An Electrical Conductivity Model of the Southeast Australian Lithosphere

Kate Robertson; David Taylor; Stephan Thiel; Graham Heinson

doi:10.1071/ASEG2013ab226

ISSN: 2202-0586
E-ISSN:

oa An Electrical Conductivity Model of the Southeast Australian Lithosphere
Authors Kate Robertson^a, David Taylor^b, Stephan Thiel^c and Graham Heinson^d
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^a University of Adelaide, Adelaide, , SA, 5005, [email protected] ^b Department of Primary Industries, Melbourne, , Vic, 3001, [email protected] ^c University of Adelaide, Adelaide, , SA, 5005, [email protected] ^d University of Adelaide, Adelaide, , SA, 5005, Graham,[email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2013, Issue ASEG2013 - 23rd Geophysical Conference, Dec 2013, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2013ab226
- Published online: 01 Dec 2013

Abstract

Data from 68 broadband magnetotelluric stations were inverted to obtain a 2D electrical resistivity model beneath the Delamerian Orogen in southeast Australia along a 150 km east-west transect. Station spacing of 5 km in the west and ~2 km in the east resolved structure with changes in resistivity from 10-10,000 ?m occurring laterally over several kilometres. To the west, the crust is generally resistive, with a more complex structure to the east involving narrow paths of low resistivity (10-300 ?m). These conductive regions extend from Moho depths up to the surface and align with fault structures. The narrow conductive pathways possibly track mineral alterations from reactions with mantle fluids moving upwards late in the Delamerian Orogeny.

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References

Bibby, H. M., Caldwell, T. G. & Brown, C., 2005, Determinable and non-determinable parameters of galvanic distortion in magnetotellurics: Geophysical Journal International, 163(3), 915-930.
Cagniard, L., 1953, Basic theory of the magnetotelluric method of geophysical prospecting: Geophysics, 18, 605-635.
Caldwell, T. G., Bibby, H. M. & Brown, C., 2004, The magnetotelluric phase tensor: Geophysical Journal International, 158(2), 457-469.
Cayley, R. & Taylor, D., 1998, The Lachlan margin Victoria: the Moyston Fault, a newly recognized terrane boundary: Geological Society of Australia Abstracts, 49, 73.
Chave, A. D. & Thomson, D. J., 2004, Bounded influence magnetotelluric response function estimation: Geophysical Journal International, 157(3), 988-1006.
Constable, S. C., Parker, R. L. & Constable, C. G., 1987, Occam’s inversion; a practical algorithm for generating smooth models from electromagnetic sounding data: Geophysics, 52(3), 289-300.
de Groot-Hedlin, C. D. & Constable, S. C., 1990, Occam’s inversion to generate smooth, two-dimensional models from magnetotelluric data: Geophysics, 55(12), 1613-1624.
Foden, J., Elburg, M. b., Dougherty-Page, J. & Burtt, A. c., 2006, The timing and duration of the Delamerian Orogeny: Correlation with the Ross Orogen and implications for Gondwana assembly: Journal of Geology, 114(2), 189-210.
Foster, D.A. & Gray, D., 2000, Evolution and structure of the Lachlan Fold Belt of eastern Australia: Annual Review of Earth and Planetary Sciences, 28, 47-80
Gamble, T. D., Goubau, W. M. & Clarke, J., 1979, Error analysis for remote reference magnetotellurics: Geophysics, 44(5), 959-968.
Gibson, G. M., 1992, Yarramyljup fault zone: eastern boundary of Glenelg River Complex and possible crustal suture in western Victoria: Geological Society of Australia Abstracts, 32, 232-233.
Glen, R. A., 2005, The Tasmanides of eastern Australia: Geological Society, London, Special Publications, 246(1), 23- 96.
Graeber, F. M., Houseman, G. A. & Greenhalgh, S. A., 2002, Regional teleseismic tomography of the western Lachlan Orogen and the Newer Volcanic Province, southeast Australia: Geophysical Journal International, 149(2), 249-266.
Jones, A. G., 1987, MT and reflection: an essential combination: Geophysical Journal of the Royal Astronomical Society, 89(1), 7-18.
Morand, V., Wohlt, K., Cayley, R., Taylor, D., Kemp, A., Simons, B. & Magart, A., 2003, Glenelg special map area - geological report: Technical Report 123, Geological Survey of Victoria.
O'Reilly, S. Y. & Griffin, W., 1985, A xenolith-derived geotherm for southeastern Australia and its geophysical implications: Tectonophysics, 111(1-2), 41-63.
Rawlinson, N. & Fishwick, S. (2012). Seismic structure of the southeast australian lithosphere from surface and body wave tomography: Tectonophysics, 572-573, 111-122.
Selway, K., 2012, Interpreting magnetotelluric data in tectonically stable lithosphere: 21st Electromagnetic Induction Workshop, Darwin, Australia.
Tikhonov, A., 1950, On determining electrical characteristics of the deep layers of the earth’s crust: Doklady, 73, 295-297.

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Article Type: Research Article

Keyword(s): Delamerian; lithosphere; magnetotellurics

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oa An Electrical Conductivity Model of the Southeast Australian Lithosphere

Abstract

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