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A Rb-Sr geochronological study in the Proterozoic Tennant Creek Block, central Australia

Created 17/10/2025

Updated 17/10/2025

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Rb-Sr isotopic data from total rock and mineral samples provide a broader geochronological framework than has hitherto been available for the Proterozoic rocks of the Tennant Creek Block. The oldest documented event is the amphibolite-facies metamorphism at 1920 ± 60 m.y. of possible basement rocks from the BMR 3 area, to the west-southwest of Tennant Creek township. The lower grade metamorphic rocks of the Warramunga Group were deposited before the major deformation episode which is inferred to have occurred at about 1810 m.y. Certain of the units within the Warramunga Group, of which the Bernborough Volcanics are an example; underwent isotopic resetting of total-rock systems during subsequent deformation. Granite ages range from 1797 m.y. for a phase of the Tennant Creek Granite to less than 1500 m.y. for the Cabbage Gum and Gosse River East Granites. Dated lamprophyre and porphyry samples yield ages of about 1660 m.y. and 1760 m.y., respectively. Muscovite separates from the Juno, Warrego, Golden Forty, and Nobles Nob mines suggest a common origin for the ore deposits about 1810 m.y. ago.

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Field Value
Title A Rb-Sr geochronological study in the Proterozoic Tennant Creek Block, central Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/cad4a609-b222-4d76-bc55-612bde00ca7a
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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      ],
      [
        135.0,
        -20.0
      ],
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      ],
      [
        133.5,
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      ],
      [
        133.5,
        -20.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "A Rb-Sr geochronological study in the Proterozoic Tennant Creek Block, central Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/a-rb-sr-geochronological-study-in-the-proterozoic-tennant-creek-block-central-australia