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Petrology and geochemistry of Proterozoic dolerites from the Mount Isa Inlier

Created 16/10/2025

Updated 16/10/2025

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The Precambrian Mount Isa Inlier in northwest Queensland is extensively cut by numerous dolerite intrusions. At least two distinct episodes of dolerite intrusion have been recognised in each of the three major tectonic units: the western succession, basement sequence, and eastern succession. Olivine and quartz tholeiites predominate. The rocks in the western succession and basement sequence display little chemical variation with time. Those of the eastern succession display greater chemical variations. The most likely present-day tectonic analogue is that of an intracontinental rift. There is no evidence in the composition of the mafic igneous rocks to suggest that they were formed in a subduction-related environment such as an island arc or continental margin.

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Field Value
Title Petrology and geochemistry of Proterozoic dolerites from the Mount Isa Inlier
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/3e4cf674-57f1-49c7-9706-13282579045d
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        138.54,
        -22.26
      ],
      [
        141.36,
        -22.26
      ],
      [
        141.36,
        -18.47
      ],
      [
        138.54,
        -18.47
      ],
      [
        138.54,
        -22.26
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Petrology and geochemistry of Proterozoic dolerites from the Mount Isa Inlier". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/petrology-and-geochemistry-of-proterozoic-dolerites-from-the-mount-isa-inlier