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Crystallization history of sector-zoned microcline megacrysts from the Godani Valley pluton, Nigeria

Published online by Cambridge University Press:  05 July 2018

David Vaniman
Affiliation:
Board of Earth Sciences, University of California, Santa Cruz, California 95064

Summary

Sector-zoning is brought out by mineral inclusions (plagioclase, biotite, hornblende, sphene, and apatite) in 2 to 5 cm microcline megacrysts of the Godani Valley pluton, Nigeria. The inclusions are concentrated in the megacryst rims beneath the faces {110} and {20}; the megacryst cores are not sector-zoned. Comparison with other occurrences (Portugal and Czechoslovakia) shows that this type of sector-zoning is not controlled by growth rate. Chemical sector-zoning does not occur in the Godani megacrysts. Growth from magma is proposed, with preference for inclusions on faces at a high angle to the feldspar a-chain. A superficially similar type of sector-zoning occurs in microcline megacrysts of both pluton and wall rock at Papoose Flat, California, suggesting that this feature can be generated either by growth from magma or by replacement.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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Footnotes

1

Present address: Department of Earth and Space Sciences, State University of New York, Stony Brook, New York 11794.

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