Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-18T23:20:54.719Z Has data issue: false hasContentIssue false
  • English
  • Français

The Nature and Origin of the Groundmass Textures in Felsites and Granophyres from Rhum, Inverness-shire

Published online by Cambridge University Press:  01 May 2009

A. C. Dunham
A. C. Dunham
Affiliation:
Department of Geology, University of Durham.
Get access Rights & Permissions [Opens in a new window]

Abstract

Chemical and mineralogical data are presented to demonstrate the overall similarity between granophyre and felsite from Rhum. However, although the compositions of the groundmasses of the two rock-types are very similar their characteristic textures are quite different. The felsitic texture is shown to be the result of devitrification of a glass, whilst the granophyric texture is attributed to the simultaneous crystallization of quartz and feldspar on the cotectic line in the system Ab–Or–SiO2–H2O. An explanation of the formation of the different textures is given in terms of the degree of super-cooling experienced by separate intrusions of the same magma in contrasted environments.

Type
Articles
Information
Geological Magazine , Volume 102 , Issue 1 , February 1965 , pp. 8 - 23
Copyright
Copyright © Cambridge University Press 1965

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Bailey, E. B., 1945. Tertiary igneous tectonics of Rhum (Inner Hebrides). Quart. J. geol. Soc. Lond., 100, 165–191.CrossRefGoogle Scholar
Bell, J. D., 1959. The geology and petrology of the northern end of the Blaven Range, Isle of Skye. D.Phil, thesis, Oxford.Google Scholar
Black, G. P., 1954. The acid rocks of western Rhum. Geol. Mag., 91, 257–272.CrossRefGoogle Scholar
Buckley, H. E., 1951. Crystal Growth. New York: John Wiley.Google Scholar
Buddington, A. F., 1959. Granite emplacement with special reference to North America. Bull. geol. Soc. Amer., 70, 671–747.CrossRefGoogle Scholar
Emeleus, C. H., 1956. Studies of the granophyres and related rocks of the Slieve Gullion Tertiary Igneous Complex. D.Phil, thesis, Oxford.Google Scholar
Geikie, A., 1897. The ancient volcanoes of Great Britain, vol. 2. London: Macmillan and Co.CrossRefGoogle Scholar
Harker, A., 1908. The geology of the Small Isles of Inverness-shire. Mem. geol. Surv. U.K.Google Scholar
Hotz, P. E., 1953. Petrology of granophyre in diabase near Dillsburg, Pennsylvania. Bull. geol. Soc. Amer., 64, 675–704.CrossRefGoogle Scholar
Hughes, C. J., 1960. The Southern Mountains igneous complex, Isle of Rhum. Quart. J. geol. Soc. Lond., 116, 111–131.CrossRefGoogle Scholar
Judd, J. W., 1874. The Secondary rocks of Scotland. Quart. J. geol. Soc. Lond., 30, 220–301.CrossRefGoogle Scholar
Lacey, E. D., 1960. Melts of granitic composition, their structure, properties and behaviour. Rept. Int. geol. Cong. Norden., Part 14,7–15.Google Scholar
Leighton, M. W., 1954. Petrogenesis of a gabbro–granophyre complex in northern Wisconsin. Bull. geol. Soc. Amer., 65, 401–442.CrossRefGoogle Scholar
McDougall, I., 1962. Differentiation of the Tasmanian dolerites: Red Hill dolerite–granophyre association. Bull. geol. Soc. Amer., 73, 279–316.CrossRefGoogle Scholar
Marshall, R. R., 1961. Devitrification of natural glass. Bull. geol. Soc. Amer., 72, 1493–1520.CrossRefGoogle Scholar
Mullin, J. W., 1961. Crystallization. London: Butterworth.Google Scholar
Reynolds, D. L., 1950. The transformation of Caledonian granodiorite to Tertiary granophyre on Slieve Gullion, Co. Armagh, N. Ireland. Rept. Int. geol. Congr. Great Britain, Part 3, 1–11.Google Scholar
Reynolds, D. L. 1951. The geology of Slieve Gullion, Foughill and Carrickcarnan: an actualistic interpretation of a Tertiary gabbro–granophyre complex. Trans. Roy. Soc. Edin., 62, 85–142.CrossRefGoogle Scholar
Schiebold, E., 1930. Über den Feinbau der Feldspate. Zeits. f. Krist., 73, 90–95.Google Scholar
Tuttle, O. F., and Bowen, N. L., 1958. The origin of granite in the light of experimental studies in the system NaAlSi3O8–KAlSi3O8–SiO2–H2O. Mem. geol. Soc. Amer., 74.Google Scholar
Vogt, J. H. L., 1930. The physical chemistry of the magmatic differentiation of igneous rocks III Part 2. On the granitic rocks. Skr. Norske Vidensk. Akad., I Mat.-naturv, Kl., No. 8.Google Scholar
Wager, L. R., 1961. A note on the origin of ophitic texture in the chilled olivine gabbro of the Skaergaard intrusion. Geol. Mag., 98, 353–366.CrossRefGoogle Scholar
Walker, F., and Poldervaart, A., 1949. Karroo dolerites of the Union of South Africa. Bull. geol. Soc. Amer., 60, 591–706.CrossRefGoogle Scholar