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Australia-wide 3D Density and Magnetic Susceptibility Models: Method and Model Release

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Created 13/01/2025

Updated 13/01/2025

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Two coincident, crustal-scale models, one of magnetic susceptibility and one of density, have been produced for a volume covering the Australian continent and extending down to 55.5 km depth. These models were produced using the UBC‑GIF MAG3D and GRAV3D inversion programs, respectively.

The inversions were constrained with geological reference models with layers for sediments, undifferentiated crust and the mantle. The reference model for the magnetic inversion incorporated a Curie depth surface below which magnetic susceptibility was set to zero.

Due to the size of the inversion problem to be solved, the volume was divided into 235 overlapping inversions, which were inverted separately and then recombined. The method of recombining the inversions relies on a cosine function to determine the weight of each property and then takes a weighted average. This method successfully attenuated the edge effects that would otherwise occur between models and allows them to be viewed as one seamless model that covers the whole of Australia.

Regions of coincident high-density (>2.83 g/cm3) and high-magnetic susceptibility (>0.0125 SI) within the top 8‑9 km of the undifferentiated crust are suggested to be related to ultramafic rocks and the magnetite-forming hydrothermal alteration stages of potentially fertile IOCG systems.

Currently the models are available in UBCGIF format (.den/.sus) only. Other formats and all supporting input data will be added in the near future.

Due to their size, the models have been divided into subsets (labelled 1-17) for download. Please refer to the image below for the extent of the subsets.

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Additional Info

Field Value
Title Australia-wide 3D Density and Magnetic Susceptibility Models: Method and Model Release
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/578f33eb-9aed-4e3c-85f7-21b98104589d
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 09/10/2024
Geospatial Coverage {"type": "Polygon", "coordinates": [[[112.0, -44.0], [154.0, -44.0], [154.0, -9.0], [112.0, -9.0], [112.0, -44.0]]]}
Data Portal data.gov.au

Data Source

This dataset was originally found on data.gov.au "Australia-wide 3D Density and Magnetic Susceptibility Models: Method and Model Release". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/australia-wide-3d-density-and-magnetic-susceptibility-models-method-and-model-release

Original dataset
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No duplicate datasets found.