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Mineralogy of vesicles in an olivine leucitite at Cosgrove, Victoria, Australia

Published online by Cambridge University Press:  05 July 2018

W. D. Birch
W. D. Birch*
Affiliation:
Department of Mineralogy, National Museum of Victoria, Russell Street, Melbourne, Victoria. 3000
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Summary

An olivine-titanomagnetite-apatite-clinopyroxene-mica-nepheline-feldspar assemblage occurs in late-stage vesicles in a small outcrop of olivine leucitite at Cosgrove, Victoria. The vesicles were formed by exsolution of volatiles at an early stage in the cooling history of the lava. Subsequently, a volatile-rich residual liquid filled cavities and fractures, giving rise to a coarse-grained pegmatoid rock type similar in over-all mineralogy to the vesicles. The volatiles facilitating crystallization in both the vesicles and the pegmatoid were probably enriched in F, CO2, and P. A number of geothermometers applied to the vesicle assemblage failed to agree on likely crystallization temperatures.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 329 , March 1980 , pp. 597 - 603
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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