Data

Prydz Channel Fan and the History of Extreme Ice Advances in Prydz Bay

Australian Ocean Data Network
O'Brien, P.E. ; Cooper, A.K. ; Florindo, F. ; Handwerger, D. ; Lavelle, M.
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/47356&rft.title=Prydz Channel Fan and the History of Extreme Ice Advances in Prydz Bay&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/47356&rft.description=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 in ODP Site 1167 indicates that the bulk of the trough mouth fan was deposited prior to the Brunhes-Matuyama Boundary (780 ka) with as few as 3 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 Milanckovich cycles and the response time of the ice sheet.Maintenance and Update Frequency: unknownStatement: Unknown&rft.creator=O'Brien, P.E. &rft.creator=Cooper, A.K. &rft.creator=Florindo, F. &rft.creator=Handwerger, D. &rft.creator=Lavelle, M. &rft.date=2004&rft.coverage=westlimit=66; southlimit=-70.0; eastlimit=80; northlimit=-65.0&rft.coverage=westlimit=66; southlimit=-70.0; eastlimit=80; northlimit=-65.0&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=geoscientificInformation&rft_subject=External Publication&rft_subject=Monograph Contribution&rft_subject=seismic sections&rft_subject=palaeoclimatology&rft_subject=continental margins&rft_subject=underwater drilling&rft_subject=marine&rft_subject=AQ&rft_subject=EARTH SCIENCES&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
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Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

Creative Commons Attribution 4.0 International Licence

CC-BY

4.0

http://creativecommons.org/licenses/

WWW:LINK-1.0-http--link

Australian Government Security ClassificationSystem

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WWW:LINK-1.0-http--link

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Contact Information

clientservices@ga.gov.au

Brief description

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 in ODP Site 1167 indicates that the bulk of the trough mouth fan was deposited prior to the Brunhes-Matuyama Boundary (780 ka) with as few as 3 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 Milanckovich cycles and the response time of the ice sheet.

Lineage

Maintenance and Update Frequency: unknown
Statement: Unknown

Issued: 2004

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80,-65 80,-70 66,-70 66,-65 80,-65

73,-67.5

text: westlimit=66; southlimit=-70.0; eastlimit=80; northlimit=-65.0

Subjects
AQ | Earth Sciences | External Publication | Monograph Contribution | Published_External | continental margins | geoscientificInformation | marine | palaeoclimatology | seismic sections | underwater drilling |

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Other Information
View the online article in Scientific Results, Vol. 188, (Related Product)

uri : http://www-odp.tamu.edu/publications/188_SR/016/016.htm

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