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Platt, R. G., Wall, F., Williams, C. T., Woolley, A. R. (1987) Zirconolite, chevkinite and other rare earth minerals from nepheline syenites and peralkaline granites and syenites of the Chilwa Alkaline Province, Malawi. Mineralogical Magazine, 51 (360) 253-263 doi:10.1180/minmag.1987.051.360.07

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Reference TypeJournal (article/letter/editorial)
TitleZirconolite, chevkinite and other rare earth minerals from nepheline syenites and peralkaline granites and syenites of the Chilwa Alkaline Province, Malawi
JournalMineralogical MagazineISSN0026-461X
AuthorsPlatt, R. G.Author
Wall, F.Author
Williams, C. T.Author
Woolley, A. R.Author
Year1987 (June)Volume51
Issue360
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_51/51-360-253.pdf+
DOIdoi:10.1180/minmag.1987.051.360.07Search in ResearchGate
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Mindat Ref. ID1378Long-form Identifiermindat:1:5:1378:3
GUID0
Full ReferencePlatt, R. G., Wall, F., Williams, C. T., Woolley, A. R. (1987) Zirconolite, chevkinite and other rare earth minerals from nepheline syenites and peralkaline granites and syenites of the Chilwa Alkaline Province, Malawi. Mineralogical Magazine, 51 (360) 253-263 doi:10.1180/minmag.1987.051.360.07
Plain TextPlatt, R. G., Wall, F., Williams, C. T., Woolley, A. R. (1987) Zirconolite, chevkinite and other rare earth minerals from nepheline syenites and peralkaline granites and syenites of the Chilwa Alkaline Province, Malawi. Mineralogical Magazine, 51 (360) 253-263 doi:10.1180/minmag.1987.051.360.07
In(1987, June) Mineralogical Magazine Vol. 51 (360) Mineralogical Society
Abstract/NotesAbstractFive rare earth-bearing minerals found in rocks of the Chilwa Alkaline Province, Malawi, are described. Zirconolite, occurring in nepheline syenite, is unusual in being optically zoned, and microprobe analyses indicate a correlation of this zoning with variations in Si, Ca, Sr, Th, U, Fe, Nb and probably water; it is argued that this zoning is a hydration effect. A second compositional zoning pattern, neither detectable optically nor affected by the hydration, is indicated by variations in Th, Ce and Y such that, although total REE abundances are similar throughout, there appears to have been REE fractionation during zirconolite growth from relatively heavy-REE and Th-enrichment in crystal cores to light-REE enrichment in crystal rims.Chevkinite is an abundant mineral in the large granite quartz syenite complexes of Zomba and Mulanje, and analyses are given of chevkinites from these localities. There is little variation in composition within each complex, and only slight differences between them; they are all typically light-REE-enriched. The Mulanje material was shown by X-ray diffraction to be chevkinite and not the dimorph perrierite, but chemical arguments are used in considering the Zomba material to be the same species. Other rare earth minerals identified are monazite, fluocerite and bastnΓ€site. These are briefly described and microprobe analyses presented.

Map of Localities

Locality Pages

LocalityCitation Details
Mlanje Massif, Mulanje, Southern Region, Malawi
Zomba-Malosa Complex, Southern Region, Malawi

Mineral Occurrences

LocalityMineral(s)
Mlanje Massif, Mulanje, Southern Region, Malawiβ“˜ Aegirine, β“˜ Aegirine-augite, β“˜ Aenigmatite, β“˜ Albite, β“˜ Alkali Feldspar, β“˜ Amphibole Supergroup, β“˜ Andalusite, β“˜ Arfvedsonite, β“˜ Astrophyllite, β“˜ BastnΓ€site, β“˜ Biotite, β“˜ Chevkinite Group, β“˜ Corundum, β“˜ Fayalite, β“˜ Feldspar Group, β“˜ Ferro-richterite, β“˜ Ferrosalite, β“˜ Fluocerite, β“˜ Fluorite, β“˜ Gneiss, β“˜ Granite, β“˜ Hedenbergite, β“˜ Katophorite, β“˜ Magnetite, β“˜ Mica Group, β“˜ Monazite Group, β“˜ Oligoclase, β“˜ Pegmatite, β“˜ Perthite, β“˜ Pyroxene Group, β“˜ Quartz-syenite, β“˜ Rhyolite, β“˜ Riebeckite, β“˜ Sillimanite, β“˜ Syenite, β“˜ Titanium-bearing Magnetite, β“˜ Yttrofluorite
Zomba-Malosa Complex, Southern Region, Malawiβ“˜ Aegirine, β“˜ Aegirine-augite, β“˜ Aenigmatite, β“˜ Alkali Feldspar, β“˜ Amphibole Supergroup, β“˜ Arfvedsonite, β“˜ Astrophyllite, β“˜ Biotite, β“˜ Charnockitic granite, β“˜ Chevkinite Group, β“˜ Diopside, β“˜ Feldspar Group, β“˜ Fluorite, β“˜ Gneiss, β“˜ Granite, β“˜ Granulite, β“˜ Hedenbergite, Hornblende, β“˜ Microgranite, β“˜ Perthite, β“˜ Pyrochlore Group, β“˜ Pyroxene Group, β“˜ Quartz, β“˜ Quartz-syenite, β“˜ Sodic amphibole, β“˜ Syenite, β“˜ Zircon

