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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.
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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

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References

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