Zircon Inheritance Refines the Cambrian Orogenic Architecture of Southeast Australia

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Article (PDF) Review Report
Published: Aug 11, 2025
DOI: https://doi.org/10.55575/tektonika2025.3.2.98
Keywords:
Inherited Zircon Selwyn Block Tasmanides Tasmania Granite Lachlan Orogen Gondwana Cambrian

Main Article Content

Jacob Mulder
Department of Earth Sciences, University of Adelaide, South Australia, Australia
https://orcid.org/0000-0001-6197-0439
Jacqueline Halpin
Institute for Marine and Antarctic Studies, University of Tasmania, Tasmania, Australia
https://orcid.org/0000-0002-4992-8681
Laura Morrissey
Future Industries Institute, University of South Australia, South Australia, Australia
https://orcid.org/0000-0001-7506-6117
Yousef Zoleikhaei
School of Earth, Atmosphere and Environment, Monash University, Victoria, Australia
https://orcid.org/0000-0002-5572-401X
John Everard
Mineral Resources Tasmania, Tasmania, Australia
Sebastien Meffre
Centre of Excellence in Ore Deposit Research (CODES), University of Tasmania, Tasmania, Australia
https://orcid.org/0000-0003-2741-6076
Mike Hall
School of Earth, Atmosphere and Environment, Monash University, Victoria, Australia
Oliver Nebel
School of Earth, Atmosphere and Environment, Monash University, Victoria, Australia
https://orcid.org/0000-0002-5068-7117
Peter Cawood
School of Earth, Atmosphere and Environment, Monash University, Victoria, Australia
https://orcid.org/0000-0003-1200-3826

Abstract

The Selwyn Block is one of the few accreted terranes identified in the vast Paleozoic Tasmanides of eastern Australia and its incorporation into this orogen marks a first-order event in the tectonic evolution of the Pacific margin of Gondwana. However, the age, composition, and paleogeography of the Selwyn Block are poorly understood because it is almost completely concealed in the middle and lower crust. The prevailing hypothesis suggests the Selwyn Block is a northern continuation of the Proterozoic Western Tasmania Terrane. We test this hypothesis by comparing inherited zircon U-Pb ages (n = 881) from early Paleozoic granitoids intruding the Selwyn Block and the Western Tasmania Terrane. Phase equilibria modelling confirms that typical Western Tasmania Terrane lithologies are melt-fertile and would have contributed inherited zircon grains to local granitoids. The inherited zircon age signature of granitoids in the Western Tasmania Terrane mirrors detrital zircon ages from local Proterozoic strata with age populations at ca. 1430 Ma and 1800--1600 Ma. In comparison, granitoids intruding the Selwyn Block have ca. 600--500 Ma and ca. 1200--900 Ma inherited zircon age populations, likely derived from local Paleozoic strata. Previously published wholerock radiogenic Sr isotopic data and new zircon radiogenic hafnium isotope data also imply distinct melt sources with granitoids intruding the Selwyn Block granitoids having lower initial 87Sr/86Sr and higher initial

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Mulder, J., Halpin, J., Morrissey, L., Zoleikhaei, Y., Everard, J., Meffre, S., Hall, M., Nebel, O., & Cawood, P. (2025). Zircon Inheritance Refines the Cambrian Orogenic Architecture of Southeast Australia. τeκτoniκa, 3(2), 19–39. https://doi.org/10.55575/tektonika2025.3.2.98
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