See Also

These are possibly similar items as determined by title/reference text matching only.

Woolley, Alan R., Platt, R. Garth (1988) The Peralkaline Nepheline Syenites of the Junguni Intrusion, Chilwa Province, Malawi. Mineralogical Magazine, 52 (367) 425-433 doi:10.1180/minmag.1988.052.367.01
Platt, R. Garth, Woolley, Alan R. (1986) The mafic mineralogy of the peralkaline syenites and granites of the Mulanje complex, Malawi. Mineralogical Magazine, 50 (355) 85-99 doi:10.1180/minmag.1986.050.355.12
Woolley, Alan R., Garth Platt, R. (1986) The mineralogy of nepheline syenite complexes from the northern part of the Chilwa Province, Malawi. Mineralogical Magazine, 50 (358) 597-610 doi:10.1180/minmag.1986.050.358.05
Eby, G. N., Woolley, A. R., Din, V., Platt, G. (1998) Geochemistry and Petrogenesis of Nepheline Syenites: Kasungu-Chipala, Ilomba, and Ulindi Nepheline Syenite Intrusions, North Nyasa Alkaline Province, Malawi. Journal of Petrology, 39 (8) 1405-1424 doi:10.1093/petroj/39.8.1405
Woolley, A. R., Platt, R. G., Eby, N. (1992) Niobian titanite and eudialyte from the Ilomba nepheline syenite complex, north Malawi. Mineralogical Magazine, 56 (384) 428-430 doi:10.1180/minmag.1992.056.384.19
Woolley, A.R., Platt, R.G. & Eby, G.N. 1996. Relatively aluminous alkali pyroxene in nepheline syenites from Malawi: mineralogical response to metamorphism in alkaline rocks. The Canadian Mineralogist, 34, 423-434.
Chakrabarty, A., Mitchell, R. H., Ren, M., Saha, P. K., Pal, S., Pruseth, K. L., Sen, A. K. (2016) Magmatic, hydrothermal and subsolidus evolution of the agpaitic nepheline syenites of the Sushina Hill Complex, India: implications for the metamorphism of peralkaline syenites. Mineralogical Magazine, 80 (7) 1161-1193 doi:10.1180/minmag.2016.080.057
Wall, F., Williams, C. T., Woolley, A. R., Nasraoui, M. (1996) Pyrochlore from Weathered Carbonatite at Lueshe, Zaire. Mineralogical Magazine, 60 (402) 731-750 doi:10.1180/minmag.1996.060.402.03
Jones, A. P. (1984) Mafic silicates from the nepheline syenites of the Motzfeldt centre, South Greenland. Mineralogical Magazine, 48 (346) 1-12 doi:10.1180/minmag.1984.048.346.01
Zakrzewski, M. A., Lustenhouwer, W. J., Nugteren, H. J., Williams, C. T. (1992) Rare-earth minerals yttrian zirconolite and allanite-(Ce) and associated minerals from Koberg mine, Bergslagen, Sweden. Mineralogical Magazine, 56 (382) 27-35 doi:10.1180/minmag.1992.056.382.03
Mitchell, R. H., Platt, R. G. (1982) Mineralogy and Petrology of Nepheline Syenites from the Coldwell Alkaline Complex, Ontario, Canada. Journal of Petrology, 23 (2) 186-214 doi:10.1093/petrology/23.2.186
 
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