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Intercumulus igneous layering in the Kalka Layered Intrusion, central Australia

Published online by Cambridge University Press:  01 May 2009

A. D. T. Goode
A. D. T. Goode
Affiliation:
BHP Melbourne Research Laboratories, Wellington Road, Clayton, Victoria 3168, Australia
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Summary

Igneous layering resulting from variations in intercumulus mineralogy has been observed in the Kalka Intrusion in central Australia. The layering is parallel to cumulus layering, and is outlined by a mottled heteradcumulus ‘clump’ texture in leucogabbros, which occur in a generally adcumulate anorthositic sequence. Such intercumulus layering is thought to originate in slow cooling intrusions at times of slow crystal accumulation and/or relatively high rates of intercumulus crystallization when a zone of melt supersaturation (the cumulus nucleation zone) rises above the intrusion floor leaving the intercumulus melt undersaturated with respect to the settled cumulus phases. Adcumulates are produced when the supersaturated zone is coincident with the top of the crystal pile. The morphological elongation of clump plates parallel to the gross layering is probably controlled by the cumulus plagioclase fabric which tends to be planar laminate.

Type
Articles
Information
Geological Magazine , Volume 114 , Issue 3 , May 1977 , pp. 215 - 218
Copyright
Copyright © Cambridge University Press 1977

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