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Bottom currents-controlled sedimentary archives in the southeast Weddell Sea
Huang, X.; Jokat, W.; Gohl, K. (2014). Bottom currents-controlled sedimentary archives in the southeast Weddell Sea, in: Van Rooij, D. et al. (Ed.) Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69: pp. 79-80
In: Van Rooij, D.; Rüggeberg, A. (Ed.) (2014). Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69. Ghent University, Department of Geology and Soil Science/Flanders Marine Institute (VLIZ): Oostende. xviii, 152 pp., more
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, more

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Keywords
Author keywords
    Seismic reflection data; Elongated mounded drift

Authors  Top 
  • Huang, X.
  • Jokat, W.
  • Gohl, K.

Abstract
    Understanding the transport and deposition of sediments brought to the Antarctic continental shelves by major ice streams helps provide constraints on past ice sheet history. In this study, we investigate a series of iceberg erosional and current reworked features along the continental margin of the southern Weddell Sea to understand glacial sedimentation processes from the middle Miocene to the present. The Crary Trough Mouth Fan (CTMF), channel systems, levee deposits, and giant elongate mounded sediment drifts are investigated using high-resolution seismic reflection, sub-bottom profiler and swath bathymetry data. The formation of the giant elongate mounded sediment drifts is ascribed to the semi-enclosed drainage basin, large glacial trough-Crary Trough, paleo-ice streams, plenty of sediment supply, sufficient accommodation space, intensified bottom current (WSBW) and Coriolis effect. The well-developed networks of gullies and channels that we observe cut into the continental shelf edge of Dronning Maud Land were formed during incision by sediment-laden meltwater and associated with sediment gravity flows from the base of ice sheets grounded at the shelf edge. A remarkable increase in mass transport deposits (MTDs) in the late Miocene and middle Pliocene strata is related to collapses of the CTMF, ice advances, overpressure of rapid accumulation of sedimentary as well as the steep topographic gradients.

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