Authors / CoAuthors
Wang, L. | Hitchman, A.P.
Abstract
For the first time, the 3 D model reveals upper-mantle enhanced conductivity anomalies beneath Archaean cratonic regions and Phanerozoic terranes imaged by the AWAGS dataset. These anomalies are consistent with the results of two recent magnetotelluric surveys, one along a profile in the Yilgarn-Officer Basin-Musgrave Block, another in the Gawler Craton region. Across much of central Australia a resistivity gradient in the middle lithosphere is observed. This region corresponds well with a recognised seismic velocity gradient across the middle-lithosphere boundary. Resistivity differences are also observed for the first time beneath Archaean cratons in Western Australia. The Pilbara Craton is represented as an enhanced conductivity anomaly at middle lithosphere depth, corresponding well with the lower-velocity anomaly evident in surface wave tomography models. The Yilgarn Craton is imaged as a resistive body, exceeding 104 ohm m, continuing to greater depths.
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nonGeographicDataset
eCat Id
76181
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- External PublicationArticle
- ( Theme )
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- 3D model
- ( Theme )
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- geomagnetism
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- AU
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Electrical and Electromagnetic Methods in Geophysics
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- Published_Internal
Publication Date
2013-01-01T00:00:00
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geoscientificInformation
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[-45.0, -5.0, 100.0, 170.0]
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