Stability relationships of REE-bearing phosphates in an alkali-rich system (nepheline syenite from the Mariupol Massif, SE Ukraine)

• Autorzy: Dumańska-Słowik M. , Budzyń B. , Heflik W. , Sikorska M.
• Języki publikacji: EN

Abstrakty

EN

Primary REE-enriched fluorapatite and fluorbritholite-(Ce) in nepheline syenite from the Mariupol Massif (SE Ukraine), contain textural and chemical evidence of late- to post-magmatic metasomatic alteration. REE mobilization and replacement of the primary phases by fluid-mediated coupled dissolution-reprecipitation strongly depended on the distance between the altered minerals in the host rock. Fluorapatite and fluorbritholite-(Ce) forming individual pristine grains were partially replaced by the same phase with a new composition, resulting in the presence of patchy zoning in altered grains. the increased REE contents in altered fluorapatite rim domains are related to REE mobilization from the altered REE-depleted rim domains of the fluorbritholite-(Ce). The REEs were transported by a fluid with high F activity. The alteration of fluorapatite and fluorbritholite-(Ce) grains in contact resulted in the partial replacement of the primary phases by the same phase with a new composition, but also in the partial replacement of the fluorapatite by secondary monazite and fluorite. The REE mobilized from the fluorbritholite-(Ce) in the presence of a F-rich fluid in an alkali-rich system promoted formation of monazite as the new phosphate REE-host. The presence of secondary parisite in the altered domains of the fluorapatite and fluorbritholite-(Ce) indicates a CO2 component in the fluid during metasomatic alteration.

Słowa kluczowe

EN

dissolution-reprecipitation; fluorapatite; fluorbritholite; Mariupolite; monazite; rare earth elements (REE); Ukraine

PL

fluorowy apaty; mariupolit; monacyt; pierwiastki ziem rzadkich; ponowne wytrącanie; rozpuszczanie; Ukraina

• Wydawca: Faculty of Geology of the University of Warsaw ; Komitet Nauk Geologicznych PAN
• Czasopismo: Acta Geologica Polonica
• Rocznik: 2012
• Tom: Vol. 62, no. 2
• Strony: 247--265
• Opis fizyczny: Bibliogr. 58 poz., rys., tab.,

Twórcy

autor

Dumańska-Słowik M.

autor

Budzyń B.

autor

Heflik W.

autor

Sikorska M.

• AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection Department of Mineralogy, Petrography and Geochemistry, al. A. Mickiewicza 30, PL-30-059 Kraków, Poland,

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