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Hollow apatites in a layered basic intrusion, Norway

Published online by Cambridge University Press:  01 May 2009

P. M. Gardner
P. M. Gardner
Affiliation:
Geologisk Institutt, Avd. A, Universitetet i Bergen, Norway
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Summary

Cumulate apatite crystals with infilled tube-like cavities parallel to the c-axis are described from a layered gabbro intrusion in Northern Norway. These are considered to be skeletal crystals produced by rapid growth in the supercooled roof zone of the magma chamber. At least two stages of growth are suggested on the basis of the morphology of the apatites. The interiors of the crystals contain phases representing the trapped magma or the cumulus mineral phase within which they are enclosed. Recirculation of the apatite primocrysts by convection currents is indicated by the interrupted form of some of the tubes.

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Type
Articles
Information
Geological Magazine , Volume 109 , Issue 5 , September 1972 , pp. 385 - 392
Copyright
Copyright © Cambridge University Press 1972

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