Murray-Riverina region: an interpretation of bedrock Palaeozoic geology based on geophysical data
Interpretation of data from the Murray–Riverina airborne magnetic and radiometric survey, acquired in early 2003, has revealed many underlying bedrock features in a region covered by a blanket of Cainozoic sediments.
The new airborne magnetic data, in combination with regional gravity data, contribute to a greater understanding of the geometry and evolution of basement geology through the definition of structural zones. The data are interpreted to define major faults, granitic bodies, basins and igneous centres. Interpretation of the magnetic and gravity data suggests that both the Stawell, Bendigo and Tabberabbera structural zones defined in Victoria continue north into New South Wales. A new zone, named the Hay–Booligal Zone, covers the central section of the survey area and is wholly within New South Wales.
These new data suggest enhanced economic potential in the Murray–Riverina region for extensions of the gold-rich Bendigo and Stawell Zones from Victoria under the Murray Basin in New South Wales.
Contents of Issue No. 118 of Quarterly Notes include:
- Introduction - Data acquisition
- Geological framework
- Geophysical interpretation - Bendigo, Tabberabbera, Hay-Booligal and Stawell zones
- Geophysical modelling - Granitic bodies and contact metamorphic aureoles
- New interpretation of basement structural framework - Stawell, Bendigo, Hay-Booligal and Tabberabbera zones; Structural zones - geophysical data profiles
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Quarterly Notes, Issue No. 118 |
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