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Crystallization history of a zoned plagioclase

Microprobe analysis of zoned plagioclase from the Grand Manan tholeiite sheet

Published online by Cambridge University Press:  05 July 2018

G. J. Pringle ,
L. T. Trembath  and
G. E. Pajari Jr.
G. J. Pringle
Affiliation:
University of New Brunswick, Fredericton, New Brunswick, Canada
L. T. Trembath
Affiliation:
University of New Brunswick, Fredericton, New Brunswick, Canada
G. E. Pajari Jr.
Affiliation:
University of New Brunswick, Fredericton, New Brunswick, Canada
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Summary

Electron microprobe and textural data are used to deduce a crystallization history for plagioclase in the Grand Manan Island (Canada) diabase sheet. The plagioclase crystals consist of a prominent core (An79-67) surrounded by a distinctly more calcic zone (An82-76), which grades into a normally zoned mantle (An73-40). This zoning pattern is interpreted as reflecting the elevation of a dry diabase magma from at least 10 to 20 km to near surface conditions.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 308 , December 1974 , pp. 867 - 877
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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Footnotes

1

Present address—Geological Survey of Canada.

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