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Plagioclase-Ca-rich-nepheline intergrowths in a syenite from the Marangudzi complex, Rhodesia

Published online by Cambridge University Press:  05 July 2018

C. M. B. Henderson  and
F. G. F. Gibb
C. M. B. Henderson
Affiliation:
Department of Geology, The University, Manchester M13 9PL, England
F. G. F. Gibb
Affiliation:
Department of Geology, The University, Manchester M13 9PL, England
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Summary

Nepheline in a basic syenite from the Marangudzi complex is relatively Ca-rich with CaO from 1·9 to 2·4 (wt) %. This Ca-rich nepheline sometimes occurs in intimate intergrowths with plagioclase (andesine). These intergrowths are thought to have formed at temperatures in the order of 750°–850°C by resorption of plagioclase with simultaneous replacement by nepheline.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 298 , June 1972 , pp. 670 - 677
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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