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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.

References

Bahat, (D.), 1974. Am. Mineral. 59, 139-42.Google Scholar
Bence, (A. E.) and Albee, (A. L.), 1968. J. Geol. 76, 382403.CrossRefGoogle Scholar
Carmichael, (I. S. E.), 1963. Q. J. Geol. Soc. 119, 95131.CrossRefGoogle Scholar
Dickson, (F. W.), 1968. Abstr. in Geol. Soc. Am. Ann. Meet., Mexico City, 74-5.Google Scholar
Evans, (H. T.), Appleman, (D. E.), and Handwerker, (D. S.), 1963. Abstr. in Am. Crystallogr. Assoc. Ann. Meet., Cambridge, 42-3 .Google Scholar
Kastner, (M.) and Waldbaum, (D. R.), 1968. Am. Mineral. 53, 1574-602.Google Scholar
Kerrick, (D. M.), 1969. Am. Mineral. 54, 839-48.Google Scholar
Laves, (F.) and Goldsmith, (J. R.), 1961. Cursillos y Conferencias Inst. ‘Lucas Mallada’, 8, 7080.Google Scholar
Luth, (W. C.), 1969. Am. J. Sci. 267A, 325-41.Google Scholar
Luth, (W. C.), Jahns, (R. H.) and Tuttle, (D. F.), 1964. J. Geophys. Res. 69, 759-73.CrossRefGoogle Scholar
Oftedal, (I.), 1959. Norsk Geol. Tidsskr. 39, 343-9.Google Scholar
Piveç, (E.), 1969. Acta Univ. Carol., ser. geol., n. 1, 1125.Google Scholar
Presnall, (D. C.) and Bateman, (P. C.), 1973. Geol. Soc. Am. Bull. 84, 3181-2O2.2.0.CO;2>CrossRefGoogle Scholar
Scherrnerhorn, (L. J. G.), 1956. Am. J. Sci. 254, 329-45.CrossRefGoogle Scholar
Smith, (J. V.), 1974. Feldspar Minerals, 2, Springer-Verlag, New York.Google Scholar
Stewart, (D. B.) and Wright, (T. L.), 1974. Bull. Soc. fr. Minéral. Crystallogr. 97, 356-77.Google Scholar
Taylor, (S. R.) and Heier, (K. S.), 1960. Int. Geol. Congress, 21st session, pt. 14, 47-61.Google Scholar
Wright, (T. L.) and Stewart, (D. B.), 1968. Am. Mineral. 53, 3887.Google Scholar