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Reply to discussion by Conor et al. on "Detachment faulting and bimodal magmatism in the Palaeoproterozoic Willyama Supergroup, south-central Australia : keys to recognition of a multiply deformed Precambrian metamorphic core complex

Created 17/10/2025

Updated 17/10/2025

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C. H. H. Connor, W. V. Pries, R. W. Page, B. P. J. Stevens, I. R. Plimer and P. M. Ashley write: Gibson & Nutman (2004) postulate that the Willyama Supergroup in the southern Curnamona Province contains a 1690 1670 Ma metamorphic core complex, and imply that this is relevant to the genesis of the Broken Hill Pb-Zn-Ag deposit. We contend that this is a model-driven, speculative interpretation predicated upon unsupported assertions that conflict with substantial stratigraphic and geochronological data. Not only does the paper fail to demonstrate an early high-grade event and formation of a metamorphic core complex at 1690-1670 Ma, but it is also factually incorrect in several critical geological and geochronological aspects. The detachment concepts of Gibson & Nutman may appear persuasive, but only by omitting reference to a huge body of published and recent mapping and laboratory research, by companies, universities, and geological surveys, some of which are cited here. Surprisingly, Gibson & Nutman ignore much recent work (e.g. Page et al. 2004) to which one of them has contributed

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Title Reply to discussion by Conor et al. on "Detachment faulting and bimodal magmatism in the Palaeoproterozoic Willyama Supergroup, south-central Australia : keys to recognition of a multiply deformed Precambrian metamorphic core complex
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/7aa917bc-be16-4cce-97ed-3ee5aa6064cc
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        129.0,
        -38.0
      ],
      [
        145.0,
        -38.0
      ],
      [
        145.0,
        -26.0
      ],
      [
        129.0,
        -26.0
      ],
      [
        129.0,
        -38.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

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This dataset was originally found on Geoscience Australia "Reply to discussion by Conor et al. on "Detachment faulting and bimodal magmatism in the Palaeoproterozoic Willyama Supergroup, south-central Australia : keys to recognition of a multiply deformed Precambrian metamorphic core complex". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/reply-to-discussion-by-conor-et-al-on-detachment-faulting-and-bimodal-magmatism-in-the-palaeopr