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Fine-scale layering in igneous intrusions: a possible mechanism for a non-depositional origin

Published online by Cambridge University Press:  01 May 2009

R. Kanaris-Sotiriou
R. Kanaris-Sotiriou
Affiliation:
Department of GeologyThe UniversitySheffield
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Summary

Examination of layered rocks from the Currywongaun-Doughruagh Intrusion, Connemara, Eire, has suggested a possible connexion between adcumulate crystallization and the formation of thin, yet very persistent igneous layering. It is thought that as a result of adcumulate crystallization proceeding under undisturbed conditions near the top of a pile of cumulus crystals, a zone of liquid, supersaturated in those components not required for adcumulate growth, could be generated in the magma just above the cumulate pile. Crystallization from such a supersaturated zone would result in the cumulate phases, inter-directly beneath. The rhythmic deposition is lacking, could by this mechanism build up a sequence of cumulate layers interbedded with fine-scale layers of a non-depositional origin.

Type
Articles
Information
Geological Magazine , Volume 111 , Issue 2 , March 1974 , pp. 157 - 162
Copyright
Copyright © Cambridge University Press 1974

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