Mineralogy of secondary olivine-hosted inclusions in calcite carbonatites of the Belaya Zima alkaline complex, Eastern Sayan, Russia: Evidence for late-magmatic Na-Ca-rich carbonate composition

Victor V. Sharygin, Anna G. Doroshkevich

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

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 H2O).

Original languageEnglish
Pages (from-to)524-530
Number of pages7
JournalJournal of the Geological Society of India
Volume90
Issue number5
DOIs
Publication statusPublished - 1 Nov 2017

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