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Geochemical discrimination of acid volcanic units in the Mount Isa region, Queensland

Created 16/10/2025

Updated 16/10/2025

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A systematic examination of multivariate geochemical data for two predominantly felsic volcanic units from the Proterozoic of the Mount Isa region, the Leichhardt Metamorphics (1865 Ma) and the Argylla Formation (1777 Ma), has established practical criteria to distinguish these units. The criteria are applied to volcanics from the Ewen Block, Wonga Belt, and Bottletree Formation, which have been difficult to correlate using lithologic and structural criteria. Histograms provide limited discrimination, because of the large range of most elements. Variation diagrams using Si02 as the independent variable allow clear distinction of the two formations to be made from their relative abundances of Ti, AI, Fe, K , Ce, Cr, Nb, Pb, Sr, Th, Y, and Zr at any particular SiO content. An examination of ratios of elements with similar chemical properties effectively distinguishes the two formations. The similarity coefficient and discriminant analysis allow classification of the two formations and are of use in assigning analyses of unknown specimens. All techniques indicate that the Ewen Block volcanics are probably Leichhardt Metamorphics and that the Wonga Belt and Bottletree Formation specimens more closely resemble the Argylla Formation. The higher CaO, Sr, and Pb, and lower K20 distinguish the Bottletree Formation from the Argylla Formation and support its status as a separate formation.

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Field Value
Title Geochemical discrimination of acid volcanic units in the Mount Isa region, Queensland
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/a82ef84d-b5e8-417f-8701-a015311636eb
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        138.0,
        -22.5
      ],
      [
        141.0,
        -22.5
      ],
      [
        141.0,
        -18.0
      ],
      [
        138.0,
        -18.0
      ],
      [
        138.0,
        -22.5
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Geochemical discrimination of acid volcanic units in the Mount Isa region, Queensland". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/geochemical-discrimination-of-acid-volcanic-units-in-the-mount-isa-region-queensland