| Reference Type | Journal (article/letter/editorial) |
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| Title | Sulfur-bearing monazite-(Ce) from the Eureka carbonatite, Namibia: oxidation state, substitution mechanism, and formation conditions |
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| Journal | Mineralogical Magazine |
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| Authors | Broom-Fendley, Sam | Author |
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| Smith, Martin P | Author |
| Andrade, Marcelo B | Author |
| Ray, Santanu | Author |
| Banks, David A | Author |
| Loye, Edward | Author |
| Atencio, Daniel | Author |
| Pickles, Jonathan R | Author |
| Wall, Frances | Author |
| Year | 2019 (December 11) | Volume | < 84 |
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| Page(s) | 35-48 | Issue | < 1 > |
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| Publisher | Mineralogical Society |
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| URL | |
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| DOI | doi:10.1180/mgm.2019.79Search in ResearchGate |
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| Original Entry | Sam Broom-Fendley, Martin P Smith, Marcelo B Andrade, Santanu Ray, David A Banks, Edward Loye, Daniel Atencio, Jonathan R Pickles, Frances Wall (2020): Sulfur-bearing monazite-(Ce) from the Eureka carbonatite, Namibia: oxidation state, substitution mechanism, and formation conditions. Mineralogical Magazine 84, 35-48. [open access; https://doi.org/10.1180/mgm.2019.79] |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16117612 | Long-form Identifier | mindat:1:5:16117612:9 |
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| GUID | 12a40db9-f2cf-402c-b018-bd807a954892 |
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| Full Reference | Broom-Fendley, Sam, Smith, Martin P, Andrade, Marcelo B, Ray, Santanu, Banks, David A, Loye, Edward, Atencio, Daniel, Pickles, Jonathan R, Wall, Frances (2019) Sulfur-bearing monazite-(Ce) from the Eureka carbonatite, Namibia: oxidation state, substitution mechanism, and formation conditions. Mineralogical Magazine, 84 (1) 35-48 doi:10.1180/mgm.2019.79 |
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| Plain Text | Broom-Fendley, Sam, Smith, Martin P, Andrade, Marcelo B, Ray, Santanu, Banks, David A, Loye, Edward, Atencio, Daniel, Pickles, Jonathan R, Wall, Frances (2019) Sulfur-bearing monazite-(Ce) from the Eureka carbonatite, Namibia: oxidation state, substitution mechanism, and formation conditions. Mineralogical Magazine, 84 (1) 35-48 doi:10.1180/mgm.2019.79 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | AbstractSulfur-bearing monazite-(Ce) occurs in silicified carbonatite at Eureka, Namibia, forming rims up to ~0.5 mm thick on earlier-formed monazite-(Ce) megacrysts. We present X-ray photoelectron spectroscopy data demonstrating that sulfur is accommodated predominantly in monazite-(Ce) as sulfate, via a clino-anhydrite-type coupled substitution mechanism. Minor sulfide and sulfite peaks in the X-ray photoelectron spectra, however, also indicate that more complex substitution mechanisms incorporating S2–and S4+are possible. Incorporation of S6+through clino-anhydrite-type substitution results in an excess ofM2+cations, which previous workers have suggested is accommodated by auxiliary substitution of OH–for O2–. However, Raman data show no indication of OH–, and instead we suggest charge imbalance is accommodated through F–substituting for O2–. The accommodation of S in the monazite-(Ce) results in considerable structural distortion that may account for relatively high contents of ions with radii beyond those normally found in monazite-(Ce), such as the heavy rare earth elements, Mo, Zr and V. In contrast to S-bearing monazite-(Ce) in other carbonatites, S-bearing monazite-(Ce) at Eureka formed via a dissolution–precipitation mechanism during prolonged weathering, with S derived from an aeolian source. While large S-bearing monazite-(Ce) grains are likely to be rare in the geological record, formation of secondary S-bearing monazite-(Ce) in these conditions may be a feasible mineral for dating palaeo-weathering horizons. |
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