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PESA WA Nov Evening talk: Controls on shelf-margin architecture and sediment partitioning in the Hammerhead shelf-margin

Thursday, 17 November @ 6:00 pm - 8:15 pm (Australia/Perth time)

Free – $50.00

Guest Speaker(s): John Shepherd

John Shepherd commenced his PhD in geology with the Centre for Energy Geoscience at the University of Western Australia in 2020. His research focusses on quantitative 3D seismic stratigraphy of the Hammerhead interval from the Bight Basin, southern Australian margin. Funding for this project includes QSS 2 Consortium research funding, an AAPG GIA award, the PESA Horstman Federal Postgraduate Scholarship (2021), and a UWA Faculty of Science HDR Support Grant. He is also employed part-time as a first-year geology demonstrator at the University of Western Australia. In 2019, John completed his honours (first-class) in geology with a core-based research project on the Bedout Sub-basin, Roebuck Basin, NWS. John is a student member of PESA, ASEG, and AAPG.

Controls on shelf-margin architecture and sediment partitioning in the Hammerhead shelf-margin (Great Australian Bight Basin, southern Australia): Quantitative 3D seismic stratigraphy

John Shepherd, Centre for Energy Geoscience, University of Western Australia

 

Technical Abstract

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.

 

 

Thursday 17th November (for talk starting at 6.45pm)

Cost:

PESA Members:                                $25.00 (Members must Log on to the PESA website to see the member prices)

Non-members:                                 $50.00

PESA Students Members:               Free (registration is essential)

Bookings close 12 noon for venue and catering purposes.  

Details

Date:
Thursday, 17 November
Time:
6:00 pm - 8:15 pm
(Australia/Perth time)
Cost:
Free – $50.00
Event Categories:
  • Venue

    The Shoe
    Shop GSO7 Yagan Square, 376 - 420 Wellington St
    Perth, WA 6000 Australia
    + Google Map
    Phone:
    (08) 6166 7660
    Website:
    https://theshoebar.com.au/

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