical properties, sedimentary structures, geochemical and grain-size data) with published data (shear strength, clay mineral assemblages) to refine a previous facies classification for the sediments. The multi-proxy approach allowed us to distinguish four main facies types and to assign them to the following depositional settings: 1) subglacial, 2) proximal grounding-line, 3) distal sub-ice shelf/subsea ice, and 4) seasonal open-marine. In the seasonal open-marine facies we found evidence for episodic current-induced winnowing of near-seabed sediments on the middle to outer shelf and at the uppermost slope during the late Holocene.
In addition, we obtained data on excess 210Pb activity at three core sites and 44 AMS 14C dates from the acid-insoluble fraction of organic matter (AIO) and calcareous (micro-)fossils, respectively, at 12 sites. These chronological data enabled us to reconstruct, for the first time, the timing of the last advance and retreat of the West Antarctic Ice Sheet (WAIS) and the Antarctic Peninsula Ice Sheet (APIS) in the southern Bellingshausen Sea. We used the down-core variability in sediment provenance inferred from clay mineral changes to identify the most reliable AIO 14C ages for ice-sheet retreat. The palaeo-ice stream advanced through Belgica Trough after ~36.0 corrected 14C ka before present (B.P.). It retreated from the outer shelf at ~25.5 ka B.P., the middle shelf at ~19.8 ka B.P., the inner shelf in Eltanin Bay at ~12.3 ka B.P., and the inner shelf in Ronne Entrance at ~6.3 ka B.P.. The retreat of the WAIS and APIS occurred slowly and stepwise, and may still be in progress. This dynamical ice-sheet behaviour has to be taken into account for the interpretation of recent and the prediction of future mass-balance changes in the study area. The glacial history of the southern Bellingshausen Sea is unique when compared to other regions in West Antarctica, but some open questions regarding its chronology need to be addressed by future work.
Coverage:
Median Latitude: -71.458083 * Median Longitude: -83.125573 * South-bound Latitude: -73.401667 * West-bound Longitude: -89.356667 * North-bound Latitude: -70.005000 * East-bound Longitude: -72.575000
Date/Time Start: 1994-02-05T01:11:00 * Date/Time End: 2004-02-05T00:00:00
Event(s):
JR104-BC355 (BC355 CORE_NO 355) * Latitude: -70.005000 * Longitude: -84.890000 * Date/Time: 2004-01-30T00:00:00 * Elevation: -788.0 m * Recovery: 0.02 m * Location: Bellingshausen Sea, inbetween gullies at uppermost slope on TMF * Campaign: JR20040123 (JR104) * Basis: James Clark Ross * Device: Box corer (BC) * Comment: bulk sediment sample (in bag)
JR104-BC356 (BC356 CORE_NO 356) * Latitude: -71.768300 * Longitude: -80.110000 * Date/Time: 2004-01-31T00:00:00 * Elevation: -565.0 m * Recovery: 0.11 m * Location: Bellingshausen Sea, till sheet on shelf N of Smyley Island * Campaign: JR20040123 (JR104) * Basis: James Clark Ross * Device: Box corer (BC) * Comment: surface sediment (11.5x22.0x1 cm), bulk sediment (rest of recovered sediment volume), 2 dropstones with serpulid worms and bryozoa
JR104-BC361 (BC361 CORE_NO 361) * Latitude: -71.993300 * Longitude: -76.553300 * Date/Time: 2004-02-01T00:00:00 * Elevation: -633.0 m * Recovery: 0.37 m * Location: Bellingshausen Sea, till sheet on N side of Ronne Entrance Trough * Campaign: JR20040123 (JR104) * Basis: James Clark Ross * Device: Box corer (BC) * Comment: surface sediment (c. 10x10x1 cm), 1 core X (0-10.5 cmbsf), 1 core Y (0-23 cmbsf)
Size:
20 datasets

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Datasets listed in this publication series

  1. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC352. https://doi.org/10.1594/PANGAEA.742497
  2. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC357. https://doi.org/10.1594/PANGAEA.742508
  3. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC358. https://doi.org/10.1594/PANGAEA.742498
  4. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC359. https://doi.org/10.1594/PANGAEA.742499
  5. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC360. https://doi.org/10.1594/PANGAEA.742500
  6. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC362. https://doi.org/10.1594/PANGAEA.742501
  7. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC365. https://doi.org/10.1594/PANGAEA.742502
  8. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC366. https://doi.org/10.1594/PANGAEA.742509
  9. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC368. https://doi.org/10.1594/PANGAEA.742510
  10. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC370. https://doi.org/10.1594/PANGAEA.742503
  11. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC371. https://doi.org/10.1594/PANGAEA.742504
  12. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC372. https://doi.org/10.1594/PANGAEA.742511
  13. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core JR104-GC374. https://doi.org/10.1594/PANGAEA.742512
  14. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core PS2533-2. https://doi.org/10.1594/PANGAEA.742524
  15. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core PS2542-2. https://doi.org/10.1594/PANGAEA.742525
  16. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 2) Physical properties, grain size distribution and contents of carbonate and organic carbon of sediment core PS2543-1. https://doi.org/10.1594/PANGAEA.742527
  17. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 4) Lithological composition of sediment surface samples from the continental shelf and the uppermost continental slope in the southern Bellingshausen Sea. https://doi.org/10.1594/PANGAEA.742529
  18. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 5) Oxygen and carbon isotope composition of Neogloboquadrina pachyderma sin. in near-surface sediments. https://doi.org/10.1594/PANGAEA.742530
  19. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Figure 6) Down-core 210Pb, 226Ra and excess 210Pb profiles of near-surface sediments. https://doi.org/10.1594/PANGAEA.742531
  20. Hillenbrand, C-D; Larter, RD; Dowdeswell, JA et al. (2010): (Table 1) Uncorrected and corrected AMS 14C dates from sediment cores of the Bellingshausen Sea. https://doi.org/10.1594/PANGAEA.742494