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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

AUTHOR/S: O. BELOZEROVA, VL. MAKAGON
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 69-74 pp

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.

Keywords: pegmatite, cassiterite, Ta,Nb-oxide mineral inclusions, X-ray electron probe microanalysis.

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