A magnetic signature for tin deposits in south-east Australia

S. S. Webster

doi:10.1071/EG984015

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

A magnetic signature for tin deposits in south-east Australia
Authors S. S. Webster^a
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^a Geological Survey of New South Wales, GPO Box 5288 Sydney, NSW, 2001
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 15, Issue 1, Mar 1984, p. 15 - 31
DOI: https://doi.org/10.1071/EG984015
- Published online: 01 Mar 1984

Abstract

The major hardrock tin deposits in south-east Australia have a characteristic magnetic signature in the vicinity of each deposit. This magnetic signature is due to the high temperatures of intrusion, being close to the Curie point of magnetite, imposing a remanent effect within the meta-morphic aureole.

The tin deposits are intimately related to the ilmenite series granitoids of Ishihara (1978) which have been linked with the S-type granitoids of Chappell and White (1974). These granites are usually non-magnetic and circumscribed by magnetic aureoles in the country rock. These magnetic parameters can be explained by the temperature - oxygen fugacity characteristics of the parent melt.

The non-tin-mineralized granitoid suite, labelled magnetite series by Ishihara and l-type by Chappell and White, are moderately to strongly magnetic in south-east Australia. Non-magnetic l-type granitoids are common elsewhere, and can be caused by the replacement of Ti-magnetite by secondary sphene. The l-type granitoids (magnetite + sphene series) have a Cu - Mo - W mineral association.

The relationship of tin mineralization to the S-type granitoids is that the deposits are found peripheral to the granitoids, in close association with their late and fine grained derivatives. The S-type granitoids may themselves be quite barren (Strong 1981). The mineralized late phase intrusions of north-west Tasmania exhibit a similar magnetic aureole to that surrounding the granitoids, as evidenced near the carbonate-replacement deposits at Mt Lindsay, Cleveland and Severn at Zeehan.

Examples are given from north-west Tasmania to illustrate the signature of the Renison-Bell, Cleveland, Mt Lindsay and Severn deposits. Regional and local geophysical data from central New South Wales are presented to further illustrate the model for granites and mineralization at Ardlethan, Kikoira and Tallebung.

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References

Chappell, B. W. & White, A. J. R. (1974), ‘Two contrasting granite types’. Pacific Geol. 8, 173-40.
Collins, P. L. F. (1981), ‘The geology and genesis of the Cleveland Tin Deposit, W. Tasmania: Fluid inclusion and stable isotope studies’, Econ. Geol. 76, 365-92.
Degeling, P. R. (1975), Girilambone - Wagga anticlinoral zone’, in Mineral Deposits of NSW.
Heugh, J. P. (1978), ‘Cargelligo - Narrandera 1:250 000 Metallo-genic map mine data sheets and metallogenic studies’. New South Wales Geological Survey Publ.
Ishihara, S. (1978), ‘Metallogenesis in the Japanese Island arc system’, J. Geol. Soc. (Lond.) 135, 389-406.
Ishihara, S. et al. (1979), ‘The magnetite-series and ilmenite-series granitoids and their bearing on tin mineralization’, Geol. Soc. Malaysia Bull. 2, 103-10.
Kwak, T. A. P. (1983), ‘The geology and geochemistry of the zoned Sn - W - F skarns at Mt Lindsay, Tasmania, Australia’, reprint.
Kwak, T. A. P. & White, A. J. R. (1982), ‘Contrasting W - Mo - Cu and W - Sn - F skarn types and related granitoids. Mining Geol. 32, 339-51.
Newnham, L. A. (1975), ‘Renison Bell tin field’, in C. L. Knight (ed.) Economic Geology of Australia and Papua New Guinea, Vol. 1, Metals, pp. 581-3, AIMM Monogr. Ser. No. 5.
Patterson, D. J. et al. (1981), ‘Geologic setting and genesis of cas-siterite-sulphide mineralization at Renison-Bell, Western
Tasmania’, Econ. Geol. 76, 393-438. Patterson, R. (1981), ‘Geology of the Ardlethan tin mine. Presented at the ‘Symposium on Geology and Mineralization in the Lachlan Fold Belt’, NSWIT, 1982.
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Article Type: Research Article

Keyword(s): I and S granitoids; magnetic aureole; magnetic signature; south-east Australia; tin mineralization

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A magnetic signature for tin deposits in south-east Australia

Abstract

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