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Tectonic, oceanographic, and climatic controls on the Cretaceous-Cenozoic sedimentary record of the Australian-Antarctic Basin

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Sauermilch, I, Whittaker, JM ORCID: 0000-0002-3170-3935, Bijl, PK, Totterdell, JM and Jokat, W 2019 , 'Tectonic, oceanographic, and climatic controls on the Cretaceous-Cenozoic sedimentary record of the Australian-Antarctic Basin' , Journal of Geophysical Research: Solid Earth, vol. 124, no. 8 , 7699–7724 , doi: 10.1029/2018JB016683.

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Abstract

Understanding the patterns and characteristics of sedimentary deposits on the conjugate Australian‐Antarctic margins is critical to reveal the Cretaceous‐Cenozoic tectonic, oceanographic and climatic conditions in the basin. However, unravelling its evolution has remained difficult due to the different seismic stratigraphic interpretations on each margin and sparse drill sites. Here, for the first time, we collate all available seismic reflection profiles on both margins and use newly available offshore drilling data, to develop a consistent seismic stratigraphic framework across the Australian‐Antarctic basins. We find sedimentation patterns similar in structure and thickness, prior to the onset of Antarctic glaciation, enabling the basin‐wide correlation of four major sedimentary units and their depositional history. We interpret that during the warm and humid Late Cretaceous (~83‐65 Ma), large onshore river systems on both Australia and Antarctica resulted in deltaic sediment deposition offshore. We interpret that the onset of clockwise bottom currents during the Early Paleogene (~58‐48 Ma) formed prominent sediment drift deposits along both continental rises. We suggest that these currents strengthened and progressed farther east through the Eocene. Coevally, global cooling (

Item Type: Article
Authors/Creators:Sauermilch, I and Whittaker, JM and Bijl, PK and Totterdell, JM and Jokat, W
Keywords: Eocene, Oligocene, Australia, Antarctica, contourites, seismic
Journal or Publication Title: Journal of Geophysical Research: Solid Earth
Publisher: Wiley-Blackwell Publishing Inc.
ISSN: 2169-9313
DOI / ID Number: 10.1029/2018JB016683
Copyright Information:

Copyright 2019 American Geophysical Union. Further reproduction or electronic distribution is not permitted.

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