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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

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Reference TypeJournal (article/letter/editorial)
TitleMafic silicates from the nepheline syenites of the Motzfeldt centre, South Greenland
JournalMineralogical MagazineISSN0026-461X
AuthorsJones, A. P.Author
Year1984 (March)Volume48
Issue346
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_48/48-346-1.pdf+
DOIdoi:10.1180/minmag.1984.048.346.01Search in ResearchGate
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Mindat Ref. ID3581Long-form Identifiermindat:1:5:3581:5
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Full ReferenceJones, 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
Plain TextJones, 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
In(1984, March) Mineralogical Magazine Vol. 48 (346) Mineralogical Society
Abstract/NotesAbstractAt least five successive intrusions of nepheline-bearing magmas fractionated in situ and developed repeatedly overlapping, yet distinct chemical trends in the mafic silicates. Representative electron probe analyses are given for olivine, clinopyroxene, amphibole, biotite, and aenigmatite and their variations discussed. Increasing Na with fractionation produced aegirine-rich clinopyroxene and caused Na/K in amphibole to increase from 2.4 to 7.0. Siz/Alz increased in both amphibole and in the less abundant mica. Mn-enrichment is common to all of the mafic silicates, including the olivines and it is suggested that the parent magmas were initially Mn-rich.Mineralogically the Motzfeldt centre is evolved and similar to the other centres in the Igaliko complex. However, the Motzfeldt centre contains the most fractionated rocks (lujavrites) and is in this respect similar to the peralkaline Ilimaussaq intrusion. The compositional ranges and trends of the mafic silicates in Motzfeldt thus provide links between the uncommon peralkaline plutons and the more abundant and typical nepheline syenites.

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Coulson, I. M. (2003) Evolution of the North Qôroq centre nepheline syenites, South Greenland: alkali-mafic silicates and the role of metasomatism. Mineralogical Magazine, 67 (5) 873-892 doi:10.1180/0026461036750149
Coulson, I. M. (2003). Evolution of the North Qôroq centre nepheline syenites, South Greenland: alkali-mafic silicates and the role of metasomatism. Mineralogical Magazine, 67(5), 873-892.
Jones, A. P., Larsen, L. M. (1985) Geochemistry and REE minerals of nepheline syenites from the Motzfeldt Centre, South Greenland. American Mineralogist, 70 (11-12) 1087-1100
Finch, Adrian A. (1990) Genthelvite and willemite, zinc minerals associated with alkaline magmatism from the Motzfeldt centre, South Greenland. Mineralogical Magazine, 54 (376) 407-412 doi:10.1180/minmag.1990.054.376.05
Stolz, A. J. (1984) Garnet websterites and associated ultramafic inclusions from a nepheline mugearite in the Walcha area, New South Wales, Australia. Mineralogical Magazine, 48 (347) 167-179 doi:10.1180/minmag.1984.048.347.02
Scatena-Wachel, D. E.; Jones, A. P. (1984) Primary baddeleyite (ZrO2) in kimberlite from Benfontein, South Africa. Mineralogical Magazine, 48 (347). 257-261 doi:10.1180/minmag.1984.048.347.10
Birch, W. D. (1984) Roepperite from Broken Hill (New South Wales) is ferroan tephroite. Mineralogical Magazine, 48 (346) 137-139 doi:10.1180/minmag.1984.048.346.19
Nickel, E. H. (1984) An unusual pyrite-sulphur-jarosite assemblage from Arkaroola, South Australia. Mineralogical Magazine, 48 (346) 139-142 doi:10.1180/minmag.1984.048.346.20
Coulson, Ian M. (1997) Post-magmatic alteration in eudialyte from the North Qôroq centre, South Greenland. Mineralogical Magazine, 61 (404) 99-109 doi:10.1180/minmag.1997.061.404.10
Hodson, Mark (1997) Post-crystallisation modification of the igneous layering in the Nunarssuit and West Kûngnât syenites, South Greenland. Mineralogical Magazine, 61 (407) 467-483 doi:10.1180/minmag.1997.061.407.01
Wearing, E. (1984) Platy phlogopite from blast-furnace slags. Mineralogical Magazine, 48 (346) 81-84 doi:10.1180/minmag.1984.048.346.10
 
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