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Provenance of lower Paleozoic sedimentary rocks in Tasmania and Waratah Bay, southern Victoria: constraints from detrital zircon hafnium isotopes and trace-element geochemistry

Citation

Habib, U and Meffre, S and Berry, R and Belousova, E, Provenance of lower Paleozoic sedimentary rocks in Tasmania and Waratah Bay, southern Victoria: constraints from detrital zircon hafnium isotopes and trace-element geochemistry, Australian Journal of Earth Sciences pp. 1-15. ISSN 1440-0952 (2022) [Refereed Article]

Copyright Statement

© 2022 Geological Society of Australia.

DOI: doi:10.1080/08120099.2023.2137847

Abstract

Nine Paleozoic sedimentary formations from western Tasmania and two from the Lachlan Orogen—one in northeast Tasmania and one in Waratah Bay in Victoria—contain detrital zircons that fall into major U–Pb age clusters at 2.0–1.4, 1.25–0.95 and 0.62–0.49 Ga. The zircon Th/U ratios and rare earth element (REE) patterns suggest a magmatic origin for detrital zircons in all these rock sequences. The REE geochemical signatures on bivariate discrimination diagrams indicate that most of the zircons originated in continental orogenic settings. The oldest group of zircons have a southwest Laurentian signature previously recognised from Proterozoic metasedimentary rocks in Tasmania. The 1.25–0.5 Ga zircons from all the samples have very similar εHfi values. They are not statistically different from those of typical Lachlan Orogen sandstones and resemble those in Rodinia and early Gondwana orogenic belts. The εHfi values of the Cambrian zircons within the Pioneer Sandstone are similar to the Mount Read Volcanics but cannot be distinguished on εHfi values from other sources in East Gondwana. The detrital zircon provenance of the Bear Gully Chert Bed at the base of the Digger Island Marlstone at Waratah Bay includes the west Tasmanian Proterozoic, the East Gondwana margin and the Macquarie Arc. This mixed provenance provides evidence for the late Cambrian docking of VanDieland with East Gondwana.

Item Details

Item Type:Refereed Article
Keywords:zircons, Tasmania
Research Division:Earth Sciences
Research Group:Geology
Research Field:Geochronology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Habib, U (Mr Umer Habib)
UTAS Author:Meffre, S (Professor Sebastien Meffre)
UTAS Author:Berry, R (Associate Professor Ron Berry)
ID Code:154213
Year Published:2022
Funding Support:Australian Research Council (LP160100483)
Web of Science® Times Cited:1
Deposited By:CODES ARC
Deposited On:2022-11-11
Last Modified:2022-12-01
Downloads:0

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