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The Petrogenesis of Hornblende-mica-lamprophyre Dykes at South Hill, Jersey, C. I.

Published online by Cambridge University Press:  01 May 2009

A. C. Bishop
A. C. Bishop
Affiliation:
Department of Geology, Queen Mary College, Mile End Road, London, E. 1.
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Abstract

At South Hill, 1/2 mile south-east of St. Helier, two hornblende-mica-lamprophyre dykes cut the Fort Regent granophyre. They are themselves displaced by two gently dipping shear zones and a dolerite dyke belonging to the main Jersey dyke swarm cuts the granophyre, lamprophyres, and shears, Petrographically the lamprophyres are of the spessartite-kersantite type, but the presence of euhedral brown amphibole invites comparison with the camptonites. The genesis of the lamprophyres is discussed and a significant role is assigned to volatile constituents.

Type
Articles
Information
Geological Magazine , Volume 101 , Issue 4 , 24 August 1964 , pp. 302 - 313
Copyright
Copyright © Cambridge University Press 1964

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References

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