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Sharygin, Victor V.; Doroshkevich, Anna G.
Journal of the Geological Society of India, 11/2017, Volume: 90, Issue: 5Journal Article
Secondary multiphase inclusions were studied in olivine from olivine-pyrochlore varieties of calcite carbonatites of the Belaya Zima alkaline complex, Eastern Sayan, Siberia, Russia. The inclusions form trails cross-cutting the host olivine. Their composition varies from carbonate to silicate-carbonate species. Multiphase silicate-carbonate inclusions contain Na-Ca-carbonates (shortite, nyerereite), Na-Mg-carbonates (northupite, eitelite, bradleyite), common carbonates (calcite, dolomite), Ba-Sr-rich carbonates (olekminskite, burbankite, strontianite), tetraferriphlogopite, magnetite, humite-clinohumite and other mineral phases. Na-Ca-carbonates, tetraferriphlogopite, humiteclinohumite and magnetite are omnipresent and dominant phases within the inclusions. The phase composition of secondary olivinehosted inclusions seems to reflect evolutionary features for the Belaya Zima carbonatites at their late stages of formation. During crystallization calciocarbonatite melt gradually evolved toward enrichment in alkalis (mainly, in sodium) and volatile components (Cl, F and H 2 O).
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