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The origin of a Pre-Cambrian diorite-granite plutonic series from Pembrokeshire (Wales)

Published online by Cambridge University Press:  01 May 2009

R. S. Thorpe
R. S. Thorpe
Affiliation:
Department of Earth Sciences, The Open University, Walton Hall, Walton Bletchley, Buckinghamshire
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Summary

A series of dioritic, granodioritic and granitic igneous rocks, of Pre-Cambrian age, is exposed near Johnston in south Pembrokeshire. Chemical analyses of representative rocks show the suite to be of calcalkaline type. An origin is suggested involving magmatic differentiation of a diorite parent magma, and the granitic rocks are compared with a granophyre of similar composition in north Pembrokeshire.

Type
Articles
Information
Geological Magazine , Volume 107 , Issue 6 , November 1970 , pp. 491 - 499
Copyright
Copyright © Cambridge University Press 1970

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