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III.—Pneumatolytic Alteration of a very fine-grained Granitic Rock from Negri Sembilan, Federated Malay States3

Published online by Cambridge University Press:  01 May 2009

E. S. Willbourn
Affiliation:
Assistant Geologist, F.M.S.

Extract

About one mile to the north of the railway station at Ayer Kuning, in the south of Negri Sembilan, one of the Federated Malay States bordering on Johore and Malacca, is a low but conspicuous range of hills covered with long grass. The highest of the hills, on which is a beacon used by the Trigonometrical Survey, stands about 300 feet above the level of the surrounding country. The general trend of the hill range is in a direction of S. 60° W. to N. 60° E., and there are several hills which branch from the main axis, usually more or less at right angles to it. The eastern half of the range over a distance of about half a mile only need be considered, as there are no rock exposures on the western half.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1916

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References

page 444 note 1 , Zirkel, Petrographie, vol. ii, p. 41, 1894.Google Scholar

page 444 note 2 Rosenbusch, H., Mikroskopische Physiographie, II Massige Gesteine, p. 462, 1896.Google Scholar

page 444 note 3 Zirkel, , Petrographie, vol. iii, p. 793, 1894.Google Scholar

page 445 note 1 Mem. Geol. Survey, Land's End District, p. 65, 1907.Google Scholar

page 445 note 2 As the ground-mass is not cryptocrystalline but a fine-textured crystalline aggregate of quartz and felspar, the best term is either granite porphyry or microgranite, and granite porphyry is the better of these, because of the phenocrysts.Google Scholar

page 445 note 3 Q.J.G.S., vol. li, p. 142, 1895.Google Scholar