MONAZITE-(Sm), A NEW MEMBER OF THE MONAZITE GROUP FROM THE ANNIE CLAIM #3 GRANITIC PEGMATITE, SOUTHEASTERN MANITOBA

Masau, Morgan; Černý, Petr; Cooper, Mark A.; Chapman, Ron; Grice, Joel D.

doi:10.2113/gscanmin.40.6.1649

Cited by 28 publications

(23 citation statements)

References 16 publications

(11 reference statements)

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“…Monazite solid-solution, in which Sm is the predominant REE, is very rare and monazite-(Sm) has been described as a new species only recently (Masau et al, 2002). In the vast majority of cases, the lighter REE (Ce in particular) are predominant and a Nd/Sm ratio of approximately 10 appears to be common (Zhu and O'Nions, 1999).…”

Section: Application To Natural Systemsmentioning

confidence: 99%

A spectrophotometric study of samarium (III) speciation in chloride solutions at elevated temperatures

Migdisov

Williams‐Jones

Normand

et al. 2008

Geochimica et Cosmochimica Acta

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Section: Application To Natural Systemsmentioning

confidence: 99%

A spectrophotometric study of samarium (III) speciation in chloride solutions at elevated temperatures

Migdisov

Williams‐Jones

Normand

et al. 2008

Geochimica et Cosmochimica Acta

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“…Coloured lines indicate the field boundaries for dominant Sm (red and blue) and Yb (all others). Data sources: Masau et al (2002), Repina et al (2011), Voloshin et al (1984), Voloshin et al (1983), Simmons et al (2006) and Buck et al (1999). …”

Section: Resultsmentioning

confidence: 99%

Rare earth mineral diversity controlled by REE pattern shapes

Anenburg

2020

MinMag

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The line connecting rare earth elements (REE) in chondrite-normalised plots can be represented by a smooth polynomial function using λ shape coefficients as described by O'Neill (2016). In this study, computationally generated λ combinations are used to construct artificial chondrite-normalised REE patterns that encompass most REE patterns likely to occur in natural materials. The dominant REE per pattern is identified, which would lead to its inclusion in a hypothetical mineral suffix, had this mineral contained essential REE. Furthermore, negative Ce and Y anomalies, common in natural minerals, are considered in the modelled REE patterns to investigate the effect of their exclusion on the relative abundance of the remainder REE. The dominant REE in a mineral results from distinct pattern shapes requiring specific fractionation processes, thus providing information on its genesis. Minerals dominated by heavy lanthanides are rare or non-existent, even though the present analysis shows that REE patterns dominated by Gd, Dy, Er and Yb are geologically plausible. This discrepancy is caused by the inclusion of Y, which dominates heavy REE budgets, in mineral name suffixes. The focus on Y obscures heavy lanthanide mineral diversity and can lead to various fractionation processes to be overlooked. Samarium dominant minerals are known, even though deemed unlikely by the computational model, suggesting additional fractionation processes that are not well described by λ shape coefficients. Positive Eu anomalies only need to be moderate in minerals depleted in the light REE for Eu to be the dominant REE, thus identifying candidate rocks in which the first Eu dominant mineral might be found. Here, I present an online tool, called ALambdaR that allows interactive control of λ shape coefficients and visualisation of resulting REE patterns.

