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Mitchell, R. H., Belton, F. (2004) Niocalite-cuspidine solid solution and manganoan monticellite from natrocarbonatite, Oldoinyo Lengai, Tanzania. Mineralogical Magazine, 68 (5) 787-799 doi:10.1180/0026461046850219

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Reference TypeJournal (article/letter/editorial)
TitleNiocalite-cuspidine solid solution and manganoan monticellite from natrocarbonatite, Oldoinyo Lengai, Tanzania
JournalMineralogical Magazine
AuthorsMitchell, R. H.Author
Belton, F.Author
Year2004 (October)Volume68
Issue5
PublisherMineralogical Society
DOIdoi:10.1180/0026461046850219Search in ResearchGate
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Mindat Ref. ID243573Long-form Identifiermindat:1:5:243573:6
GUID0
Full ReferenceMitchell, R. H., Belton, F. (2004) Niocalite-cuspidine solid solution and manganoan monticellite from natrocarbonatite, Oldoinyo Lengai, Tanzania. Mineralogical Magazine, 68 (5) 787-799 doi:10.1180/0026461046850219
Plain TextMitchell, R. H., Belton, F. (2004) Niocalite-cuspidine solid solution and manganoan monticellite from natrocarbonatite, Oldoinyo Lengai, Tanzania. Mineralogical Magazine, 68 (5) 787-799 doi:10.1180/0026461046850219
Abstract/NotesAbstractLapilli and spatter of natrocarbonatite extruded from the T56B cone of Oldoinyo Lengai (Tanzania) in August 2003 are unusually rich in apatite, silicate, oxide and sulphide minerals. These minerals occur primarily within inclusions of quenched natrocarbonatite in gregoryite and fractures in nyerereite-gregoryite intergrowths. Silicates include members of the sodian cuspidine–niobian cuspidine–niocalite solid-solution series and manganoan monticellite. Oxides are represented by members of the magnesioferrite–jacobsite–magnetite solid-solution series. Sulphides occurring in decreasing order of abundance include: ferroan alabandite, manganoan ferroan sphalerite, galena and pyrrhotite. Petrographic and compositional data for these minerals are interpreted to indicate that all are high-temperature (<900–650°C), early-crystallizing phases from relatively-unevolved natrocarbonatite magma, with the sulphides forming prior to the silicates, and the latter before gregoryite. Sulphur fugacityand oxygen fugacity of natrocarbonatite magma are considered to decrease and increase, respectively, during the formation of the sulphide-oxide assemblage. Crystallization of cuspidine-niocalite, monticellite and Si-bearing apatite rapidly depletes natrocarbonatite magma of its initial low silica content, preventing crystallization of late-stage groundmass silicates.

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Ol Doinyo Lengai, Ngorongoro District, Arusha region, Tanzania

Mineral Pages

MineralCitation Details
Cuspidine
Niocalite

Mineral Occurrences

LocalityMineral(s)
Ol Doinyo Lengai, Ngorongoro District, Arusha region, Tanzania Cuspidine, Monticellite, Niocalite


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