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Cambrian reworking of the southern Australian Proterozoic Curnamona Province: constraints from regional shear-zone systems

Rian A. Dutch, Martin Hand and Chris Clark
Journal of the Geological Society, 162, 763-775, 1 September 2005, https://doi.org/10.1144/0016-764904-102
Rian A. Dutch
Continental Evolution Research Group, School of Earth and Environmental Science, University of Adelaide, S.A. 5005, Australia (e-mail: rian.dutch@adelaide.edu.au)
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Martin Hand
Continental Evolution Research Group, School of Earth and Environmental Science, University of Adelaide, S.A. 5005, Australia (e-mail: rian.dutch@adelaide.edu.au)
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Chris Clark
Continental Evolution Research Group, School of Earth and Environmental Science, University of Adelaide, S.A. 5005, Australia (e-mail: rian.dutch@adelaide.edu.au)
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Abstract

Palaeoproterozoic to early Mesoproterozoic metamorphic rocks of the Curnamona Province, southern Australia, are crosscut by a system of regional-scale shear zones that locally dominate the terrain. Combined metamorphic and geochronological data from localities across the southern Curnamona Province indicate that the peak metamorphic shear-zone assemblages formed during the Cambrian (c. 500 Ma) Delamerian Orogeny, and not during the waning stages of the c. 1600 Ma Olarian Orogeny as has been previously asserted. A combination of monazite chemical U–Th–Pb and garnet Sm–Nd geochronology indicates that shear-zone fabrics formed between 497 and 517 Ma. Peak metamorphic conditions obtained from prograde garnet–staurolite–biotite–muscovite–chlorite–quartz assemblages are between 530 and 600 °C at pressures of around 5 kbar. The apparent absence of significant up-pressure prograde paths recorded by the mineral assemblages, together with modest (10–20%) Delamerian shortening, suggests that attainment of burial to depths of around 18 km was largely a function of pre-Delamerian sedimentation over the interval from c. 700 to 530 Ma. The spatial association between the pattern of basement metamorphism and reactivation during the Delamerian Orogeny is interpreted to reflect in part the distribution of pre-Delamerian sedimentation, and highlights the potential importance of pre-orogenic processes such as basin development in controlling the style and pattern of later terrain reactivation and reworking.

  • Curnamona Province
  • Delamerian Orogeny
  • P–T conditions
  • reactivation
  • shear zone
  • © 2005 The Geological Society of London
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Journal of the Geological Society: 162 (5)
Journal of the Geological Society
Volume 162, Issue 5
September 2005
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Cambrian reworking of the southern Australian Proterozoic Curnamona Province: constraints from regional shear-zone systems

Rian A. Dutch, Martin Hand and Chris Clark
Journal of the Geological Society, 162, 763-775, 1 September 2005, https://doi.org/10.1144/0016-764904-102
Rian A. Dutch
Continental Evolution Research Group, School of Earth and Environmental Science, University of Adelaide, S.A. 5005, Australia (e-mail: rian.dutch@adelaide.edu.au)
  • Find this author on Google Scholar
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Martin Hand
Continental Evolution Research Group, School of Earth and Environmental Science, University of Adelaide, S.A. 5005, Australia (e-mail: rian.dutch@adelaide.edu.au)
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  • Find this author on PubMed
  • Search for this author on this site
Chris Clark
Continental Evolution Research Group, School of Earth and Environmental Science, University of Adelaide, S.A. 5005, Australia (e-mail: rian.dutch@adelaide.edu.au)
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Cambrian reworking of the southern Australian Proterozoic Curnamona Province: constraints from regional shear-zone systems

Rian A. Dutch, Martin Hand and Chris Clark
Journal of the Geological Society, 162, 763-775, 1 September 2005, https://doi.org/10.1144/0016-764904-102
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  • Article
    • Abstract
    • Geological setting
    • Existing constraints on the timing of shear-zone development in the Curnamona Province
    • Brief geological descriptions of selected shear-zone locations
    • Petrography
    • Mineral chemistry
    • P–T conditions of shear-zone formation
    • Metamorphic phase equilibria constraints on the evolution of the shear-zone assemblages
    • Age constraints on the formation of shear-zone assemblages
    • Discussion
    • Conclusions
    • Acknowledgements
    • References
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