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The conductivity structure of the Georgina-Arunta region from magnetotelluric data

Created 16/10/2025

Updated 16/10/2025

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We present an updated resistivity model from inversion of the 09GA-GA1 deep magnetotelluric survey, also known as the Georgina-Arunta survey. The data were originally collected in 2009 under Geoscience Australia’s Onshore Energy Security Program, together with deep seismic reflection data along the same line. The magnetotelluric data comprise broadband and long-period data. The broadband data were originally processed to a bandwidth of 0.04 s to 100 s, but have been reprocessed yielding an extended bandwidth of 0.04 s to 1000 s, which improves the resolution of deeper (>20 km depth) structures. Inversions have been carried out using the ModEM 3D inversion code given that the data indicate the presence of 3D geoelectric structure. The updated resistivity model reveals that the Casey Inlier and Irindina Province are associated with high resistivities (>2000 Dm). In contrast, the Aileron Province, which underlies and surrounds the Irindina Province, is predominantly conductive (resistivities <50 Dm). The Georgina Basin is associated with low resistivities, as would be expected for a sedimentary basin, while the Amadeus Basin is associated with low resistivities in the southern part of the line (where it overlies the Casey Inlier), and higher resistivities further north. Abstract for Australian Exploration Geoscience Conference (AEGC) 18-21 February 2018, Sydney NSW (https://www.aig.org.au/events/first-australian-exploration-geoscience-conference/)

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Field Value
Title The conductivity structure of the Georgina-Arunta region from magnetotelluric data
Language English
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/6ad73876-1ea0-4d0a-b4b2-7a65dc2a89bd
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 19/01/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "The conductivity structure of the Georgina-Arunta region from magnetotelluric data". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/the-conductivity-structure-of-the-georgina-arunta-region-from-magnetotelluric-data