| Reference Type | Journal (article/letter/editorial) |
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| Title | Upper-mantle metasomatism beneath a continental rift: clinopyroxenes in alkali mafic lavas and nodules from Sruth West Uganda |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Lloyd, F. E. | Author |
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| Year | 1981 (September) | Volume | 44 |
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| Issue | 335 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_44/44-335-315.pdf+ |
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| DOI | doi:10.1180/minmag.1981.044.335.12Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3277 | Long-form Identifier | mindat:1:5:3277:7 |
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| GUID | 0 |
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| Full Reference | Lloyd, F. E. (1981) Upper-mantle metasomatism beneath a continental rift: clinopyroxenes in alkali mafic lavas and nodules from Sruth West Uganda. Mineralogical Magazine, 44 (335) 315-323 doi:10.1180/minmag.1981.044.335.12 |
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| Plain Text | Lloyd, F. E. (1981) Upper-mantle metasomatism beneath a continental rift: clinopyroxenes in alkali mafic lavas and nodules from Sruth West Uganda. Mineralogical Magazine, 44 (335) 315-323 doi:10.1180/minmag.1981.044.335.12 |
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| In | (1981, September) Mineralogical Magazine Vol. 44 (335) Mineralogical Society |
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| Abstract/Notes | AbstractClinopyroxenes are dominant in highly potassic, silica undersaturated mafic volcanics occurring on the western rim of the uplifted, rifted East African craton. A kimbcrlite style of eruption provides nodules of alkali clinopyroxenite (clinopyroxene + titaniferous phlogopite+titanomagnetite, apatite, sphene, and rare corroded olivine) which have similar bulk chemistry to the feldspathoid-bearing lavas. Many nodules display metasomatic textures supporting a formation from the alteration of pre-existing material; clinopyroxene growth is characterized by complex, non-oscillatory colour zoning. Comparison of natural clinopyroxene chemistry with published data for elinopyroxenes crystallized from synthetic potassium-rich mafic material, suggests that a significant proportion of the nodules crystallized at upper-mantle pressures. Neither garnet- nor orthopyroxene-bearing nodules have ever been recorded from south-west Uganda, suggesting that metasomatism of the local mantle has proceeded far enough to obliterate all recognizable remnants of four-phase lherzolite. |
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