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2023 PESA WEBINAR SERIES: Controls on Shelf-Margin Architecture and Sediment Partitioning in the Hammerhead Shelf-Margin
Tuesday, 21 February, 2023 @ 11:00 am - 12:00 pm (Australia/Perth time)Free – $10.00
Kindly supported by Rock Flow dynamics
This live webinar will take place at:
11am – Perth
12.30pm – Darwin
1pm – Brisbane
1:30pm – Adelaide
2pm – Canberra, Hobart, Melbourne, Sydney
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Tickets are free for members (please log in to see this) and $10 for non members.
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Controls on Shelf-Margin Architecture and Sediment Partitioning in the Hammerhead Shelf-Margin
Presented by John Shepherd (Centre for Energy Geoscience, University of Western Australia)
Understanding the stratigraphic architecture of shelf-margin clinoforms is key to determining both how sediments are transported to deep-water settings and how the interplay of tectonics (subsidence/uplift) and eustasy, with variation in sediment supply, impacts deep-water sand delivery. Within this study clinothems are used to establish quantitative and statistical relationships between the shelf-margin architecture, paleoshoreline processes, and deep-water system types (i.e., quantitative 3D seismic stratigraphy). The Hammerhead shelf-margin prograded during the Late Cretaceous within the Great Australian Bight Basin, along the southern margin of Australia, following break-up with Antarctica. This understudied interval offers a unique opportunity to investigate the controls on the evolution of a shelf margin during the early stages of the post-rift phase.
All available data (i.e., 2D seismic data, 3D seismic data and well data) from the Ceduna Sub-basin has been integrated to investigate the controls on shelf-margin architecture and factors affecting sediment delivery to deep-water. Quantitative analyses involved the measurement of clinoform geometries (e.g., slope length, slope height, shelf-edge progradation and aggradation etc.), which were used to calculate several parameters (e.g., shelf-edge trajectory angle, progradation rate, aggradation rate). The extent of various deep-water systems (e.g. long run-out turbidites) was also measured. It is concluded that lateral variations in sediment supply were the main driver of shelf-margin variability at 3rd order scale.
The Hammerhead shelf-margin provides unique insights in the early stages of drifting between Australia and Antarctica, which has implications for better understanding of early post break-up dynamics. Quantitative results from the Hammerhead shelf-margin can also be used to improve predictability of offshore sediment deposits in other basins globally.