Authors / CoAuthors
Korsch, R.J. | Doublier, M.P. | Brown, D.D. | Simpson, J.M. | Cross, A.J. | Costelloe, R.D. | Jiang, W.
Abstract
Interpretation of 2014–2015 deep crustal seismic reflection and magnetotelluric data has revised the architecture and geodynamic framework of western Queensland, with implications for the assembly and dispersal of the supercontinents Nuna, Rodinia and Gondwana. In the Mount Isa Province, crustal-scale boundaries of the Leichhardt River Domain, Kalkadoon-Leichhardt Domain and Eastern Subprovince are mapped in the third dimension. The Leichhardt River and Kalkadoon-Leichhardt domains have similar Nd isotopic T 2DM model ages to provinces to the west, indicating they were part of ancestral North Australian Craton (NAC); the Eastern Subprovince is a separate terrane, with the Pilgrim Fault a collisional suture. The Gidyea Suture Zone separates the Mount Isa Province from the subsurface Numil Seismic Province. To the east, the west-dipping Yappar Fault separates east-dipping structures in the west from west-dipping structures in the east, forming a classic doubly vergent orogen within the upper plate of a convergent margin. The northwestern boundary of the Bernfels Seismic Province, the Kynuna Fault, truncates the Gidyea Suture Zone, implying this seismic province was welded to the NAC prior to initial deposition of the Etheridge Province. The Cork Fault truncates the north-south grain of the Mount Isa Province; the easternmost part of the NAC has been excised, presumably during breakup of Nuna. The subsurface Brighton Downs Seismic Province, formerly part of the northern Thomson Orogen, is a discrete seismic province, located between the NAC and the Thomson Orogen, and welded to the NAC during the accretion of Rodinia. Basement to the Thomson Orogen is a collage of microplates, accreted to the Brighton Downs Seismic Province during the assembly of Gondwana. By 530 Ma, eastern Australia faced an open Pacific Ocean, with the Thomson Orogen in a backarc setting. Thus, northeastern Australia contains a record of repeated continental accretion and breakup over at least three supercontinent cycles. <b>Citation: </b>Russell J. Korsch, Michael P. Doublier, Dominic D. Brown, Janelle M. Simpson, Andrew J. Cross, Ross D. Costelloe, Wenping Jiang, Crustal architecture and tectonic development of western Queensland, Australia, based on deep seismic reflection profiling: Implications for Proterozoic continental assembly and dispersal, <i>Tectonophysics</i>, Volume 878, 2024, 230302, ISSN 0040-1951, https://doi.org/10.1016/j.tecto.2024.230302.
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document
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148849
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Keywords
- ( Project )
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- EFTF – Exploring for the Future
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- seismic interpretation
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- Mount Isa
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- Deep Crustal Seismic
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- crustal architecture
- theme.ANZRC Fields of Research.rdf
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- Seismology and seismic explorationStructural geology and tectonics
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- Published_External
Publication Date
2024-08-05T05:30:11
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2023-09-09T04:00:00
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Purpose
This is a journal article describing the crustal architecture of western Queensland based on deep crustal seismic reflection and magnetotelluric data. It integrates new interpretations of deep crustal seismic reflection and magnetotelluric surveys, conducted in 2014-2015, with legacy data.
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Tectonophysics Volume 878 , 10 May 2024 230302
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<div>Interpretation of deep crustal seismic reflection and magnetotelluric surveys, conducted in 2014-2015, has refined the architecture and geodynamic framework of western Queensland, Australia. In the Mount Isa Province, the crustal-scale boundaries of the Leichhardt River Domain, Kalkadoon-Leichhardt Domain and Eastern Subprovince are mapped across the province in the third dimension. In the broader area, several other major crustal boundaries are mapped and their geometries constrained by intergarting teh new seismic interpretations with legacy data.</div>
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[-54.75, -9.2402, 112.92, 159.11]
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