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Notes on the Ultrabasic Body of Unst, Shetland Islands

Published online by Cambridge University Press:  01 May 2009

M. S. Amin
M. S. Amin
Affiliation:
Department of Geology, Imperial College, London, S.W.7.
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Abstract

Within the main serpentine of Unst, a lower peridotite layer, a dunite layer, and an upper pyroxenite layer can be distinguished. These three zones have transitional contacts which are marked by a primary mineral banding. Analyses of specimens from each zone are given and it is suggested that the layering is due to differentiation in situ. The zones dip steeply eastward and the base of the intrusion is cut off on the west by a thrust which is slightly oblique to the banding and locally cuts out the peridotite zone. Interior planes of dislocation are parallel to, or perpendicular to, the primary banding.

Type
Articles
Information
Geological Magazine , Volume 91 , Issue 5 , October 1954 , pp. 399 - 406
Copyright
Copyright © Cambridge University Press 1954

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References

REFERENCES

Amin, M. S., 1952. Metamorphic Differentiation of Talc-Magnesite-Chlorite Rocks in Shetland. Geol. Mag., lxxxix, 97–105.CrossRefGoogle Scholar
Phillips, F. C., 1927. The Serpentines and Associated Rocks and Minerals of the Shetland Islands. Quart. Journ. Geol. Soc., lxxxiii, 622–652.CrossRefGoogle Scholar
Read, H. H., 1934. The metamorphic geology of Unst, in the Shetland Islands. Quart. Journ. Geol. Soc., xc, 637–688.Google Scholar