Prydz channel fan and the history of extreme ice advances in Prydz Bay

P. E. O'Brien, A. K. Cooper, F. Florindo, D. A. Handwerger, M. Lavelle, Sandra Passchier, J. J. Pospichal, P. G. Quilty, C. Richter, K. M. Theissen, J. M. Whitehead

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23 Citations (Scopus)

Abstract

During the late Neogene, the Lambert Glacier-Amery Ice Shelf drainage system flowed across Prydz Bay in an ice stream that reached the shelf edge and built a trough mouth fan on the upper continental slope. The adjacent banks saw mostly subglacial till deposition beneath slower-moving ice. The fan consists mostly of debris flow deposits derived from the melting out of subglacial debris at the grounding line at the continental shelf edge. Thick debris flow intervals are separated by thin mudstone horizons deposited when the ice had retreated from the shelf edge. Age control at Ocean Drilling Program Site 1167 indicates that the bulk of the trough mouth fan was deposited prior to ~780 ka with as few as three debris flow intervals deposited since then. This stratigraphy indicates that extreme advances of the Lambert Glacier-Amery Ice Shelf system ceased during the mid-Pleistocene. Possible causes for this change are progressive over-deepening of the inner shelf, a reduction in maximum ice volumes in the interior of the East Antarctic Ice Sheet caused by temperature change, and a change in the interaction of Milankovich cycles and the response time of the ice sheet.

Original languageEnglish
JournalProceedings of the Ocean Drilling Program: Scientific Results
Volume188
StatePublished - 1 Dec 2004

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shelf break
debris flow
ice shelf
ice
ice sheet
glacier
trough
history
grounding line
ice stream
Ocean Drilling Program
continental slope
mudstone
Neogene
continental shelf
stratigraphy
melting
Pleistocene
temperature

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O'Brien, P. E., Cooper, A. K., Florindo, F., Handwerger, D. A., Lavelle, M., Passchier, S., ... Whitehead, J. M. (2004). Prydz channel fan and the history of extreme ice advances in Prydz Bay. Proceedings of the Ocean Drilling Program: Scientific Results, 188.
O'Brien, P. E. ; Cooper, A. K. ; Florindo, F. ; Handwerger, D. A. ; Lavelle, M. ; Passchier, Sandra ; Pospichal, J. J. ; Quilty, P. G. ; Richter, C. ; Theissen, K. M. ; Whitehead, J. M. / Prydz channel fan and the history of extreme ice advances in Prydz Bay. In: Proceedings of the Ocean Drilling Program: Scientific Results. 2004 ; Vol. 188.
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abstract = "During the late Neogene, the Lambert Glacier-Amery Ice Shelf drainage system flowed across Prydz Bay in an ice stream that reached the shelf edge and built a trough mouth fan on the upper continental slope. The adjacent banks saw mostly subglacial till deposition beneath slower-moving ice. The fan consists mostly of debris flow deposits derived from the melting out of subglacial debris at the grounding line at the continental shelf edge. Thick debris flow intervals are separated by thin mudstone horizons deposited when the ice had retreated from the shelf edge. Age control at Ocean Drilling Program Site 1167 indicates that the bulk of the trough mouth fan was deposited prior to ~780 ka with as few as three debris flow intervals deposited since then. This stratigraphy indicates that extreme advances of the Lambert Glacier-Amery Ice Shelf system ceased during the mid-Pleistocene. Possible causes for this change are progressive over-deepening of the inner shelf, a reduction in maximum ice volumes in the interior of the East Antarctic Ice Sheet caused by temperature change, and a change in the interaction of Milankovich cycles and the response time of the ice sheet.",
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O'Brien, PE, Cooper, AK, Florindo, F, Handwerger, DA, Lavelle, M, Passchier, S, Pospichal, JJ, Quilty, PG, Richter, C, Theissen, KM & Whitehead, JM 2004, 'Prydz channel fan and the history of extreme ice advances in Prydz Bay', Proceedings of the Ocean Drilling Program: Scientific Results, vol. 188.

Prydz channel fan and the history of extreme ice advances in Prydz Bay. / O'Brien, P. E.; Cooper, A. K.; Florindo, F.; Handwerger, D. A.; Lavelle, M.; Passchier, Sandra; Pospichal, J. J.; Quilty, P. G.; Richter, C.; Theissen, K. M.; Whitehead, J. M.

In: Proceedings of the Ocean Drilling Program: Scientific Results, Vol. 188, 01.12.2004.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Cooper, A. K.

AU - Florindo, F.

AU - Handwerger, D. A.

AU - Lavelle, M.

AU - Passchier, Sandra

AU - Pospichal, J. J.

AU - Quilty, P. G.

AU - Richter, C.

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AU - Whitehead, J. M.

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N2 - During the late Neogene, the Lambert Glacier-Amery Ice Shelf drainage system flowed across Prydz Bay in an ice stream that reached the shelf edge and built a trough mouth fan on the upper continental slope. The adjacent banks saw mostly subglacial till deposition beneath slower-moving ice. The fan consists mostly of debris flow deposits derived from the melting out of subglacial debris at the grounding line at the continental shelf edge. Thick debris flow intervals are separated by thin mudstone horizons deposited when the ice had retreated from the shelf edge. Age control at Ocean Drilling Program Site 1167 indicates that the bulk of the trough mouth fan was deposited prior to ~780 ka with as few as three debris flow intervals deposited since then. This stratigraphy indicates that extreme advances of the Lambert Glacier-Amery Ice Shelf system ceased during the mid-Pleistocene. Possible causes for this change are progressive over-deepening of the inner shelf, a reduction in maximum ice volumes in the interior of the East Antarctic Ice Sheet caused by temperature change, and a change in the interaction of Milankovich cycles and the response time of the ice sheet.

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