Uranium-enriched minerals in mesostasis areas of the Rhum layered pluton

Williams, C. T.

doi:10.1007/bf00376083

Cited by 31 publications

(28 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Owing to the lack of X-ray diffraction data, we have retained the name zirconolite for the oxide mineral containing Ca-Zr-Ti as major oxides roughly totalling four cations for seven oxygens per formula unit (Table 1). This is in agreement with the nomenclature widely accepted in previous papers devoted to zirconolite (Frondel, 1975;Williams, 1978).…”

Section: Zirconolitesupporting

confidence: 91%

“…To date, the nomenclature and formula of zirconolite are still matters of discussion (Williams, 1978). Two formulae (and names) have been proposed, namely zirconolite--AB30 7 and zirkelite--AB205.…”

Section: Zirconolitementioning

confidence: 99%

“…Baddeleyite has been described in the Axel Heilberg gabbro, Arctic Canada (Keil and Fricker, 1974), and in a Norwegian anorthosite (Gierth and Kraus, 1974). To our knowledge, the only layered basic intrusion that contains both zirconolite and baddeleyite is that of Rhum, Inverness-shire, Scotland (Williams, 1978).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new natural occurrence of zirconolite (CaZrTi₂O₇) and baddeleyite (ZrO₂) in basic cumulates: the Laouni layered intrusion (Southern Hoggar, Algeria)

Lorand

Cottin

1987

Mineral. mag.

View full text Add to dashboard Cite

Four grains of zirconolite and baddeleyite have been found in two plagioclase-rich adcumulates from the Laouni layered intrusion (Southern Hoggar, Algeria). Zirconolite is poor in REE; baddeleyite is chemically close to ZrO 2 and contains minor amounts of Hf. They are considered to be crystallization products of pockets of intercumulus liquid. The preferential distribution of zirconolite in anorthosite is explained in terms of expulsion of the intercumulus liquid by sintering or annealing of plagioclase. The crystallization of baddeleyite reflects the sharp increase of Zr in the trapped intercumulus liquid.

show abstract

Section: Zirconolitesupporting

confidence: 91%

Section: Zirconolitementioning

confidence: 99%

See 1 more Smart Citation

A new natural occurrence of zirconolite (CaZrTi₂O₇) and baddeleyite (ZrO₂) in basic cumulates: the Laouni layered intrusion (Southern Hoggar, Algeria)

Lorand

Cottin

1987

Mineral. mag.

View full text Add to dashboard Cite

show abstract

“…Inclusions of zirconolite in phlogopite which has been partially replaced by chlorite show that formation of zirconolite preceeded the final stage of spinel alteration. Baddeleyite, commonly associated with zirconolite (Hussak and Prior 1897;Busche et al 1972;Meyer and Boctor 1974;Zhuravleva et al 1976;Williams 1978;Purtscheller and Tessadri 1985), was not found in the Bergell sample. Sphene is the most important REE-bearing mineral.…”

Section: Matrixmentioning

confidence: 85%

“…Zirconolite is a rare mineral on earth. It occurs in mesostasis areas of ultrabasic cumulates (Williams 1978), in gabbroic pegmatites (Harding et al 1982), in sanidinites (Mazzi and Munno 1983) and in carbonatites (Kapustin 1966;Zhuravleva et al 1976;Sinclair and Eggleton 1982). The mineral is also known from altered pyroxenites (Hussak and Prior 1897, Borodin et al 1956, 1961.…”

Section: Introductionmentioning

confidence: 99%

Zirconolite, allanite and hoegbomite in a marble skarn from the Bergell contact aureole: implications for mobility of Ti, Zr and REE

Gieré¹

1986

Contr. Mineral. and Petrol.

107

View full text Add to dashboard Cite

Abstract. Zirconolite, allanite and hoegbomite are present as accessory phases in a metasomatically altered spinel-calcite-marble from the contact with the Bergell intrusives (Switzerland/Italy). Textural relationships indicate a stepwise alteration of spinel to 1) hoegbomite or corundum + magnetite, 2) margarite and 3) chlorite. Replacement of spinel by hoegbomite can be described by the substitution 1.94(M g2 + F e2 + z n 2 + m n 2+ ca2+),,T•4+ + 0.12(OH ) where Al' and Fe' are held constant. The average composition of the Bergell hoegbomites is given by the formula Fe u 7 Mg0.69 Zn 0.04 Ti 0.17 A1 3.94 F4.+060 7.98( OH )0.02 and seems to be imposed by the composition of pre-existing spinel. During the first two steps of spinel alteration, calcite was replaced by anorthite + phlogopite, and the rare earth element(REE)-bearing minerals zirconolite, allanite and sphene were formed. Allanites have characteristic chondrite-normalized REE patterns with enrichment in the light REE. The zirconolite patterns show a marked increase in concentration from La to Ce, followed by an almost constant section. Sphene lacks detectable La, and its REE patterns vary from grain to grain. Contemporaneous formation of phlogopite, REE-bearing minerals and hoegbomite during replacement of the spinel-calcite-marble indicates that the metamorphic fluid introduced potassium along with REE and other high valence cations (Ti', Zr4+ , U4+, Th', Nb', Y 3+ ) possibly as polynuclear complexes. The abundance of fluorine-bearing phlogopite and fluor-apatite as well as their close association with REE-bearing minerals and hoegbomite suggests F -and P01 -as likely ligands for complexing of the above mentioned elements.

show abstract

Thorium Minerals

Ditz¹,

Sarbas²,

Schubert³

et al. 1990

Th Thorium

View full text Add to dashboard Cite

Uranium-enriched minerals in mesostasis areas of the Rhum layered pluton

Cited by 31 publications

References 19 publications

A new natural occurrence of zirconolite (CaZrTi₂O₇) and baddeleyite (ZrO₂) in basic cumulates: the Laouni layered intrusion (Southern Hoggar, Algeria)

A new natural occurrence of zirconolite (CaZrTi₂O₇) and baddeleyite (ZrO₂) in basic cumulates: the Laouni layered intrusion (Southern Hoggar, Algeria)

Zirconolite, allanite and hoegbomite in a marble skarn from the Bergell contact aureole: implications for mobility of Ti, Zr and REE

Thorium Minerals

Contact Info

Product

Resources

About

Uranium-enriched minerals in mesostasis areas of the Rhum layered pluton

Cited by 31 publications

References 19 publications

A new natural occurrence of zirconolite (CaZrTi2O7) and baddeleyite (ZrO2) in basic cumulates: the Laouni layered intrusion (Southern Hoggar, Algeria)

A new natural occurrence of zirconolite (CaZrTi2O7) and baddeleyite (ZrO2) in basic cumulates: the Laouni layered intrusion (Southern Hoggar, Algeria)

Zirconolite, allanite and hoegbomite in a marble skarn from the Bergell contact aureole: implications for mobility of Ti, Zr and REE

Thorium Minerals

Contact Info

Product

Resources

About

A new natural occurrence of zirconolite (CaZrTi₂O₇) and baddeleyite (ZrO₂) in basic cumulates: the Laouni layered intrusion (Southern Hoggar, Algeria)

A new natural occurrence of zirconolite (CaZrTi₂O₇) and baddeleyite (ZrO₂) in basic cumulates: the Laouni layered intrusion (Southern Hoggar, Algeria)