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Rb-Sr geochronology of Proterozoic events in the Arunta Inlier, Central Australia

Created 17/10/2025

Updated 17/10/2025

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Rb-Sr data reveal a long and complex Proterozoic history for the Arunta Inlier of central Australia. The first event was a widespread, dominantly granulite-facies episode, known as the Strangways Event, at 1790 ± 35 Ma. Five relatively precise ages from metamorphic and granitic rocks give an estimate between 1650 and 1700 Ma for widespread deformation and metamorphism during the Aileron Event. Two granites in the northern Arunta Inlier were probably emplaced at about 1500 m.y. Deformation and low-grade metamorphism during the Anmatjira Event are dated by generally imprecise isochrons at about 1400 Ma. Four isochrons, documenting both primary events and resetting, are in accord with an age of 900-1050 Ma for the Ormiston Event. The Rb-Sr data do not define the time of initial crust formation in the Arunta Inlier.

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Field Value
Title Rb-Sr geochronology of Proterozoic events in the Arunta Inlier, Central Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/5291fb59-3bec-4cc3-86ae-4a622310b75f
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        130.0,
        -25.0
      ],
      [
        137.0,
        -25.0
      ],
      [
        137.0,
        -19.0
      ],
      [
        130.0,
        -19.0
      ],
      [
        130.0,
        -25.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Rb-Sr geochronology of Proterozoic events in the Arunta Inlier, Central Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/rb-sr-geochronology-of-proterozoic-events-in-the-arunta-inlier-central-australia