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The Pen-y-gader Dolerite and its Metasomatic Effects on the Llyn-y-gader Sediments

Published online by Cambridge University Press:  01 May 2009

R. G. Davies
R. G. Davies
Affiliation:
Department of Geology, University College of Wales, Aberystwyth.
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Abstract

A petrochemical study of the Pen-y-Gader dolerite has been made. The intrusion produced a mild thermal metamorphism in the country sediments and then a late-stage metasomatism affecting the dolerite as well as producing spilosites and adinoles in the country rocks. The main metasomatism involved the introduction of sodium with small amounts of boron and fluorine into the sediments. The range of activity beneath the intrusion was governed by the porosity of the sediments affected, coarsegrained bands being followed for greater distances. The chemical and mineralogical variations within the dolerite have also been compared with those observed in certain of its ophitic neighbours.

Type
Articles
Information
Geological Magazine , Volume 93 , Issue 2 , April 1956 , pp. 153 - 172
Copyright
Copyright © Cambridge University Press 1956

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References

List Of References

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