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Crescumulate layering in a gabbroic body on Seiland, northern Norway

Published online by Cambridge University Press:  01 May 2009

B. Robins
B. Robins*
Affiliation:
Geologisk Institutt, Avd. A, Universitetet i Bergen, Norway
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Summary

The cumulates and crescumulates in the Crescumulate Zone of the Rognsund gabbro are described. The olivine and olivine-clinopyroxene crescumulates contain large dendritic crystals of olivine due to rapid upward growth from cumulus nucleii on the temporary floor of the magma chamber. Crescumulate growth was accompanied by the bottom accumulation of primocrysts, some of which were enlarged by the normal adcumulus process. The crescumulates are thought to have originated when cumulus crystals sank from a labile environment near the roof of the body into a metastable environment on the floor.

Type
Research Article
Information
Geological Magazine , Volume 109 , Issue 6 , November 1972 , pp. 533 - 542
Copyright
Copyright © Cambridge University Press 1972

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