| Reference Type | Journal (article/letter/editorial) |
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| Title | Mineral chemistry of a peralkaline combeite-lamprophyllite nephelinite from Oldoinyo Lengai, Tanzania |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Dawson, J. B. | Author |
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| Hill, P. G. | Author |
| Year | 1998 (April) | Volume | 62 |
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| Issue | 2 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_62/62-2-179.pdf+ |
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| DOI | doi:10.1180/002646198547567Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 261 | Long-form Identifier | mindat:1:5:261:3 |
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| GUID | 0 |
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| Full Reference | Dawson, J. B., Hill, P. G. (1998) Mineral chemistry of a peralkaline combeite-lamprophyllite nephelinite from Oldoinyo Lengai, Tanzania. Mineralogical Magazine, 62 (2) 179-196 doi:10.1180/002646198547567 |
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| Plain Text | Dawson, J. B., Hill, P. G. (1998) Mineral chemistry of a peralkaline combeite-lamprophyllite nephelinite from Oldoinyo Lengai, Tanzania. Mineralogical Magazine, 62 (2) 179-196 doi:10.1180/002646198547567 |
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| In | (1998, April) Mineralogical Magazine Vol. 62 (2) Mineralogical Society |
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| Abstract/Notes | AbstractA peralkaline nephelinite lava ([Na+K]/Al 2.15) from the active carbonatite volcano Oldoinyo Lengai, contains combeite, Ba lamprophyllite, a phase with affinities to delhayelite, CeSrNb perovskite, a CaNa phosphate high in Sr, Ba and K, and peralkaline glass; in addition to Fe-rich nepheline, aegirine-rich clinopyroxene and FeK-rich sodalite. The high alkali concentrations relative to alumina in the bulk rock could not have been achieved by fractionational crystallisation of the known Al-rich phenocryst phases (nepheline and sodalite) and some other process must be invoked. |
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