Late Neogene Ice Drainage Changes in Prydz Bay, East Antarctica and the Interaction of Antarctic Ice Sheet Evolution and Climate

During the late Neogene, the Lambert Glacier-Amery Ice Shelf drainage system flowed across Prydz Bay and showed several changes in flow pattern. In the Early Pliocene, the Lambert Glacier ice stream reached the shelf edge and built a trough mouth fan on the upper continental slope. This was associated with an increase in ice discharge from the Princess Elizabeth Land coast into Prydz Bay. The trough mouth fan consists mostly of debris flow deposits derived from the melting out of subglacial debris at the grounding line at the continental shelf edge. The composition of debris changes at around 1.1 Ma BP from material derived from erosion of the Lambert Graben and Prydz Bay Basin to mostly basement derived material. This probably results from a reduction in the depth of erosion and hence the volume of ice in the system. In the trough mouth fan, debris flow intervals are separated by thin mudstone horizons deposited when the ice had retreated from the shelf edge. Age control in an Ocean Drilling Program hole indicates that most of the trough mouth fan was deposited prior to the Brunhes Matuyama Boundary (780 ka BP). This stratigraphy indicates that extreme ice advances in Prydz Bay were rare after the mid Pleistocene, and that ice discharge from Princess Elizabeth Land became more dominant than the Lambert Glacier ice in shelf grounding episodes, since the mid Pleistocene. Mechanisms that might have produced this change are extreme inner shelf erosion and/or decreasing ice accumulation in the interior of East Antarctica. We interpret this pattern as reflecting the increasing elevation of coastal ice through time and the increasing continentality of the interior of the East Antarctic Ice Sheet. The mid Pleistocene change to 100 ka climatic and sea level cycles may also have affected the critical relationship between ice dynamics and the symmetry or asymmetry of the interglacial/glacial climate cycle duration.

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Date (Publication)
2007-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/63892

Citation identifier
Digital Object Identifier/http://dx.doi.org/10.1016/j.palaeo.2006.09.002

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Role Organisation / Individual Name Details
Author

O'Brien, P.E.

 1
Author

Goodwin, I.

 2
Author

Forsber, C.F.

 3
Author

Cooper, A.K.

 4
Author

Whitehead, J.

 5
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245

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EGD
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Commonwealth of Australia (Geoscience Australia)
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Commonwealth of Australia (Geoscience Australia)

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  • Geoscientific information

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E
W


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Unknown
Keywords

  • External Publication

  • Scientific Journal Paper

Theme

  • Antarctic data

Theme

  • sedimentary basins

Theme

  • bathymetry

Theme

  • marine

Theme

  • geomorphology

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  • AQ

Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

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  • Published_External

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Creative Commons Attribution 4.0 International Licence

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CC-BY

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4.0

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http://creativecommons.org/licenses/

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Australian Government Security ClassificationSystem

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2018-11-01T00:00:00
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Unclassified
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English
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UTF8

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Commonwealth of Australia (Geoscience Australia)

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Non geographic dataset
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Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

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Unclassified

Metadata

Metadata identifier
urn:uuid/a05f7892-ed7c-7506-e044-00144fdd4fa6

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GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
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Commonwealth of Australia (Geoscience Australia)

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Non geographic dataset
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nonGeographicDataset

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Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/63892

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/a05f7892-ed7c-7506-e044-00144fdd4fa6

Date info (Revision)
2018-04-22T08:50:54
Date info (Creation)
2005-11-04T00:00:00

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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N
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E
W


Keywords

Antarctic data bathymetry geomorphology marine sedimentary basins

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