From Geoscience Australia
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Gravity and Granites: Technical notes on mapping relationship between known granites and gravity

Created 17/10/2025

Updated 17/10/2025

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Gravity anomalies over granite bodies are often negative polarity and rounded polygons. These characteristics were used to trial a method to map possible locations of subsurface granite bodies. Two approaches were used to outline the geometry of rounded gravity anomalies: a) Contouring of the residual Bouguer gravity field after removal of a regional field computed by filtering of the gravity field. b) Detection of edges defined by maximum horizontal gradient of the residual Bouguer gravity field. The resulting polygons are coloured according to whether granite outcrop, or encounter in wells, falls within the gravity polygon, is near such outcrop, or not proximal to outcrop. The processing was done using software developed by the author in the Perl programming language and stored in the Energy Division software repository. The processing was organised to run in batch mode on any system on which Perl is installed, MS-Windows, Unix, Linux or NCI systems. The input and output data files are ERMapper ASCII vector format and exported to ArcGIS shape files. The visualisation tool was ER-Mapper.

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Additional Info

Field Value
Title Gravity and Granites: Technical notes on mapping relationship between known granites and gravity
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/19dc5546-eaa2-4ea4-a588-f564da720c85
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        112.0,
        -45.0
      ],
      [
        155.0,
        -45.0
      ],
      [
        155.0,
        -8.0
      ],
      [
        112.0,
        -8.0
      ],
      [
        112.0,
        -45.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Gravity and Granites: Technical notes on mapping relationship between known granites and gravity". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/gravity-and-granites-technical-notes-on-mapping-relationship-between-known-granites-and-gravity