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On a partially fused quartz-felspar-rock and on glomero-granular texture

Published online by Cambridge University Press:  14 March 2018

Leonard Hawkes
Leonard Hawkes*
Affiliation:
Bedford College, London University
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Extract

The specimen to be described was found in 1925 by Miss H. K. Cargill and Miss J. A. Ledeboer on a scree slope beneath a gully in the basaltic capping of the Slaufrudal granite-granophyre stock at Kvosafoss, SE. Iceland. Unfortunately the rock was not discovered in situ, but it must belong to the upper part of the stock or a dike apophysis of it. An examination of the rock was begun by Miss Ledeboer, but she was unable to continue the work; I am indebted to her for the photographs of pl. VII, figs. 1 and 2.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 22 , Issue 127 , December 1929 , pp. 163 - 173
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1929

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References

page 163 note 1 Cargill, H. K., Hawkes, L., and Ledeboer, J. A., Quart. Journ. Geol. Soc. London, 1928, vol. 84, pp. 505-539.Google Scholar

page 166 note 1 Hallock, W., Bull. U.S. Geol. Survey, 1890, no. 60, pp. 147-148.Google Scholar

page 166 note 2 Benedicks, C. and Arpi, R., Revue de Métallurgie, 1907, vol. 4, p. 416.Google Scholar

page 166 note 3 Sosman, R. B., The properties of silica, 1927, p. 783.Google Scholar

page 166 note 4 Bowen, N. L. in Fairbanks, E. E., The laboratory investigation of ores, 1928, p. 181.Google Scholar

page 166 note 5 Vogt, J. H. L., Journ. Geol. Chicago, 1921, vol. 29, p. 336.Google Scholar

page 168 note 1 Bowen, N. L., The evolution of the igneous rocks, 1928, p. 298.Google Scholar

page 168 note 2 Cargill, H. K., Hawkes, L., and Ledeboer, J. A., 1928, loc. cit., p. 529.Google Scholar

page 168 note 3 Mere. Geol. Survey Scotland, 1911, no. 35, The geology of Oronsay with part of the Ross of Mull.

page 169 note 1 Teall, J. J. H., British Petrography, 1888, p. 314.Google Scholar

page 169 note 2 Dale, T. N., Bull. U.S. Geol. Survey, 1908, no. 354, p. 56.Google Scholar

page 170 note 1 See Bowen, N. L., 1928, loc. cit., pp. 8-10.Google Scholar

page 171 note 1 Cargill, H. K., Hawkes, L., and Ledeboer, J. A., 1928, loc. cit., p. 528.Google Scholar

page 172 note 1 Some authors use ‘glomero-porphyritic’ for monomineralic clusters, but this is not universal, neither is it the original sense in which the term was used by Judd, J. W., (Quart. Journ. Geol. Soe. London, 1886, vol. 42, p. 71).Google Scholar A similar confusion exists regarding the term ‘cumulophyrie’, which has been adopted for clusters of more than one mineral ( Holmes, A., Petrographical methods, 1921, p. 343 Google Scholar), although it was first applied to clusters of equant crystals (Cross, Iddings, Pirsson, and Washington, Journ. Geol. Chicago, 1906, vol. 14, p. 703).

page 172 note 2 The geological structure of the north-west Highlands of Scotland. Mem. Geol. Survey, 1907, p. 65.