Production of a Residual Gravity Field Map for Tasmania and Some Implications

D. E. Leaman; R. G. Richardson

doi:10.1071/EG989181

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

Production of a Residual Gravity Field Map for Tasmania and Some Implications
Authors D. E. Leaman^a and R. G. Richardson^b
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^a Leaman Geophysics G.P.O. Box 320 Hobart, TAS. 7001 ^b Mines Department, P.O. Box 56 Rosny Park, TAS. 7018
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 20, Issue 1-2, Mar 1989, p. 181 - 184
DOI: https://doi.org/10.1071/EG989181
- Published online: 01 Mar 1989

Abstract

The substantial gravity data base in Tasmania has been used to formulate a regional crustal model. This was derived by array modelling techniques for geological sources of crustal scale. A simultaneous solution for mantle, basement and granite forms was created by this means within a framework of realistic and internally consistent assumptions. The regional field derived from this geological model (including the ocean basins) is not dependent on any filtering or smoothing procedure and thus the magnitude and sign of any residuals is absolute. The residual map was produced by removing the effect of the crustal model at individual data points. The resultant map enables detailed and reliable modelling of upper crustal features as well as revealing crustal character hitherto concealed beneath post Carboniferous cover. An important example of the value of the residual separation is shown by the structural relationships exposed in NE Tasmania which involve gold mineralisation.

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References

Johnson, B. D. (1972), ‘Crustal structure studies in Tasmania’, Ph.D. thesis, University of Tasmania, Hobart.
Johnson, B. D. (1974), ‘Analysis of the regional gravity field in Tasmania using orthogonalized trigonometric functions’, Geophys. J. R. Astr. Soc, 36, 285-294.
Leaman, D. E. (1975), ‘Gravity survey of the Rossarden-Storys Creek region’, Tech. Rep. Dep. Mines Tasm.,19, 55-81.
Leaman, D. E. (1986), ‘Gravity interpretation, west and north west Tasmania’, Mt. Read Volcanics Project Rep. Dep. Mines
Leaman, D. E. (1988), ‘MANTLE-88. Regional gravity field, Tasmania’, Mt. Read Volcanics Project Rep. Dep. Mines Tasmania.
Leaman, D. E. Richardson, R.G. Shirley, J. E. (1980), Tasmania - the gravity field and its interpretation’, Unpub. Rep. Dep. Mines Tasm. 1980/36.
Leaman, D. E., and Richardson, R. G. (1989), ‘Granites of W and NW Tasmania’, Bull. Geol. Surv Tasm. 67 (in press).
Richardson, R. G. (1980), ‘Crustal seismology’, Ph.D. thesis. University of Tasmania, Hobart.

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Article Type: Research Article

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Production of a Residual Gravity Field Map for Tasmania and Some Implications

Abstract

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