Seismic refraction inversion of a palaeochannel system in the Lachlan Fold Belt, Central New South Wales

Tara J. Deen; Karsten Gohl; Christopher Leslie; Eva Papp; Kevin Wake-Dyster

doi:10.1071/EG00389

ISSN: 0812-3985
E-ISSN: 1834-7533

Seismic refraction inversion of a palaeochannel system in the Lachlan Fold Belt, Central New South Wales
Authors Tara J. Deen^a, Karsten Gohl^b, Christopher Leslie^c, Eva Papp^d and Kevin Wake-Dyster^e
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^a University of Sydney School of Geo Sciences Division of Geology & Geophysics, Sydney, , NSW, 2006, Phone: (02) 9351 4271, E-mail: [email protected] ^b Macquarie UniversityDept of Earth & Planetary Sciences and CRC AMET, Sydney, , NSW, 2109, Phone: (02) 9850 8376, Facsimile: (02) 9850 6904, E-mail: [email protected] ^c CRC LEME, Department of Geology Australian National University, Canberra, , ACT, 0200, Phone: (02) 6249 9540, Facsimile: (02) 6249 9930, E-mail: [email protected] ^d CRC LEME, Department of Geology Australian National University, Canberra, , ACT, 0200, Phone: (02) 6249 9498, Facsimile: (02) 6249 9930, E-mail: [email protected] ^e Formerly: ANSIR, Australian Geological Survey Organisation (AGSO), GPO Box 378 Canberra, , ACT, 2601
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 31, Issue 1-2, Mar 2000, p. 389 - 393
DOI: https://doi.org/10.1071/EG00389
- Published online: 01 Mar 2000

Abstract

We assess a method for conducting seismic refraction inversion in a 3-D setting to image the shape and structure of a palaeochannel. The trial survey was conducted over a suspected Tertiary palaeochannel adjacent to the Wyalong goldfields (Lachlan Fold Belt) in central NSW. This work has implications for the control of groundwater migration and dryland salinity studies. The method was conducted using standard multichannel seismic recording equipment and an unconventional 3-D field geometry. Three-dimensional velocity-depth models show a 4-layer sub-horizontal system underlain by high-velocity metasedimentitic basement at a variable depth, ranging from 70 to 170 m. The interpreted palaeochannel is coincident with high magnetic intensity features identified from recent surveys of the region.

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References

Bartlett, B., 1999. The use of geophysical techniques in delineating palaeochannels near Wyalong, NSW: unpublished honours thesis, CRCAMET, Curtin University.
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Gibson, D.L. and Chan, R.A., 1999. Regolith and Landscape Mapping and Evolution, Forbes 1:250 000 Geological Sheet Field Conference Guide: AGSO record 1999/20, 24-32.
Lawrie, K.C., 1999. Subsurface geophysical mapping of buried Tertiary palaeochannels for the 'Gilmore' project: AUSGEO News, April 1999.
Lawrie, K.C., Chan, R.A., Gibson, D.L. and de Souza Kovacs, N., 1999. Alluvial gold potential in buried palaeochannels in the Wyalong district, Lachlan Fold Belt, New South Wales: AGSO Research Newsletter, 30, 1-5.
Leslie, C., Jones, L., Papp, E., Wake-Dyster, K., Deen, T.J. and Gohl, K., 1999. Highresolution seismic reflection imaging of palaeo-channels near West Wyalong, NSW: this volume.
Miller, R.D. and Xia, J., 1997. Delineating palaeochannels using shallow seismic reflection: The Leading Edge, November 1997, 1571-1674.
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Vidale, J.E., 1990. Finite-difference calculation of traveltimes in three dimensions: Geophysics, 55, 521-526.
Zelt, C.A. and Smith, R.B., 1992. Seismic travel time inversion for 2-D crustal velocity structure: Geophys. J. Int., 108, 16-34.
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Article Type: Research Article

Keyword(s): 3-D refraction seismic; palaeo-Lachlan River system; palaeochannel; travel-time inversion

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Seismic refraction inversion of a palaeochannel system in the Lachlan Fold Belt, Central New South Wales

Abstract

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