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Monazite-(Ce) and xenotime-(Y) microinclusions in fluorapatite of the pegmatites from the Volta Grande mine, Minas Gerais state, southeast Brazil, as witnesses of the dissolution–reprecipitation process

Published online by Cambridge University Press:  25 June 2019

Felipe Emerson André Alves
Affiliation:
Programa de Pós-Graduação em Geologia, Instituto de Geociências, Universidade Federal do Rio de Janeiro, Cidade Universitária, 21949-900, Ilha do Fundão, Rio de Janeiro, RJ, Brazil Centre for Mineral Technology, Division for Technological Characterisation, Avenida Pedro Calmon, 900, 22941-908, Ilha do Fundão, Rio de Janeiro, RJ, Brazil
Reiner Neumann
Affiliation:
Centre for Mineral Technology, Division for Technological Characterisation, Avenida Pedro Calmon, 900, 22941-908, Ilha do Fundão, Rio de Janeiro, RJ, Brazil Programa de Pós-Graduação em Geociências, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista s/n, 20940-040, São Cristóvão, Rio de Janeiro, RJ, Brazil
Ciro Alexandre Ávila
Affiliation:
Programa de Pós-Graduação em Geologia, Instituto de Geociências, Universidade Federal do Rio de Janeiro, Cidade Universitária, 21949-900, Ilha do Fundão, Rio de Janeiro, RJ, Brazil Programa de Pós-Graduação em Geociências, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista s/n, 20940-040, São Cristóvão, Rio de Janeiro, RJ, Brazil
Fabiano Richard Leite Faulstich
Affiliation:
Programa de Pós-Graduação em Geociências, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista s/n, 20940-040, São Cristóvão, Rio de Janeiro, RJ, Brazil
Corresponding

Abstract

Fluorapatite with monazite-(Ce) and xenotime-(Y) microinclusions occurs in the lithium–caesium–tantalum pegmatite body A of the Volta Grande mine, Minas Gerais state, Southeast Brazil. The fluorapatite displays faint zoning, detected mainly by cathodoluminescence. Electron probe and laser ablation analyses indicate that zoning in the fluorapatite corresponds to variation in Mn and rare-earth element (REE) content. Such compositional variation is attributed to partial removal of the REE from the fluorapatite structure during a dissolution–reprecipitation process, forming monazite-(Ce) and xenotime-(Y) microinclusions in the REE-depleted zones of the fluorapatite. These inclusions exhibit an inherited geochemical signature, manifested by low Th and U concentrations when compared to monazite and xenotime crystallised from melts. Rhodochrosite and calcite inclusions are also associated with monazite-(Ce) and xenotime-(Y) and are probably products of the same process, recycling Ca, Mn, and CO32− from the fluorapatite through the following reaction: [Ca(5–2ab–½x),Naa,(Y + REE)a,Mnb][(PO4)3–x(CO3)x(F)] + Fluid[a(2Ca2+ + P5+) + (xb)(Ca2+) + H2O)] → [Ca5(PO4)3(F,OH)] + a[(Y + REE)PO4] + b[Mn(CO3)] + (xb)[Ca(CO3)] + Fluid a[Na+].

On the basis of new fluid-inclusion analyses, we propose that a hot (T > 204.5°C), salty (16 wt.% eq. NaCl, attributed to LiCl), hydrous fluid mediated the dissolution–reprecipitation of the fluorapatite. This fluid corresponds to similarly described Li-rich fluids which were suggested to have re-equilibrated the mineralogical assemblage at the Volta Grande mine.

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Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: Ian Coulson

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Monazite-(Ce) and xenotime-(Y) microinclusions in fluorapatite of the pegmatites from the Volta Grande mine, Minas Gerais state, southeast Brazil, as witnesses of the dissolution–reprecipitation process
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Monazite-(Ce) and xenotime-(Y) microinclusions in fluorapatite of the pegmatites from the Volta Grande mine, Minas Gerais state, southeast Brazil, as witnesses of the dissolution–reprecipitation process
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Monazite-(Ce) and xenotime-(Y) microinclusions in fluorapatite of the pegmatites from the Volta Grande mine, Minas Gerais state, southeast Brazil, as witnesses of the dissolution–reprecipitation process
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