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Dawson, J. B., Smith, J. V., Steele, I. M. (1992) 1966 ash eruption of the carbonatite volcano Oldoinyo Lengai: mineralogy of lapilli and mixing of silicate and carbonate magmas. Mineralogical Magazine, 56 (382) 1-16 doi:10.1180/minmag.1992.056.382.01

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Reference TypeJournal (article/letter/editorial)
Title1966 ash eruption of the carbonatite volcano Oldoinyo Lengai: mineralogy of lapilli and mixing of silicate and carbonate magmas
JournalMineralogical MagazineISSN0026-461X
AuthorsDawson, J. B.Author
Smith, J. V.Author
Steele, I. M.Author
Year1992 (March)Volume56
Issue382
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_56/56-382-1.pdf+
DOIdoi:10.1180/minmag.1992.056.382.01Search in ResearchGate
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Mindat Ref. ID1780Long-form Identifiermindat:1:5:1780:4
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Full ReferenceDawson, J. B., Smith, J. V., Steele, I. M. (1992) 1966 ash eruption of the carbonatite volcano Oldoinyo Lengai: mineralogy of lapilli and mixing of silicate and carbonate magmas. Mineralogical Magazine, 56 (382) 1-16 doi:10.1180/minmag.1992.056.382.01
Plain TextDawson, J. B., Smith, J. V., Steele, I. M. (1992) 1966 ash eruption of the carbonatite volcano Oldoinyo Lengai: mineralogy of lapilli and mixing of silicate and carbonate magmas. Mineralogical Magazine, 56 (382) 1-16 doi:10.1180/minmag.1992.056.382.01
In(1992, March) Mineralogical Magazine Vol. 56 (382) Mineralogical Society
Abstract/NotesAbstractLapilli from the August 1966 eruption of the carbonatite volcano Oldoinyo Lengai consist of carbonate-cemented aggregates of (i) mono- and poly-mineralic fragments of ijolitic rocks, (ii) single grains and clusters of euhedral nepheline, Ti-andradite, and Ti-magnetite, and (iii) corroded pyroxene and wollastonite grains surrounded by coronas containing combeite, melilite, Ca-silicates (possibly larnite and rankinite), and rounded bodies of submicrometre intergrowths with complex bulk compositions dominated by Na,K,Ca-phosphate-carbonate and alkali-iron-sulphide-carbonate. The (ii,iii) materials, together with abundant Na-carbonate, sylvite and fluorite occurring as cement and shells in the lapilli, are attributed to mixing and incomplete reaction of ijolite and carbonatite magmas during the explosive eruption. The rounded submicrometre intergrowths are interpreted as the quench products of two types of immiscible liquids whose properties should be studied by controlled synthesis.

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Mitchell, R. H., Dawson, J. B. (2007) The 24th September 2007 ash eruption of the carbonatite volcano Oldoinyo Lengai, Tanzania: mineralogy of the ash and implications for formation of a new hybrid magma type. Mineralogical Magazine, 71 (5) 483-492 doi:10.1180/minmag.2007.071.5.483
DAWSON, J. B., SMITH, J. V., STEELE, I. M. (1995) Petrology and Mineral Chemistry of Plutonic Igneous Xenoliths from the Carbonatite Volcano, Oldoinyo Lengai, Tanzania. Journal of Petrology, 36 (3) 797-826 doi:10.1093/petrology/36.3.797
Dawson, J. B. (1993) A supposed sövite from Oldoinyo Lengai, Tanzania: result of extreme alteration of alkali carbonatite lava. Mineralogical Magazine, 57 (386) 93-101 doi:10.1180/minmag.1993.057.386.09
Dawson, J. B. (1971) A preliminary note on eucolite from Oldoinyo Lengai, Tanzania. Mineralogical Magazine, 38 (295) 385 doi:10.1180/minmag.1971.038.295.19
Dawson, J. B., Pinkerton, H., Pyle, D. M., Nyamweru, C. (1994) June 1993 eruption of Oldoinyo Lengai, Tanzania: Exceptionally viscous and large carbonatite lava flows and evidence for coexisting silicate and carbonate magmas. Geology, 22 (9) 799 doi:10.1130/0091-7613(1994)022<0799:jeoolt>2.3.co;2
Dawson, J. B., Bowden, P., Clark, G. C. (1968) Activity of the carbonatite volcano Oldoinyo Lengai, 1966. Geologische Rundschau, 57 (3) 865-879 doi:10.1007/bf01845369
Mitchell, R. H. (2006) An ephemeral pentasodium phosphate carbonate from natrocarbonatite lapilli, Oldoinyo Lengai, Tanzania. Mineralogical Magazine, 70 (2) 211-218 doi:10.1180/0026461067020326
Dawson, J. B., Steele, I. M., Smith, J. V., Rivers, M. L. (1996) Minor and trace element chemistry of carbonates, apatites and magnetites in some African carbonatites. Mineralogical Magazine, 60 (400) 415-425 doi:10.1180/minmag.1996.060.400.03
Mitchell, Roger H. (1997) Carbonate-carbonate immiscibility, neighborite and potassium iron sulphide in Oldoinyo Lengai natrocarbonatite. Mineralogical Magazine, 61 (409) 779-789 doi:10.1180/minmag.1997.061.409.03
Gittins, J., Jago, B. C. (1998) Differentiation of natrocarbonatite magma at Oldoinyo Lengai volcano, Tanzania. Mineralogical Magazine, 62 (6) 759-768 doi:10.1180/002646198548142
Jago, B. C., Gittins, J. (1999) Mn- and F-bearing rasvumite in natrocarbonatite at Oldoinyo Lengai volcano, Tanzania. Mineralogical Magazine, 63 (1). 53-55 doi:10.1180/002646199548303
 
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