Titre
Francoisite-(Ce), a new mineral species from La Creusaz uranium deposit (Valais, Switzerland) and from Radium Ridge (Flinders Ranges, South Australia): Description and genesis
Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
Auteur(s)
Meisser, N.
Auteure/Auteur
Brügger, J.
Auteure/Auteur
Ansermet, S.
Auteure/Auteur
Thélin, P.
Auteure/Auteur
Bussy, F.
Auteure/Auteur
Liens vers les personnes
Liens vers les unités
ISSN
0003-004X
Statut éditorial
Publié
Date de publication
2010
Volume
95
Première page
1527
Dernière page/numéro d’article
1532
Peer-reviewed
Oui
Langue
anglais
Résumé
The new mineral francoisite-(Ce),
(Ce,Nd,Ca)[(UO(2))(3)O(OH)(PO(4))(2)]center dot 6H(2)O is the
Ce-analog of francoisite-(Nd). It has been discovered simultaneously at
the La Creusaz uranium deposit near Les Marecottes in Valais,
Switzerland, and at the Number 2 uranium Workings, Radium Ridge near Mt.
Painter, Arkaroola area, Northern Flinders Ranges in South Australia.
Francoisite-(Ce) is a uranyl-bearing supergene mineral that results from
the alteration under oxidative conditions of REE- and U(4+)-bearing
hypogene minerals: allanite-(Ce), monazite-(Ce), +/- uraninite at Les
Marecottes; monazite-(Ce), ishikawaite-samarskite, and an unknown
primary U-mineral at Radium Ridge. The REE composition of
francoisite-(Ce) results from a short aqueous transport of REE leached
out of primary minerals [most likely monazite-(Ce) at Radium Ridge and
allanite-(Ce) at La Creusaz], with fractionation among REE resulting
mainly from aqueous transport, with only limited Ce loss due to
oxidation to Ce(4+) during transport.
(Ce,Nd,Ca)[(UO(2))(3)O(OH)(PO(4))(2)]center dot 6H(2)O is the
Ce-analog of francoisite-(Nd). It has been discovered simultaneously at
the La Creusaz uranium deposit near Les Marecottes in Valais,
Switzerland, and at the Number 2 uranium Workings, Radium Ridge near Mt.
Painter, Arkaroola area, Northern Flinders Ranges in South Australia.
Francoisite-(Ce) is a uranyl-bearing supergene mineral that results from
the alteration under oxidative conditions of REE- and U(4+)-bearing
hypogene minerals: allanite-(Ce), monazite-(Ce), +/- uraninite at Les
Marecottes; monazite-(Ce), ishikawaite-samarskite, and an unknown
primary U-mineral at Radium Ridge. The REE composition of
francoisite-(Ce) results from a short aqueous transport of REE leached
out of primary minerals [most likely monazite-(Ce) at Radium Ridge and
allanite-(Ce) at La Creusaz], with fractionation among REE resulting
mainly from aqueous transport, with only limited Ce loss due to
oxidation to Ce(4+) during transport.
PID Serval
serval:BIB_1C4E59288A38
Date de création
2012-10-01T18:07:42.894Z
Date de création dans IRIS
2025-05-20T13:47:41Z