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IV.—The Pahang Volcanic Series

Published online by Cambridge University Press:  01 May 2009

E. S. Willbourn B.A.
E. S. Willbourn B.A.
Affiliation:
Assistant Geologist, Federated Malay States.
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Extract

By far the greater part of the volcanic rocks of Malaya consists of fragmental deposits, which at first sight seem to be andesite-tuffs and andesite-breccias, for most of them contain abundant fragments of andesitic lava. However, the majority also contain numerous fragments of quartz, some of which occur as isolated angular grains in the cement, others embedded in a very fine-grained siliceous rock, and sometimes showing rounded outlines and even bays, invaded by the siliceous aggregate. Tuffs which occur in certain localities, e.g. at Kuala Tekal, Tembeling, and Sibah near Kuala Lipis on the Pahang railway, contain the usual fragments of andesite-lava, with numerous fragments of quartz like those just described, and in addition fragments of rhyolite-lava or quartz-porphyry. It is probable that the great majority of the Pahang Volcanic Series of tuffs are formed of an admixture of andesitic, rhyolitic, and sedimentary material.

Type
Original Articles
Information
Geological Magazine , Volume 4 , Issue 11 , November 1917 , pp. 503 - 514
Copyright
Copyright © Cambridge University Press 1917

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References

1 Dr. Gregory's description of the Ambrym eruptions will appear in the December Number.

1 Described by Mr.Scrivenor, in The Geology and Mining Industries of Ulu Pahang, Kuala Lumpur, 1911, p. 43, No. 1851, pl. xi.Google Scholar

2 Plate XXIX of rock-sections, also explanation, appeared with the earlier part of this paper in the October Number, facing p. 462.

3 An asterisk marks the names of all those places in Malaya mentioned in the text which are outside the area shown on the accompanying Map, Plate XXX.

1 The Geology and Mining Industries of Ulu Pahang, Kuala Lumpur, 1911, p. 47.Google Scholar

1 The Geology and Mining Industries of Ulu Pahang, Kuala Lumpur, 1911, p. 56.Google Scholar

2 Quart. Journ. Geol. Soc., vol. lxiii, p. 227.Google Scholar

3 Scrivenor, J. B., “Radiolarian-bearing Rocks in the East Indies”: Geol. Mag., Dec. V, Vol. IX, No. VI, 06, 1912, pp. 241–8CrossRefGoogle Scholar. Mr. Scrivenor discusses the origin of the Peninsula chert, and points out that in Kedah the chert is not associated with volcanic rocks. He suggests that large quantities of silica in solution, supplied by tropical weathering of siliceous rocks, may have promoted, or helped to promote, the abundant growth of Radiolaria in shallow seas.

1 Dixon, E. E. L., Quart. Journ. Geol. Soc., vol. lxvii, pp. 511–31, 1911.Google Scholar

1 Verbeek, R. D. M., “Top. En. geol. beschrijving van een gedeelte van Sumatra's West Kust”: Batavia Landsdrukkerij, 1883, p. 270.Google Scholar

2 Volz, W., “Zur Geologie von Sumatra”: Geol. und paläontol. Abhandlungen herausgegeben von E. Koken, Neue Folge, Bd. vi, Hft. ii, pp. 87 ff., Jena, 1904.Google Scholar