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Mineral Chemistry of Leucitites from Visoke Volcano (Virunga Range, Rwanda): Petrogenetic Implications

Published online by Cambridge University Press:  05 July 2018

G. Marcelot  and
J. Ph. Rançon
G. Marcelot
Affiliation:
Laboratoire de Pétrologie, Université de Bretagne Occidentale 29287 Brest Cedex, France
J. Ph. Rançon
Affiliation:
Bureau de Recherches Géologiques et Minières, Département Géologie, BP 6009, 45060 Orléans Cedex, France
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Abstract

The Visoke complex is one of the main Quaternary volcanic centres of the Virunga Range, located north of lake Kivu. Mineralogical (microprobe) data are given for two representative leucitite lavas; one sample contains a complex coarse-grained xenolith (phlogopite, diopside, leucite, titanomagnetite, perovskite and apatite) and megacrysts of pyroxene, phlogopite and olivine scattered in fine-grained leucite-rich host lava. Compared with the typical leucite-dominated, low-pressure phenocryst assemblage of the two samples studied, the chemical trends of ferromagnesian crystals suggest an earlier igneous event (high-pressure phenomenon) strongly related to the leucite-bearing magma suite.

Keywords

mineral chemistryleucititesVisoke VolcanoRwanda
Type
Petrology and Geochemistry
Information
Mineralogical Magazine , Volume 52 , Issue 368 , December 1988 , pp. 603 - 613
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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