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Components of an Antarctic trough-mouth fan: examples from the Crary Fan, Weddell Sea

J. A. Gales, R. D. Larter, P. T. Leat and W. Jokat
Geological Society, London, Memoirs, 46, 377-378, 30 November 2016, https://doi.org/10.1144/M46.82
J. A. Gales
1British Geological Survey, The Lyell Centre, Research Avenue South, Edinburgh EH14 4AP, UK
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R. D. Larter
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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P. T. Leat
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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W. Jokat
3Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, D-27568 Bremerhaven, Germany
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Trough-mouth fans (TMFs) are large depocentres of glacially influenced sediments formed at the mouths of some glacially carved cross-shelf troughs (Vorren et al. 1989). They develop in front of ice streams grounded at, or near to, the shelf edge, which transported large volumes of glacigenic sediment to the outer shelf and upper slope. The main components of TMFs are prograding outer shelf–upper slope strata which are constructed largely of foresets comprising debris-flow units. They are commonly capped by topsets that may include subglacially deposited tills (Fig. 1f). Mass-wasting deposits, gullies and channels may also occur in conjunction with or within the TMFs.

Fig. 1.

Components of the Crary Fan. (a) Oblique view of Crary Fan and Filchner Trough from IBCSO bathymetry. Note the convex-outward shape of the fan. (b) Multibeam-bathymetric image showing slab. Acquisition system Kongsberg EM122. Frequency 12 kHz. Grid-cell size 30 m. (c) Multibeam-bathymetric image showing submarine landslide. Acquisition system as for (b). (d) Seafloor depth profile across submarine landslide scar. Location in (a). VE×28. (e) Sub-bottom profile of debris-flow deposit. Location in (a). Acquisition system Kongsberg TOPAS PS 018. Frequency 18 kHz. Secondary beam frequency …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Components of an Antarctic trough-mouth fan: examples from the Crary Fan, Weddell Sea

J. A. Gales, R. D. Larter, P. T. Leat and W. Jokat
Geological Society, London, Memoirs, 46, 377-378, 30 November 2016, https://doi.org/10.1144/M46.82
J. A. Gales
1British Geological Survey, The Lyell Centre, Research Avenue South, Edinburgh EH14 4AP, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: [email protected]
R. D. Larter
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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P. T. Leat
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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W. Jokat
3Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, D-27568 Bremerhaven, Germany
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Components of an Antarctic trough-mouth fan: examples from the Crary Fan, Weddell Sea

J. A. Gales, R. D. Larter, P. T. Leat and W. Jokat
Geological Society, London, Memoirs, 46, 377-378, 30 November 2016, https://doi.org/10.1144/M46.82
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