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Hydrothermal alteration of monazite-(Ce) from the Santa Maria de Itabira pegmatite district (Minas Gerais, Brazil)

Abstract : Monazite-(Ce) is found in granitic pegmatites in the Santa Maria de Itabira pegmatite district (Minas Gerais, Brazil). During the magmatic stage, monazite-(Ce) seems to have had higher contents of cheralite and huttonite in the solid solution. The Th content in primary monazite-(Ce) is high and characteristic for each pegmatite body. During the late stage (albitization), the mean LREE content in the altered zone is slightly higher and Th content is very low. The accessory mineral assemblages changed; huttonite and cheralite crystallize together with Th-poor and La-rich monazite-(Ce) at the border of altered crystals. Nd/Sm and U/Pb ratios are also changed during the hydrothermal stage.
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https://hal-emse.ccsd.cnrs.fr/emse-00613225
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Submitted on : Wednesday, August 3, 2011 - 4:00:14 PM
Last modification on : Wednesday, March 4, 2020 - 12:12:02 PM

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Essaïd Bilal, Vitoria Marciano, Kazuo Fuzikawa, Bruno Fernando Riffel, Hermínio Arias Nalini Jr., et al.. Hydrothermal alteration of monazite-(Ce) from the Santa Maria de Itabira pegmatite district (Minas Gerais, Brazil). Comptes rendus de l’Académie des sciences. Série IIa, Sciences de la terre et des planètes, Elsevier, 1998, 326 (10), pp.693-700. ⟨10.1016/S1251-8050(98)80180-8⟩. ⟨emse-00613225⟩

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