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The origin of rhythmic layering

Published online by Cambridge University Press:  05 July 2018

Sven Maaløe
Sven Maaløe*
Affiliation:
Geologisk Institutt, Realfagbygget, University of Bergen, 5014 Bergen, Norway
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Summary

Rhythmic layering in the Skaergaard intrusion shows variation in crystal size and in modal proportions of primocrysts with structural height. These changes are ascribed to variations in nucleation rates of primocrysts. The nucleation theory requires that crystallization occurs under supercooled conditions, and that the crystallization of one primocryst phase may change the composition of the magma in such a manner that the nucleation rates of other primocrysts are influenced. Both these constraints appear to have been fulfilled for the Skaergaard intrusion.

Type
Research Article
Information
Mineralogical Magazine , Volume 42 , Issue 323 , September 1978 , pp. 337 - 345
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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