Francoisite-(Ce), a new mineral species from La Creusaz uranium deposit (Valais, Switzerland) and from Radium Ridge (Flinders Ranges, South Australia): Description and genesis
Details
Serval ID
serval:BIB_1C4E59288A38
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Francoisite-(Ce), a new mineral species from La Creusaz uranium deposit (Valais, Switzerland) and from Radium Ridge (Flinders Ranges, South Australia): Description and genesis
Journal
American Mineralogist
ISSN-L
0003-004X
Publication state
Published
Issued date
2010
Peer-reviewed
Oui
Volume
95
Pages
1527-1532
Language
english
Abstract
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.
Create date
01/10/2012 20:07
Last modification date
20/08/2019 13:52