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“…Table 3: a, long columnar zircon crystal from kaolinized biotite granite (the older intrusive complex of the Nejdek pluton, NEP1), borehole GS7/248 near Sokolov; b, patchy zoned zircon enclosed in chlorite from biotite granite (the older intrusive complex of the Nejdek pluton, NEP1), borehole KP 59/06 near Královské Poříčí; c, oscillatory zoned zircon from the coarsegrained Li-biotite-topaz granite (the younger intrusive complex of the Nejdek pluton, NEP2), near Horní Blatná; d, zoned zircon crystal enclosed in biotite from porphyritic fine-grained biotite granite (the younger intrusive complex of the Nejdek pluton, NEP2), Karlovy VaryTuhnice; e, several small zircon crystals associated with apatite, ilmenite and monazite embedded in biotite and muscovite, fine-grained biotitemuscovite Lipnice-type granite (MP1), Lipnice; f, small zircon crystals associated with large apatite, ilmenite and monazite enclosed in biotite, medium-grained biotite-muscovite Kouty-type granite (MP2), Kouty; g, zoned zircon crystal enclosed in altered plagioclase from coarse-grained two-mica Melechov-type granite (MP2), Melechov hill; h, association of monazite, zircon, apatite and ilmenite in the porphyritic biotite Steinbergtype granite (PPP1), Pendelin, Austria; i, association of zircon and monazite crystals with apatite, coarse-grained two-mica Plechý-type granite (PPP2), Trojmezná hill; j, monazite (white) and several zoned zircon crystal (gray) enclosed in biotite, porphyritic fine-grained biotite granite (the younger intrusive complex of the Nejdek pluton, NEP2), Karlovy Vary-Tuhnice; k, cheralite (white) and two fragments of zoned zircon enclosed in kaolinite, kaolinized biotite granite (the older intrusive complex of the Nejdek pluton, NEP1), borehole GS7/248 near Sokolov; l, altered and partly altered monazite grain (white) associated with fragments of zoned zircon (gray) and rounded aggregate of organogenic pyrite, kaolinitized biotite granite (the older intrusive complex of the Nejdek pluton, NEP1), borehole GS7/248 near Sokolov lowest (approximately 0.7) were in the PPP1 granites. Monazite varieties with prevailing La (monazite-(La)) or another REE are rare (Graeser and Schwander 1987;Masau et al 2002) and were not identified in the studied set of rocks. It is worth noting that the overall correlation between La and Ce is positive (Fig.…”

Section: Monazite-(ce)mentioning

confidence: 99%

Monazite and zircon as major carriers of Th, U, and Y in peraluminous granites: examples from the Bohemian Massif

Breiter

2016

Miner Petrol

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The chemical compositions of zircon and monazite and the relationships between the contents of Th, U, Y, and REE in both minerals and in the bulk samples of their parental rocks were studied in three Variscan composite peraluminous granite plutons in the Bohemian Massif. It was established that granites of similar bulk composition contain zircon and monazite of significantly different chemistry. Monazite typically contains 5-13 wt% (rarely up to 28 wt%) ThO 2 , 0.4-2 wt% (up to 8.2 wt%) UO 2 , and 0.5-2 wt% (up to 5 wt%) Y 2 O 3 , whereas zircon typically contains less than 0.1 wt% (rarely up to 1.7 wt%) ThO 2 , less than 1 wt% UO 2 (in the Plechý/Plockenstein granite, commonly, 1-2 wt% and scarcely up to 4.8 wt% UO 2 ), and less than 1 wt% Y 2 O 3 (in the Nejdek pluton often 2-5, maximally 7 wt% Y 2 O 3 ). Monazite is an essential carrier of thorium, hosting more than 80 % of Th in all studied granites. Monazite also appears to be an important carrier of Y (typically 14-16 %, and in the Melechov pluton, up to 81 % of the total rock content) and U (typically 18-35 % and occasionally 6-60 % of the total rock budget). The importance of zircon for the rock budget of all the investigated elements in granites is lower: 4-26 % U, 5-17 % Y, and less than 5 % Th.

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MONAZITE-(Sm), A NEW MEMBER OF THE MONAZITE GROUP FROM THE ANNIE CLAIM #3 GRANITIC PEGMATITE, SOUTHEASTERN MANITOBA

Cited by 28 publications

References 16 publications

A spectrophotometric study of samarium (III) speciation in chloride solutions at elevated temperatures

A spectrophotometric study of samarium (III) speciation in chloride solutions at elevated temperatures

Rare earth mineral diversity controlled by REE pattern shapes

Monazite and zircon as major carriers of Th, U, and Y in peraluminous granites: examples from the Bohemian Massif

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