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IV.—The Origin of Topaz and Cassiterite at Gunong Bakau, Malaya

Published online by Cambridge University Press:  01 May 2009

William R. Jones
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Extract

Topaz is commonly supposed to have been formed by the action of fluorine-bearing vapours on felspar, but evidence has recently been advanced with the object of showing that some important veins intrusive in the porphyritic granite of Gunong Bakau, a mountain 4,426 feet high, situated in the centre of the Main Granite Range of the Malay Peninsula, were formed of a rock in which “the topaz and cassiterite are not alteration products of previously formed minerals”. The author of this theory gives the rock the descriptive name of ‘quartz-topaz’, and adds as his reasons for not calling it ‘greisen’ the fact that in places it contains very little mica and that, unlike the majority of greisens, it is not an alteration product.

Type
Original Articles
Information
Geological Magazine , Volume 3 , Issue 6 , June 1916 , pp. 255 - 260
Copyright
Copyright © Cambridge University Press 1916

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References

page 255 note 2 Scrivenor, J. B., “The Topaz-bearing Rocks of Gunong Bakau”: Q.J.G.S., vol. lxx, p. 363, 1914.CrossRefGoogle Scholar

page 255 note 3 Jones, W. R., Preliminary Report of Mining in the Main Granite Range, Federated Malay States, 1913.Google Scholar

page 256 note 1 Scrivenor, J. B., op. cit., p. 370.Google Scholar

page 256 note 2 Ibid., p. 375.

page 256 note 3 Singewald, J. T., jun., “The Erzgebirge Tin Deposits”: Economic Geology, vol. v, p. 267, 1910.Google Scholar

page 256 note 4 Ibid., p. 177.

page 256 note 5 Ibid., p. 171.

page 258 note 1 Scrivenor, J. B., The Geology and Mining Industry of Kinta District, Federated Malay States (Kuala Lampur), 1913, p. 62.Google Scholar

page 258 note 2 Singewald, J. T., jun., “The Erzgebirge Tin Deposits”: Economic Geology, vol. v, p. 173, 1910.Google Scholar

page 258 note 3 Ibid.

page 258 note 4 Jones, W. R., “Mineralization in Malaya”: Min. Mag., vol. xiii, No. 4, p. 198, 10 1915.Google Scholar

page 258 note 1 Singewald, J. T., jun., “The Erzgebirge Tin Deposits”: Economic Geology, vol. v, pp. 176–7, 1910.Google Scholar

page 258 note 2 Ibid., p. 169.

page 258 note 3 Ibid., p. 174.

page 258 note 4 Solomon & His, Zeit. deutsch. geol. Ges., vol. xl, p. 250, 1888.Google Scholar

page 258 note 5 Scrivenor, J. B., “The Topaz-bearing Rocks of Gunong Bakau”: Q.J.G.S., vol. lxx, p. 378.Google Scholar

page 259 note 1 Scrivenor, J. B., “The Topaz-bearing Rocks of Gunong Bakau”: Q.J.G.S., vol. lxx, p. 379.Google Scholar

page 259 note 2 Scrivenor, J. B., Mining Magazine, February, 1916, “Discussion.”Google Scholar

page 259 note 3 Bowen, N. L., “The Later Stages of the Evolution of the Igneous Roek”: Journal of Geology, supplement to vol. xxiii, No. 8, p. 16, 1915.Google Scholar

page 259 note 4 Harker, A., The Natural History of Igneous Rocks (London, 1909), p. 166.Google Scholar

page 259 note 5 Vogt, J. H. L., “Beiträge zur genetische Classification der durch magmatische Differentiationprocesse und der durch Pneumatolyse instanden Erzvokommen”: Zeit. prak. Geol., 1895, p. 146.Google Scholar

page 259 note 6 Dalmer, K., “Der Alterberger-Graupener Zinnerslagerstättendistrikt”: Zeit. prak. Geol., 1894, p. 319.Google Scholar

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page 260 note 1 Fergusson, H. C. & Bateman, A. M., “Geologic Features of Tin Deposits”: Economic Geology, vol. vii, pp. 250–1, 1912.Google Scholar

page 260 note 2 Ibid., p. 241.

page 260 note 3 Ibid., p. 237.

page 260 note 4 After deduction of part of Al, which formed 7·86 and 7·57 per cent of these rocks.

page 260 note 5 Calculated as Fe2 O3.