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Geodynamic evolution of the Proterozoic Mount Isa terrain

M. G. O’Dea, G. S. Lister, T. Maccready, P. G. Betts, N. H. S. Oliver, K. S. Pound, W. Huang, R. K. Valenta, N. H. S. Oliver and R. K. Valenta
Geological Society, London, Special Publications, 121, 99-122, 1 January 1997, https://doi.org/10.1144/GSL.SP.1997.121.01.05
M. G. O’Dea
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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G. S. Lister
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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T. Maccready
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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P. G. Betts
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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N. H. S. Oliver
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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K. S. Pound
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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W. Huang
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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R. K. Valenta
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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N. H. S. Oliver
1School of Applied Geology, Curtin University GPO Box U 1987, Perth, WA 6001, Australia
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R. K. Valenta
2MIM Exploration Pty Ltd GPO Box 1042, Brisbane, Qld 4001, Australia
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Abstract

The Proterozoic Mount Isa terrain records the effects of four periods of intraplate tectonism. The c. 1870 Ma Barramundi Orogeny was characterized by a massive felsic magmatic event, and global correlations suggest a physical link between Australia and Laurentia at this time. Thereafter, the terrain underwent an extensional history spanning 200 Ma involving repeated episodes of rifting, post-rift subsidence and associated depositional and magmatic phases. This protracted rifting history resulted in a cumulative stratigraphic thickness of up to 25 km above attenuated continental crust. Rifting was interrupted prior to the formation of ocean crust by the compressional Isan Orogeny (1590–1500 Ma). The Isan Orogeny was synchronous with low-pressure high-temperature metamorphism and widespread metasomatism. In the waning stages of shortening, the Mount Isa terrain evolved into a wrench system characterized by an extensive network of strike-slip faults. The current level of exposure in this terrain provides spectacular examples of superimposed rifts, basin inversion, and wrench geometries developed at middle to upper crustal levels.

  • © The Geological Society 1997

Abstract

The Proterozoic Mount Isa terrain records the effects of four periods of intraplate tectonism. The c. 1870 Ma Barramundi Orogeny was characterized by a massive felsic magmatic event, and global correlations suggest a physical link between Australia and Laurentia at this time. Thereafter, the terrain underwent an extensional history spanning 200 Ma involving repeated episodes of rifting, post-rift subsidence and associated depositional and magmatic phases. This protracted rifting history resulted in a cumulative stratigraphic thickness of up to 25 km above attenuated continental crust. Rifting was interrupted prior to the formation of ocean crust by the compressional Isan Orogeny (1590–1500 Ma). The Isan Orogeny was synchronous with low-pressure high-temperature metamorphism and widespread metasomatism. In the waning stages of shortening, the Mount Isa terrain evolved into a wrench system characterized by an extensive network of strike-slip faults. The current level of exposure in this terrain provides spectacular examples of superimposed rifts, basin inversion, and wrench geometries developed at middle to upper crustal levels.

  • © The Geological Society 1997

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Geological Society, London, Special Publications: 121 (1)
Geological Society, London, Special Publications
Volume 121
1997
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Geodynamic evolution of the Proterozoic Mount Isa terrain

M. G. O’Dea, G. S. Lister, T. Maccready, P. G. Betts, N. H. S. Oliver, K. S. Pound, W. Huang, R. K. Valenta, N. H. S. Oliver and R. K. Valenta
Geological Society, London, Special Publications, 121, 99-122, 1 January 1997, https://doi.org/10.1144/GSL.SP.1997.121.01.05
M. G. O’Dea
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
  • Find this author on Google Scholar
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G. S. Lister
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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  • Search for this author on this site
T. Maccready
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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P. G. Betts
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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N. H. S. Oliver
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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  • Search for this author on this site
K. S. Pound
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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W. Huang
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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R. K. Valenta
Australian Geodynamics Cooperative Research Centre, VIEPS, Department of Earth Sciences, Monash University Clayton, Vic 3168, Australia
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  • Search for this author on this site
N. H. S. Oliver
1School of Applied Geology, Curtin University GPO Box U 1987, Perth, WA 6001, Australia
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  • Search for this author on this site
R. K. Valenta
2MIM Exploration Pty Ltd GPO Box 1042, Brisbane, Qld 4001, Australia
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  • Search for this author on this site

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Geodynamic evolution of the Proterozoic Mount Isa terrain

M. G. O’Dea, G. S. Lister, T. Maccready, P. G. Betts, N. H. S. Oliver, K. S. Pound, W. Huang, R. K. Valenta, N. H. S. Oliver and R. K. Valenta
Geological Society, London, Special Publications, 121, 99-122, 1 January 1997, https://doi.org/10.1144/GSL.SP.1997.121.01.05
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