Re-assessing the Upper Permian Stratigraphic Succession of the Northern Sydney Basin, Australia, by CA-IDTIMS

High precision Chemical abrasion-isotope dilution thermal ionisation mass spectrometry (CA-IDTIMS) U-Pb zircon results from tuff marker beds that are interstratified within the Upper Permian deposits of the northern Sydney Basin add constraints on the timing of sediment deposition, and afford a bett...

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Bibliographic Details
Published in:Geosciences (Basel) 2020-11, Vol.10 (11), p.474
Main Authors: Maravelis, Angelos G., Breckenridge, Jake, Ruming, Kevin, Holmes, Erin, Amelin, Yuri, Collins, William J.
Format: Article
Language:English
Subjects:
Abrasion
Australia
Basins
CA-IDTIMS zircon dating
Coal
Constraints
Correlation
Deposition
Dilution
Earth science
Geochronology
Geochronometry
Isotope dilution
Isotopes
Lithic
Mass spectrometry
Mass spectroscopy
Permian
Sedimentary rocks
Sediments
Stratigraphic correlation
Stratigraphy
Sydney Basin
Tuff
Zircon
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Summary:High precision Chemical abrasion-isotope dilution thermal ionisation mass spectrometry (CA-IDTIMS) U-Pb zircon results from tuff marker beds that are interstratified within the Upper Permian deposits of the northern Sydney Basin add constraints on the timing of sediment deposition, and afford a better understanding of the regional stratigraphy. The results indicate a magmatic influence during the deposition of the sediments, with episodic events spanning at least from 255.65 ± 0.08 to 255.08 ± 0.09 Ma. The zircon data suggest that the studied sedimentary rocks and tuffs have accumulated simultaneously over a short time interval, which contrasts with current stratigraphic models that suggest a much greater period of deposition and stratigraphic thickness. Therefore, an updated stratigraphic correlation of the basin is suggested, which combines the presently defined Lambton, Adamstown, and Boolaroo sub-groups into a single Lambton sub-group. This updated correlation framework is stratigraphically and geochronologically constrained and provides a more precise exploration model for the northern Sydney Basin. This case study highlights the valuable contribution of the CA-IDTIMS method in intrabasinal correlations of sedimentary successions, when integrated with a robust sedimentological framework, to minimize the stratigraphic uncertainties.
ISSN:2076-3263
2076-3263
DOI:10.3390/geosciences10110474