Metallogenesis in the French part of the Variscan orogen. Part I: U preconcentrations in pre-Variscan and Variscan formations — a comparison with Sn, W and Au

Cuney, Michel; Friedrich, Marc; Blumenfeld, Philippe; Bourguignon, Anne; Boiron, M.C.; Vigneresse, Jean-Louis; Poty, B.

doi:10.1016/0040-1951(90)90273-b

Cited by 80 publications

(50 citation statements)

References 31 publications

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“…Uranium represents the most important resource in the region and has been mined within the three uraniferous districts of Pontivy, Mortagne and Guérande up until the end of the 90's (Cathelineau et al, 1990;Cuney et al, 1990) (Fig. 1).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Magmatic and hydrothermal behavior of uranium in syntectonic leucogranites: The uranium mineralization associated with the Hercynian Guérande granite (Armorican Massif, France)

Ballouard

Poujol

Boulvais

et al. 2017

Ore Geology Reviews

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT Abstract:Most of the hydrothermal uranium (U) deposits from the European Hercynian belt (EHB) are spatially associated with Carboniferous peraluminous leucogranites. In the southern part of the Armorican Massif (French part of the EHB), the Guérande peraluminous leucogranite was emplaced in an extensional deformation zone at ca. 310 Ma and is spatially associated with several U deposits and occurrences. The apical zone of the intrusion is structurally located below the Pen Ar Ran U deposit, a perigranitic vein-type deposit where mineralization occurs at the contact between black shales and Ordovician acid metavolcanics. In the Métairie-Neuve intragranitic deposit, uranium oxide-quartz veins crosscut the granite and a metasedimentary enclave. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Magmatic and hydrothermal behavior of uranium in syntectonic leucogranites: The uranium mineralization associated with the Hercynian Guérande granite (Armorican Massif, France)

Ballouard

Poujol

Boulvais

et al. 2017

Ore Geology Reviews

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“…Toutefois, le rapport U/Th élevé témoigne d'un faible lessivage dans les échantil-lons étudiés (Cuney et al 1989). Les études minéralogiques dans les plutons montrent que les remobilisations tardives de l'uranium se produisent après la métamictisation des niobotitanates.…”

Section: Contexte Géologiqueunclassified

Le magmatisme de la région de Kwyjibo, Province du Grenville (Canada) : intérêt pour les minéralisations de type fer-oxydes associées

Magrina¹,

Jébrak²,

Cuney³

2005

Can. J. Earth Sci.

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Résumé : Les plutons granitiques situés au nord de la propriété Kwyjibo sont d'âge mésoprotérozoïque et appartiennent au complexe granitique de Canatiche dans la province de Grenville au Québec. Les roches qui les constituent sont calco-alcalines fortement potassiques et méta-à peralumineuses. Elles appartiennent aux séries à magnétite, et leurs caractéristiques en éléments traces les rattachent aux granites intraplaques. Elles se sont mises en place dans un contexte subvolcanique et anorogénique, mais ont subi ensuite une déformation ductile très importante. Abstract :The granitic plutons located north of the Kwyjibo property in Quebec's Grenville Province are of Mesoproterozoic age and belong to the granitic Canatiche Complex . The rocks in these plutons are calc-alkalic, K-rich, and meta-to peraluminous. They belong to the magnetite series and their trace element characteristics link them to intraplate granites. They were emplaced in an anorogenic, subvolcanic environment, but they subsequently underwent significant ductile deformation. The magnetite, copper, and fluorite showings on the Kwyjibo property are polyphased and premetamorphic; their formation began with the emplacement of hydraulic, magnetite-bearing breccias, followed by impregnations and veins of chalcopyrite, pyrite, and fluorite, and ended with a late phase of mineralization, during which uraninite, rare earths, and hematite were emplaced along brittle structures. The plutons belong to two families: biotite-amphibole granites and leucogranites. The biotite-amphibole granites are rich in iron and represent a potential heat and metal source for the first, iron oxide phase of mineralization. The leucogranites show a primary enrichment in REE (rare-earth elements), F, and U, carried mainly in Y-, U-, and REE-bearing niobotitanates. They are metamict and underwent a postmagmatic alteration that remobilized the uranium and the rare earths. The leucogranites could also be a source of rare earths and uranium for the latest mineralizing events.

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“…Les travaux de Boyer et al (1975), Routhier (1976, Derré (1982), et Cuney et al (1990) , ou mettre en évidence un faciès particulier dont la signature agit comme révélateur de metallotectes.…”

Section: ) Source Et Spécialisation Des Métauxunclassified

Application des techniques geostatistiques et d analyse multivariable a l interpretation des releves geochimiques regionaux

Bellehumeur¹

1992

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Metallogenesis in the French part of the Variscan orogen. Part I: U preconcentrations in pre-Variscan and Variscan formations — a comparison with Sn, W and Au

Cited by 80 publications

References 31 publications

Magmatic and hydrothermal behavior of uranium in syntectonic leucogranites: The uranium mineralization associated with the Hercynian Guérande granite (Armorican Massif, France)

Magmatic and hydrothermal behavior of uranium in syntectonic leucogranites: The uranium mineralization associated with the Hercynian Guérande granite (Armorican Massif, France)

Le magmatisme de la région de Kwyjibo, Province du Grenville (Canada) : intérêt pour les minéralisations de type fer-oxydes associées

Application des techniques geostatistiques et d analyse multivariable a l interpretation des releves geochimiques regionaux

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