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The crystallization of the teschenite from the Lugar Sill, Ayrshire

Published online by Cambridge University Press:  01 May 2009

W. J. Phillips
W. J. Phillips
Affiliation:
Department of Geology, University College of Wales, Llandinam Building, Aberystwyth.
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Summary

Twelve stages in the crystallization of the teschenite are defined by the commencement or cessation of crystallization of particular minerals. Ocellar structures, outlined by tangentially arranged biotite flakes, developed in liquid pockets after the sill had begun to consolidate, due to the coalescence of crystalline masses. It is thought that these ocellar structures were formed by the growth of gas bubbles and that this caused the expansion and fracturing of the partially consolidated sill. It is argued that the separation of the gas phase was the result of a retrograde increase in the vapour pressure during crystallization.

Type
Articles
Information
Geological Magazine , Volume 105 , Issue 1 , February 1968 , pp. 23 - 34
Copyright
Copyright © Cambridge University Press 1968

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References

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