Geophysical Indicators of Controls on Soil Salinisation and Implications, Longford Basin, Northern Tasmania

N. G. Direen; M. J. Roach

doi:10.1071/EG997034

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

Geophysical Indicators of Controls on Soil Salinisation and Implications, Longford Basin, Northern Tasmania
Authors N. G. Direen^a and M. J. Roach^a
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^a Centre for Ore Deposit and Exploration Studies (CODES), University of Tasmania, , GPO Box 252-79, Hobart, 7001, . Phone:(03) 6226 2391, Facsimile:(03) 6226 7662
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 28, Issue 1-2, Mar 1997, p. 34 - 38
DOI: https://doi.org/10.1071/EG997034
- Published online: 01 Mar 1997

Abstract

A SIROTEM survey and experimental petrophysical data from drillcores have enabled a study of apparent conductance anomalies in and around the Longford Basin of northern Tasmania. Within the basin depocentre, conductance anomalies due to the thickness irregularity of highly conductive layers reflect stacking and migration of fluvial systems. Outside the basin margins, conductance anomalies reflect changes in the conductivity of drainage bedload which is a function of watershed lithology.

The anomalously conductive Tertiary sediments have three possible sources for stored salt: inheritance from erosion of conductive Triassic red bed sequences in the basement below the Tertiary sequence; relict meteoric salt from proximity to a drowned estuary; or ions released from extensive lateritisation of lavas after a period of Eocene to Miocene basaltic volcanism.

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References

Anderson, A., Dodds, A.R., McMahon, S., and Street, G.J., 1993, Acomparison of airborne and ground electromagnetic techniques for mapping shallow zone resistivity variations: Exploration Geophysics 24, 323-332.
Anderson, H. and Street, G., 1993, Interpretation Report QUESTEM Salinity Survey, Cressy-Longford Area, Tasmania: World Geoscience Corporation Limited (unpublished).
Brownlow, A.H., 1979, Geochemistry, Prentice-Hall, USA.
Davidson, J.K., 1969, Upper Permian and lower Triassic sedimentation and palynology of the La Perouse area: B.Sc. (Hons) thesis, University of Tasmania (unpublished).
Direen, N.G., 1995, Geophysical modelling of the Longford Basin, northern Tasmania: B.Sc. (Hons) Thesis, University of Tasmania (unpublished).
Forsyth, S.M., 1989a, The Tamar Graben, in Baillie, P.W. et al., 1989, Jurassic and Cainozoic, in Burrett, C.F. and Martin, E.L., eds, 1989, Geology and mineral resources of Tasmania, Special Publication of the Geological Society of Australia 15.
Forsyth, S.M., 1989b, Upper Parmeener Supergroup, in Burrett, C.F. and Martin, E.L., eds, 1989, Geology and mineral resources of Tasmania, Special Publication of the Geological Society of Australia 15.
Hutton, J.T., 1957, Rain Water Analysis, Divisional Report of the Division of Soils,CSIRO, Australia 8/57.
Leaman, D.E., 1973, Applied geophysics in Tasmania Part 1. Summary of surveys and rock properties: Australian Society of Exploration Geophysicists, Bulletin 4, 27-58.
Matthews, W.L., 1974, Longford Basin Geology 1:100 000, Tasmania Department of Mines.
Matthews, W.L., 1983, Geology and groundwater resources of the Longford Tertiary Basin, Bulletin of the Geological Survey of Tasmania 59, Tasmanian Department of Mines, Hobart.
Matthews, W.L., 1989, Longford Basin, in Baillie, P.W. et al., 1989, Jurassic and Cainozoic, in Burrett, C.F. and Martin, E.L., eds, Geology and mineral resources of Tasmania, Special Publication of the Geological Society of Australia 15.
Maynard, B.R., 1996, Reservoir characterisation of the Liffey/Faulkner Group, B.Sc. (Hons) thesis, University of Tasmania (unpublished).

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Article Type: Research Article

Keyword(s): onshore basins; soil salinisation; Tasmania; TEM; Tertiary sequences

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Geophysical Indicators of Controls on Soil Salinisation and Implications, Longford Basin, Northern Tasmania

Abstract

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