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Geology, petrology, and tectonic significance of Permian and Carboniferous igneous rocks of the western Georgetown Inlier, north Queensland

Created 17/10/2025

Updated 17/10/2025

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Volcanic and intrusive rocks of Permian age, ranging from basalt and andesite through granodiorite and dacite to rhyolite, are sparsely but non-randomly distributed in the western Georgetown Inlier, including newly recognised areas in the Croydon region. The basaltic to andesitic rocks are typical intra-plate transitional alkaline rocks, apparently genetically unrelated to the granodiorite/dacite to rhyolite group, which are a suite of fractionated I-type (and possibly A-type) rocks, lower in alkalis, derived from evolved (old) crustal source rocks. The Permian magmatism appears to have been controlled by northwest-trending, and some north-trending, major fractures. Carboniferous igneous rocks in the same region, although only slightly different in chemistry, include a much greater proportion of felsic ignimbrites relative to more mafic extrusive rocks, and are related to north-south aligned and/or elongated sag-type cauldron structures. Total volumes, relative proportions of mafic and felsic rocks, and, to some extent, their compositions, appear to be related to tectonic style.

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Title Geology, petrology, and tectonic significance of Permian and Carboniferous igneous rocks of the western Georgetown Inlier, north Queensland
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/98c61646-b964-46d6-adbd-4341a702de2a
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        141.28,
        -20.38
      ],
      [
        145.76,
        -20.38
      ],
      [
        145.76,
        -16.8
      ],
      [
        141.28,
        -16.8
      ],
      [
        141.28,
        -20.38
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Geology, petrology, and tectonic significance of Permian and Carboniferous igneous rocks of the western Georgetown Inlier, north Queensland". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/geology-petrology-and-tectonic-significance-of-permian-and-carboniferous-igneous-rocks-of-the-w