Monazite as an indicator of formation conditions of quartz veins at the Zhelannoe deposit, the Subpolar Urals

Repina, S. A.

doi:10.1134/s107570150807012x

Cited by 4 publications

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“…Therefore, the study of this unique man-made deposit goes beyond local interest. [11][12] are the most detailed studies in this area. They present chemical and mineralogical compositions for 34 monazite batches.…”

Section: Description Of the Raw Materialsmentioning

confidence: 99%

The Study of Rare Earth Production Based on Processing of Phosphorus-Containing Concentrates

Bujnovskij

Sachkov

Molokov

et al. 2016

KEM

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Due to their unique properties, rare-earth elements (REEs) are used in many areas of advanced high-tech industries. One of the most important sources of REEs is phosphorus-containing ores and concentrates, in particular monazite and apatite concentrates. Although a number of monazite processing methods are commercially used, they have some limitations. That is why the extensive research efforts are underway to develop new methods for recovery of REEs from monazite. This paper presents the research results for nitric-acid pressure decomposition of phosphorus-containing concentrate from the unique man-made deposit and demonstrates that this method is feasible in principle.

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Section: Description Of the Raw Materialsmentioning

confidence: 99%

The Study of Rare Earth Production Based on Processing of Phosphorus-Containing Concentrates

Bujnovskij

Sachkov

Molokov

et al. 2016

KEM

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“…The data on zoning and sectoriality of particular grains appeared only in recent years (Cressey et al, 1999;Townsend et al, 2000;Popova et al, 2007;Repina, 2007;Rasmussen et al, 2007). A striking case of sec torial monazite from Kangankunde carbonatite (Cres sey et al, 1999) will be considered below.…”

Section: Introductionmentioning

confidence: 95%

Zoning and sectoriality of monazite-(Ce) from granite pegmatites of the central and South Urals

Попова

Churin

2010

Geol. Ore Deposits

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Zonal and sectorial monazite (Ce) crystals from ceramic granite pegmatites of the Adui pluton are enriched in Ce and La, whereas monazite from the miarolitic gemstone pegmatites at the western contact of the pluton are enriched in Nd, Sm, Gd, and Y. This difference is caused by earlier crystallization of ceramic pegmatites and higher temperatures of their formation (650-600°C for ceramic pegmatites and 550-300°C for miarolitic pegmatites). Monazites from ceramic and miarolitic pegmatites of the Adui pluton differ in La and Nd contents, but their compositional trend in La-Nd coordinates is similar to the variation in monazite composition from the early to late granite pegmatites in the Ilmeny Mountains. It is suggested that decrease in temperature is a factor controlling REE contents in monazite. Heterovalent P Si and REE Th, Ca isomorphism in the consecutive zones of growth pyramids in monazite is both unidirectional and wave like. Monazite from granite pegmatites of the Adui pluton and Ilmeny Mountains crystallized mainly under slightly alkaline conditions.

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“…Entretanto, tais análises individualmente encontram-se espalhadas ao longo da linha de concórdia. As idades de Marciano 1995);7 -Pegmatito Mar de Espanha (Kato 1958, in Murata et al 1958; 8,9 -Granitos Urucum e Palmital (Nalini Jr. et al 1996, Nalini Jr. 1997; 10 -Greisen do depósito Bom Futuro -Rondônia (Souza et al 2005); 11 -Ortognaisse Jamari -Rondônia (Souza et al 2006);12,13,14/15 -Veios hidrotermais em Alinci, ex-Iugoslávia (Bermanec et al 1988); Liguria Central, Itália (Cabella et al 2001); e Montes Urais, Rússia,representando (14/15) respectivamente sistemas não alterados e alterados em hidrotermalismo pós-tumo (Repina 2008 Diamantina (Fig. 4-A), e entre 465 e 425 Ma com média ponderada de 444 ±4 Ma nas amostras de Olhos d'Água (Fig.…”

