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New K-Ar constraints on the onset of subsidence in the Canning Basin, Western Australia

Created 17/10/2025

Updated 17/10/2025

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Structural mapping and reconnaissance K-Ar studies have helped to delineate and date the latest deformational stages (D4 and D5) in the King Leopold Orogen, to the north of the Canning Basin. The dates have been determined for schists selected from both contractional shear zones and from rocks metamorphosed to the lower greenschist facies during the final phase of basement deformation. These dates imply that the basement-deforming event started in the latest Precambrian to earliest Cambrian (ca 560 Ma), and that tectonism recurred in the latest Cambrian to earliest Ordovician (ca 500 Ma). The final contractional deformation is slightly older than the oldest-known sedimentary rocks in the basin (latest Tremadoc), and helps to define the time that basin subsidence started .

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Additional Info

Field Value
Title New K-Ar constraints on the onset of subsidence in the Canning Basin, Western Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/33aa3653-2f73-40ae-a85b-ba54c71e0817
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        117.5,
        -24.0
      ],
      [
        129.0,
        -24.0
      ],
      [
        129.0,
        -16.0
      ],
      [
        117.5,
        -16.0
      ],
      [
        117.5,
        -24.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "New K-Ar constraints on the onset of subsidence in the Canning Basin, Western Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/new-k-ar-constraints-on-the-onset-of-subsidence-in-the-canning-basin-western-australia