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Granite, gabbro, and migmatite field relationships in the Proterozoic Lamboo Complex of the East Kimberley region, Western Australia

Created 16/10/2025

Updated 16/10/2025

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Intrusive contacts between granite plutons and adjacent gabbro in the Proterozoic Lamboo Complex are characterised by net-veined complexes in which pillow-like mafic bodies are enclosed in and veined by granitic rock. Pillow features, such as marginal chilling and cuspate contacts with granitic rock, are diagnostic of magma mingling, and show that either the mafic and felsic components of the net-veined complexes were intruded as magmas together or, as is considered more likely, mafic magma was intruded into already emplaced granite which became partly melted and remobilised; i.e. granite plutons are older than adjacent gabbro intrusions, not younger as previously proposed. Differences in age between granite and adjacent gabbro are probably not large, as the granite is presumed to have been hot, and perhaps not completely crystallised, at the time of gabbro intrusion, to account for the large volumes of remobilised granitic melt represented in the net-veined complexes. Migmatite spatially associated with the net-veined complexes may be attributed to partial melting during gabbro intrusion, rather than to an earlier regional metamorphism.

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Title Granite, gabbro, and migmatite field relationships in the Proterozoic Lamboo Complex of the East Kimberley region, Western Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/e86167f6-8132-4df1-a858-70a871539e1a
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        127.0,
        -18.7
      ],
      [
        128.98,
        -18.7
      ],
      [
        128.98,
        -16.7
      ],
      [
        127.0,
        -16.7
      ],
      [
        127.0,
        -18.7
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Granite, gabbro, and migmatite field relationships in the Proterozoic Lamboo Complex of the East Kimberley region, Western Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/granite-gabbro-and-migmatite-field-relationships-in-the-proterozoic-lamboo-complex-of-the-east-