Abstract
The paper presents data on the chemical composition of pyroxenes from ultrabasic and alkaline rocks of Inagli massif (Aldan Shield). It is found that the composition of pyroxenes of a series of chromium-bearing diopside—diopside—aegirine changes from early to late differentiates in accordance with the evolution of the magmatic melt from which the rocks crystallized as a result of fractional crystallization. It is shown that crystallization differentiation was the main mechanism of dunite formation in the Inagli massif. Separation of the early crystallized phase of dunites led to the accumulation of a more alkaline residual melt from which alkaline-basic and alkaline rocks of the Inagli massif were formed as a result of fraction crystallization. Part of the residual interstitial melt was pressed into cooling cracks or formed in situ as small veins and nests of chromium-bearing diopside. The main series of bodies of chromium-bearing diopside pyroxenites, in some places enriched with phlogopite, was formed by the introduction of pyroxenite residual melt on large cracks formed in dunites after their crystallization. The magmatic scheme of sequential crystallization of rocks of the massif is proposed.
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Radomskaya, T.A., Vladykin, N.V., Kaneva, E.V. (2021). Chemical Compositional Variation of Clinopyroxenes of Alkaline-Ultrabasic and Alkaline Rocks of the Inagli Massif. In: Vladykin, N. (eds) Alkaline Rocks, Kimberlites and Carbonatites: Geochemistry and Genesis. Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-69670-2_7
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