Article : Stability relationships of REE-bearing phosphates in an alkali-rich system (nepheline syenite from the Mariupol Massif, SE Ukraine)
Authors : Hu, X.Department of Ocean Science and Engineering, Zhejiang University, Hangzhou 310058, China, Jeans, C.Department of Geography, University of Cambridge, Downing Street, Cambridge CB2 3EN, UK, Zapalski, M.Faculty of Geology, Warsaw University, ul. Żwirki i Wigury 93, PL-02-089 Warsaw, Poland, email@example.com, Demircan, H.Department of Geological Research, General Directorate of Mineral Research and Exploration (MTA), 06520, Ankara, Turkey, firstname.lastname@example.org, Radwański, A.Faculty of Geology, University of Warsaw, Al. Żwirki i Wigury 93; PL-02-089 Warszawa, Poland, email@example.com, Meres, S.Department of Geochemistry, Faculty of Natural Sciences, Comenius University, Mlynska dolina – G, 842 15 Bratislava, Slovakia, firstname.lastname@example.org, Dumańska-Słowik, 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, email@example.com,
Abstract : 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.
Publishing house : Faculty of Geology of the University of Warsaw
Publication date : 2012
Number : Vol. 62, no. 2
Page : 247 – 265
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Qute : Hu, X. ,Jeans, C. ,Zapalski, M. ,Demircan, H. ,Radwański, A. ,Meres, S. ,Dumańska-Słowik, M. ,Dumańska-Słowik, M. , Stability relationships of REE-bearing phosphates in an alkali-rich system (nepheline syenite from the Mariupol Massif, SE Ukraine). Acta Geologica Polonica Vol. 62, no. 2/2012