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Inferred Magnesium Number Maps for the Bulk Lithospheric Mantle Beneath Australia

Created 17/10/2025

Updated 17/10/2025

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Raster datasets of inferred magnesium number for the bulk lithospheric mantle across the Australian continent. The magnesium number is an elemental ratio, defined by Mg / (Mg + Fe), which correlates to the relative enrichment or depletion in incompatible elements. Oxide concentrations are inferred in from thermo-chemical inverse modelling of Rayleigh phase velocities, surface heat flow, geoid anomalies, and topography. The magnesium number rasters summarise the results of a Markov-chain Monte Carlo sampling of the posterior model space from an ensemble of plausible candidate models. Model release 'FR23' is developed using primary-mode Rayleigh phase velocity grids adapted from Fishwick & Rawlinson (2012; "3-D structure of the Australian lithosphere from evolving seismic datasets"). Model release 'KY22' is developed using the primary-mode Rayleigh phase velocity grids of Yoshizawa (2014; "Radially anisotropic 3-D shear wave structure of the Australian lithosphere and asthenosphere from multi-mode surface waves"). All models are products of the Exploring for the Future program.

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Additional Info

Field Value
Title Inferred Magnesium Number Maps for the Bulk Lithospheric Mantle Beneath Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/ceb67827-4bf8-4f52-a516-9cab97429479
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 30/11/2023
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        155.0,
        -46.0
      ],
      [
        111.0,
        -46.0
      ],
      [
        111.0,
        -9.0
      ],
      [
        155.0,
        -9.0
      ],
      [
        155.0,
        -46.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Inferred Magnesium Number Maps for the Bulk Lithospheric Mantle Beneath Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/inferred-magnesium-number-maps-for-the-bulk-lithospheric-mantle-beneath-australia