Abstract
Chemical composition of the Chiney mafic-ultramafic layered intrusion was studied in two main sections and from other rock types in the eastern part. All rocks, except norite, are enriched in Fe and Ti. The MgO and TiO2 variations demonstrate a rhythmic structure of the Chiney pluton. Distribution of rare elements in rocks is similar to the distribution in typical crustal rocks with negative Ta-Nb and positive Pb anomalies. Techniques of geochemical thermometry with the use of the COMAGMAT computer program allowed to estimate the phase and chemical composition of the parental magma. The Chiney magma was represented by differentiated suspension of olivine, plagioclase, and magnetite crystals in ferrobasaltic melt at a temperature of approximately 1130 °C. The gravitational separation of these phases in the melt before its emplacement into the chamber and during the subsequent emplacement of various portions of the initial magma into the modern chamber predetermined the heterogeneity of the pluton.
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Gongalsky, B., Krivolutskaya, N. (2019). Chemistry and General Typification of Intrusive Rocks. In: World-Class Mineral Deposits of Northeastern Transbaikalia, Siberia, Russia. Modern Approaches in Solid Earth Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-03559-4_6
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