Authors / CoAuthors
Duan, J. | Fomin, T. | Milligan, P.R.
Abstract
The Australian Government's Onshore Energy Security Program (2006-2011) was completed recently by Geoscience Australia. The five year program provides pre-competitive geoscience data and value-added products for assessment of hydrocarbon, uranium, geothermal energy and mineral resources. As part of the program, broadband and long period magnetotelluric (MT) data have been acquired by Geoscience Australia in collaboration with relevant state and territory geoscience agencies and universities throughout Australia. The regional-scale MT profiles, which consist of more than 640 sites over 3700 km in distance, were obtained along 12 deep seismic reflection transects across potential mineral provinces and frontier sedimentary basins. New insights into the regional-scale electrical resistivity distributions and mechanisms gained from the MT data increase knowledge about lithospheric structures, tectonic processes, and regional geological features. For example, the MT results show resistivity contrasts at terrane boundaries and fault systems; Sedimentary basins, some shear zones, fluids, and melts exhibit significant low resistivity compared with the surrounding crust or upper mantle. The MT data complement deep seismic reflection, potential field and other geophysical and geological data for multi-disciplinary investigations of crustal architecture in the study regions. The integrated results demonstrate that there are significant spatial correlations between different geophysical data. The multi-disciplinary data reduce uncertainties and limitations of data considered separately and produce a more effective and reliable interpretation, especially for regions that have complex geological structures. They also improve the understanding of the mineral and energy potential in these regions.
Product Type
nonGeographicDataset
eCat Id
74076
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Custodian
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- GA Publication
- ( Theme )
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- geophysics
- ( Theme )
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- magneto-tellurics
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2012-01-01T00:00:00
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geoscientificInformation
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