Harris, N. B. W., Mohammed, A. E. R. O., Shaddad, M. Z. (1983) Geochemistry and petrogenesis of a nepheline syenite-carbonatite complex from the Sudan. Geological Magazine, 120 (2) 115-127 doi:10.1017/s0016756800025279
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Geochemistry and petrogenesis of a nepheline syenite-carbonatite complex from the Sudan | ||
| Journal | Geological Magazine | ||
| Authors | Harris, N. B. W. | Author | |
| Mohammed, A. E. R. O. | Author | ||
| Shaddad, M. Z. | Author | ||
| Year | 1983 (March) | Volume | 120 |
| Issue | 2 | ||
| Publisher | Cambridge University Press (CUP) | ||
| DOI | doi:10.1017/s0016756800025279Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 252197 | Long-form Identifier | mindat:1:5:252197:2 |
| GUID | 0 | ||
| Full Reference | Harris, N. B. W., Mohammed, A. E. R. O., Shaddad, M. Z. (1983) Geochemistry and petrogenesis of a nepheline syenite-carbonatite complex from the Sudan. Geological Magazine, 120 (2) 115-127 doi:10.1017/s0016756800025279 | ||
| Plain Text | Harris, N. B. W., Mohammed, A. E. R. O., Shaddad, M. Z. (1983) Geochemistry and petrogenesis of a nepheline syenite-carbonatite complex from the Sudan. Geological Magazine, 120 (2) 115-127 doi:10.1017/s0016756800025279 | ||
| In | (1983, March) Geological Magazine Vol. 120 (2) Cambridge University Press (CUP) | ||
| Abstract/Notes | SummaryJabal Dumbeir is a nepheline syenite-carbonatite complex of Cambrian age (550 ± 87 Ma). The earliest igneous event of the complex was the intrusion of a phlogopite-sodalite nepheline syenite (ditroite) which was derived from the partial melting of the upper mantle. K, CO2 and F-rich volatiles metasomatise both the ditroite and the gneissic country rock which results in an orthoclase-rich undersaturated syenite (orthoclasite). Carbonatitic breccias and sovite dykes were subsequently emplaced carrying high levels of F, REE, Y and Th with extremely high LREE/HREE ratios (CeN/YbN = 64 ± 8). Such carbonatiticmagmas may be derived by partial melting of an LREE-enriched upper mantle. Hydrothermal emplacement of fluorite-quartz veins represent the final phase of igneous activity and these carry high levels of REE, Y, Th and U. Their emplacement was strongly controlled by a system of NNE strike-slip faults which have been reactivated in recent times. | ||
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