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Phase relations in some tholeiitic lavas illustrated by the system R2O3–XO–YO–ZO2

Published online by Cambridge University Press:  05 July 2018

Brian G. Jamieson
Brian G. Jamieson*
Affiliation:
Grant Institute of Geology, University of Edinburgh
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Summary

In order to aid the graphical presentation of analyses of igneous rocks, a pseudo-quaternary system R2O3XO-YO-ZO2 has recently been used (O'Hara, 1968, fig. 4). To test its ability to present the analytical data of tholeiitic basalts, the analyses of selected lavas have been projected into the system and then sub-projected into two planes. Lines, which represent the loci of liquid compositions in certain isobaric, pseudo-univariant equilibria, have been drawn on the basis of the melting relations of the basalts. After reading the pseudo-ternary phase diagrams resulting from the sub-projections, some genetic aspects of the lavas of Kilauea and Mauna Loa are discussed from a phase equilibrium standpoint.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 289 , March 1970 , pp. 537 - 554
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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