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The deuteric mineral sequence in the Enoggera granite, Queensland

Published online by Cambridge University Press:  14 March 2018

Marjorie J. Whitehouse
Marjorie J. Whitehouse*
Affiliation:
Geology Department, University of Queensland
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Extract

The Enoggera 'granite', in which occur the minerals to be described, is situated a few miles to the west of the city of Brisbane, and within the Greater Brisbane area. Deuteric and allied minerals have previously been recorded from quarries in the granite by H. C. Richards and W. H. Bryan, and a specimen is recorded ill the Queensland Mineral Index as 'Heulandite occurring as geodes in granite. Loc. Enoggera.'

The granite itself is very varied in character, and Bryan has recognized two main types, a pink phase and a grey phase. The pink phase approaches an adamellite, while the grey is more granodioritic in character. There is, however, every gradation from one type to the other due to admixture, and this reaches its maximum in a hybrid rock formed presumably by the mingling of the two magmas.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 24 , Issue 157 , June 1937 , pp. 538 - 546
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1937

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References

Page 538 note 1 Richards, H. C., The building stones of Queensland, Proc. Roy. Soc. Queensland. 1918, vol. 30, p. 102.Google Scholar

Page 538 note 2 Bryan, W. H., Geology and petrology of the Enoggera granite and allied intrusives. Proc. Roy. Soc. Queensland, 1923, vol. 34 (for 1922), p. 142.Google Scholar

Page 538 note 3 Dunstan, B., Queensland mineral index. Queensland Geol. Surv., 1913, publ. no. 241, p. 560.Google Scholar

Page 538 note 4 An examination of this specimen, kindly lent by the Geological Survey, shows that the 'heulandite' is in fact laumontite.

Page 539 note 1 Bryan, W. H., unusual tourmaline-albite rock from Enoggera, Queensland. Proc. Roy. Soc. Queensland, 1924, vol. 35 (for 1923), pp. 48-60.Google Scholar

Page 539 note 2 Ball, L. C., Queensland Government Mining Journ., 1920, vol. 21, pp. 266, 484, 527.Google Scholar

Page 540 note 1 This description is based largely on a communication from Mr. M. H. Hey of the British Museum of Natural History, to whom some small fragments were submitted.

Page 544 note 1 Browne, W. R., Note on the occurrence of calcite in a basalt from the Maitland district, N.S.W. Journ. Roy. Soc. N.S.W., 1923, vol. 56 (for 1922), pp. 278-284.Google Scholar Notes on the petrology of the Prospect intrusion, with special reference to the genesis of the so-called sccondary minerals. Ibid., 1925, vol. 58 (for 1924), pp. 240-254.

Page 545 note 1 McLintock, W. F. P., On the zeolites and associated minerals from the Tertiary lavas around Ben More, Mull. Trans. Roy. Soc. Edinburgh, 1915, vol. 51, pp. 1-33.Google Scholar

Page 545 note 2 Fenner, C. N.. The Watchung basalt and the paragenesis of its zeolites and other secondary minerals. Ann. N.Y. Acad. Sci., 1910, vol. 20, pp. 93-187.Google Scholar