Hostname: page-component-848d4c4894-cjp7w Total loading time: 0 Render date: 2024-07-07T22:21:13.535Z Has data issue: false hasContentIssue false
  • English
  • Français

The Acid Rocks of Western Rhum

Published online by Cambridge University Press:  01 May 2009

George P. Black
George P. Black
Affiliation:
Grant Institute of Geology, The University of Edinburgh.
Get access Rights & Permissions [Opens in a new window]

Abstract

In the west of the Isle of Rhum (Inverness-shire), Tertiary acid rocks outcrop over an area of approximately 6 square miles. A core of spherulitic microgranite is surrounded by graphpphyre1 which, in turn, is bounded on the north by Torridonian Sandstone; although much of the boundary is marked by a low-angle reverse fault, part of the junction is undisturbed and a belt of transitional rocks, some 1,400 feet in width, intervenes between the graphophyre and the Torridonian Sandstone. The transitional rocks are divisible into five zones which are interpreted as marking successive stages in the conversion of sandstone into graphophyre. Evidence is presented indicating that the microgranite, into which the graphophyre grades inwards, represents a still more advanced stage of transformation.

Type
Articles
Information
Geological Magazine , Volume 91 , Issue 4 , August 1954 , pp. 257 - 272
Copyright
Copyright © Cambridge University Press 1954

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. In The Tertiary igneous tectonics of Rhum, Inner Hebrides. Quart. Journ. Geol. Soc., c, 165–188.Google Scholar
Black, G. P., 1952 a. The age-relationship of the granophyre and basalt of Orval, Isle of Rhum. Geol. Mag., lxxxix, 106–112.CrossRefGoogle Scholar
Black, G. P. 1952 b. The Tertiary volcanic succession of the Isle of Rhum, Inverness-shire. Trans. Edin. Geol. Soc., xv, 39–51.CrossRefGoogle Scholar
Clough, C. T. et al. , 1910. The geology of Glenelg, Lochalsh, and the south-east part of Skye. Mem. Geol. Surv. Scotland, p. 59.Google Scholar
Geikie, A., 1897. The Ancient Volcanoes of Great Britain. Edinburgh. Vol. ii, p. 403.CrossRefGoogle Scholar
Harker, A., 1908. The geology of the Small Isles of Inverness-shire. Mem.Geol. Surv. Scotland.Google Scholar
Judd, J. W., 1874. The Secondary rocks of Scotland. Second Paper. Quart. Journ. Geol. Soc., xxxiv.Google Scholar
Kennedy, W. Q., 1951. Sedimentary differentiation as a factor in the Moine-Torridonian correlation. Geol. Mag., lxxxviii, 258.Google Scholar
King, B. C., 1953. Structure and igneous activity in the Creag Strollamus area of Skye. Trans. Roy. Soc. Edin., lxii, 388–9, 391–3.Google Scholar
MacCulloch, J., 1819. A Description of the Western Isles of Scotland. London. Vol. i, p. 487.Google Scholar
Reynolds, D. L., 1946. The sequence of geochemical changes leading to granitization. Quart. Journ. Geol. Soc., cii, 389–446.CrossRefGoogle Scholar