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INVESTIGATION OF CASSITERITES AND THEIR COLUMBITE-TANTALITE INCLUSIONS IN RARE METAL PEGMATITES OF THE EAST SAYAN BELT BY X-RAY ELECTRON PROBE MICROANALYSIS
Abstract
The X-ray electron probe microanalysis (EPMA) technique is developed for cassiterites and minerals of Ta and Nb. The phase and chemical composition of rare metal pegmatite cassiterites of the East Sayan Belt and their inclusions of Ta and Nb minerals were studied using the EPMA technique. The results of cassiterite investigations showed, that niobium and tantalum are contained both in isomorphous form, substituting the tin in the matrix of mineral and as mineral inclusions of columbitetantalites. The distribution of Ta and Nb is frequently irregular in the matix of cassiterite and Ta significantly predominates over Nb. The significant variations of Ta and Nb contents are observed in cassiterites from pegmatites of various derivative geochemical sequences and paragenetic types. The detailed study of Ta,Nb-oxide mineral chemical composition indicated the features of their compositional variations in the process of rare metal pegmatite formation in different pegmatite fields of the East Sayan Belt.
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References8
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