JSON format icon JSON RDF format icon RDF ISO19115-3 XML

Sedimenary Processes in the Wilkes Land Margin: A Record of Cenozoic East Antarctic Ice Sheet Evolution

ARCHIVED

Created 20/01/2025

Updated 20/01/2025

JSON format icon JSON RDF format icon RDF ISO19115-3 XML

Multichannel seismic data collected off Wilkes Land (East Antarctica) reveal four main units that represent distinct phases in the evolution of the Cenozoic depositional environment. A Cretaceous synrift succession is overlain by hemipelagic and distal terrigenous sequences deposited during Phase 1. Sediment ridges and debris-flow deposits mark the transition to Phase 2. Unit 3 records the maximum sediment input from the continent and is characterized by the predominance of turbidite deposits. During Phase 4 the sediment supply from the continental margin was reduced, and draping and filling were the dominant processes on the continental rise. Unit 4 also contains the deposits of sediment wave fields and asymmetric channel-levee systems. These four units are a response to the Cenozoic evolution of the East Antarctic Ice Sheet. During Phase 1, small ice caps were formed in the innermost continental areas. The ice volume increased under temperate glacial regimes during Phases 2 and 3, when large volumes of melt-water production led to high sediment discharge to the continental rise. Change to a polar regime occurred through Phase 4, when a thick prograding wedge developed on the continental shelf and slope and the sediment transport to the rise diminished, producing general starvation conditions.

Files and APIs

Tags

Additional Info

Field Value
Title Sedimenary Processes in the Wilkes Land Margin: A Record of Cenozoic East Antarctic Ice Sheet Evolution
Language eng
Licence Not Specified
Landing Page https://devweb.dga.links.com.au/data/dataset/1288b809-2d34-4a65-800d-cd333c2332e9
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
Data Portal Data.gov.au