Section: Depósitos Estudadosunclassified

“…A presença de monazita em ambientes hidrotermais tem sido destacada em diversos estudos (eg. Bermanec et al 1988, Chang et al 1998, Cabella et al 2001, Spear & Pyle 2002, Repina 2008, enquanto revisões detalhadas recentes envolvendo datações geocronológicas a partir do mineral são encontradas em Catlos et al (2002), Harrison et al (2002) e Vlach (2010, entre outros. SÍNTESE GEOLÓGICA REGIONAL Todas as ocorrências estudadas se relacionam à Serra do Espinhaço em sua porção meridional (Fig.…”

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Monazita em veios de quartzo da Serra do Espinhaço Meridional (MG): mineralogia, idades LA-ICP-MS e implicações geológicas

Chaves

Brandão

Bühn

2010

RBG

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Resumo Com a descoberta de ocorrências de monazita num ambiente geológico incomum, em veios de quartzo na Serra do Espinhaço Meridional, propôs-se estudar a geologia desses depósitos e seus comportamentos químicos em três localidades (Buenópolis, Olhos d'Água e Diamantina), bem como datações geocronoló-gicas U-Pb por abrasão a laser MC-ICP-MS foram efetuadas em amostras de Diamantina e Olhos d'Água. Em Buenópolis, o mineral aparece como indivíduos geminados, em cascalheiras coluvionares na zona de contato do Grupo Macaúbas com o Supergrupo Espinhaço. Na ocorrência de Olhos d'Água, têm sido registrados grandes cristais em bolsões ovalados métricos, hospedados em metapelitos do Grupo Macaúbas. Em Diamantina, foram estudados cristais milimétricos de um depósito coluvionar do Rio Caeté-Mirim. Certamente, no primeiro e no terceiro casos, tais grãos se originaram dos abundantes veios de quartzo que seccionam as seqüências regionais. Análises com microssonda eletrônica mostraram valores de óxidos em geral semelhantes para os três depósitos, entretanto com certas particularidades. As amostras foram caracterizadas como monazitas-(Ce), localmente ricas em neodímio e, embora em geral não tenham revelado semelhanças absolutas para dois depó-sitos, Diamantina e Olhos d'Água apresentaram alguns aspectos químicos preferenciais. Os resultados U-Pb indicaram, supondo-se as idades mais antigas (~491 Ma) como de cristalização do mineral, uma extensão completa de idades na faixa entre 490 e 440 Ma, provavelmente devidas a reaquecimentos tardios. Em termos geotectônicos, tais idades permitem evidenciar as últimas manifestações referentes ao Ciclo Brasiliano na região.Palavras-chave: monazita-(Ce), Serra do Espinhaço, química mineral, geocronologia. Abstract Monazite in quartz-veins from the Southern Espinhaço Range (MG): mineralogy, LA-ICP-MS ages and geological implications.Due to the discovery of monazite occurrences in an uncommon geologic setting, in quartz veins cutting rocks of the Southern Espinhaço Range, a study was carried out on the geology and mineral chemistry of these deposits in three localities (Buenópolis, Olhos d'Água and Diamantina), as well as to make U-Pb laser ablasion MC-ICP-MS geochronological determinations in the Diamantina and Olhos d'Água samples. In Buenópolis, monazite specimens are common as twin crystals, occurring in colluvial gravel deposits in a contact zone between the Espinhaço Supergroup with the Macaúbas Group. The Olhos d'Água occurrence is in metric oval-shaped pockets hosted in metapelitic rocks of the Macaúbas Group, where large crystals have been discovered. In Diamantina, millimeter-size crystals were studied as broken grains recovered in a colluvial deposit near the Caeté-Mirim river. Certainly in the first and in the third cases, such grains came from the abundant regional quartz veins. Electron microprobe analyses showed similar oxide values for the three deposits, but with some chemical specific aspects. The samples have been identified as monazites-(Ce), locally Nd-rich; the Diamanti...

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Monazite as an indicator of formation conditions of quartz veins at the Zhelannoe deposit, the Subpolar Urals

Cited by 4 publications

References 0 publications

The Study of Rare Earth Production Based on Processing of Phosphorus-Containing Concentrates

The Study of Rare Earth Production Based on Processing of Phosphorus-Containing Concentrates

Zoning and sectoriality of monazite-(Ce) from granite pegmatites of the central and South Urals

Monazita em veios de quartzo da Serra do Espinhaço Meridional (MG): mineralogia, idades LA-ICP-MS e implicações geológicas

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