Hostname: page-component-8448b6f56d-42gr6 Total loading time: 0 Render date: 2024-04-23T17:48:25.198Z Has data issue: false hasContentIssue false
  • English
  • Français

The Composite Sill of Rudh' a' Chromain, Carsaig, Mull

Published online by Cambridge University Press:  01 May 2009

D. S. Buist
D. S. Buist
Affiliation:
14 Westley Avenue, Whitley Bay, Northumberland.
Get access Rights & Permissions [Opens in a new window]

Abstract

The sill shows the normal type of spatial relationship found in composite intrusions of the British Tertiary, i.e. basic-acid-basic. The basic rocks are Talaidh type tholeiites while the acid rock is a rhyolite. Xenoliths appear to be concentrated in the upper and lower tholeiites. This fact has suggested to the authors of the Mull Memoir that a process of gravitational differentiation resulted in the formation of the basic and acid magmas. The evidence is inconclusive as to what process operated in magma genesis. The mineralogy of the xenoliths found in the sill is described in detail.

Type
Articles
Information
Geological Magazine , Volume 98 , Issue 1 , February 1961 , pp. 67 - 76
Copyright
Copyright © Cambridge University Press 1961

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

Bailey, E. B. et al. , 1924. Tertiary and post-Tertiary geology of Mull, Loch Aline and Oban. Mem. Geol. Surv. Scotland.Google Scholar
Bowen, N. L., Greig, J. W., and Zies, E. G., 1924. Mullite, a silicate of alumina. Journ. Washington Acad, Sci., xiv, 183–191.Google Scholar
Buist, D. S., 1958. The bostonite of Rudh' a' Chromain, Carsaig, Mull. Geol. Mag., xcv, 463–464.CrossRefGoogle Scholar
George, W. O., 1924. The relation of the physical properties of natural glasses to their chemical composition. Journ. Geol., xxxii, 353–372.CrossRefGoogle Scholar
Hess, H. H., 1949. Chemical composition and optical properties of common clinopyroxenes. Amer. Mm., xxxiv, 621–666.Google Scholar
Thomas, H. H., 1922. On certain xenolithic Tertiary minor intrusions in the island of Mull (Argyllshire). Quart. Journ. Geol. Soc., lxxviii, 219–260.Google Scholar