Authors / CoAuthors
Milligan, P.R. | Franklin, R. | Minty, B.R.S. | Richardson, M. | Ravat, D.
Abstract
After 60 years of aeromagnetic surveying across Australia, Geoscience Australia is now the custodian of a unique publicly-available continental-scale airborne magnetic database. Using the Magnetic Anomaly Grid Database of Australia (MAGDA), composite grids and image maps can be generated at a variety of resolutions to suit many purposes, ranging from broad continental interpretations to investigations of small, detailed prospective areas. Intermediate wavelengths (100 km to 400 km) in composite grids have significant errors due to the lack of control available during merging. Control lines of the AWAGS (Australia-wide Array of Geomagnetic Stations) survey flown in 1990 have significantly improved the intermediate wavelengths, and a new AWAGS2 (Australia-wide Airborne Geophysical Survey) project, as part of a new Australian Government energy initiative, is currently acquiring new baseline gamma-ray spectrometric and magnetic calibration data with a 75 km line spacing and an 80 m terrain clearance. Standard derivative products are easily generated from the MAGDA database, and current interpretation research is focussed on generation of accurate depths-to-basement of interpretations of prospective areas, better definition of sedimentary basins for petroleum prospectivity evaluation, and interpreted depths to the bottom of magnetic sources in attempts to define the Curie point isotherm. Potential field data also provide important constraints for three-dimensional geological modelling; initial 3D geological models are simultaneously inverted for the secondary variables of mass density and magnetic susceptibility.
Product Type
nonGeographicDataset
eCat Id
65177
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- External PublicationAbstract
- ( Theme )
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- magnetics
- ( Theme )
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- gamma spectroscopy
- ( Theme )
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- geophysics
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2007-01-01T00:00:00
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geoscientificInformation
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