Abstract
The four essential minerals of many potassium-rich mafic and ultramafic rocks are leucite, augite, olivine, and melilite. The bulk composition of these rocks thus lies within the phase volume of forsterite-diopside-akermanite-leucite (Fig. 2.1). A study of the system is thus applicable to the understanding of the phase relations and origin of potassium-rich mafic and ultramafic volcanic rocks. A detailed study of the system was made by Gupta (1972), who showed that all phases in this system are solid solutions. Forsterite may contain monticellite; diopside, and akermanite possibly incorporate Ca-Tschermak’s molecule and gehlenite respectively; leucite may include K2O · MgO · 5 SiO2 and monticellite probably contains forsterite. The four joins which bound the system are described below.
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© 1980 Springer-Verlag Berlin · Heidelberg
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Gupta, A.K., Yagi, K. (1980). The System Forsterite-Diopside-Akermanite-Leucite. In: Petrology and Genesis of Leucite-Bearing Rocks. Minerals and Rocks, vol 14. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-67550-8_10
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DOI: https://doi.org/10.1007/978-3-642-67550-8_10
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-67552-2
Online ISBN: 978-3-642-67550-8
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