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Russian Geology and Geophysics

2009 year, number 11

Application of thermomagnetic analysis to picroilmenite investigation

Sh.Z. Ibragimov a , S.G. Mishenin b
a Kazan State University, 18 ul. Kremlevskaya, Kazan, 420111, Russia
b Sobolev Institute of Geology and Mineralogy, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: picroilmenite; thermomagnetic analysis; kimberlite; Curie point
Pages: 966-972


Picroilmenite samples from five kimberlite pipes of the Yakutian kimberlite province have been studied. Point microprobe analyses of two mutually perpendicular profiles of each sample were carried out to study the compositional inhomogeneity of picroilmenite. Thermomagnetic curves were also recorded for each sample. A model for the processing of thermomagnetic curves is proposed on the basis of the relationship between the Curie point of picroilmenite and the content of the hematite end-member. The compositions determined by the thermomagnetic curves and microprobe analysis are rather similar. The conclusion has been drawn that thermomagnetic analysis can be used for the rapid determination of the picroilmenite composition. The possibilities and restrictions of this method are shown.