REY+ACT redistribution in polymineral aggregates: a case study on monazite decomposition in pegmatite.

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Bibliographic Details
Title:	REY+ACT redistribution in polymineral aggregates: a case study on monazite decomposition in pegmatite.
Alternate Title:	Преразпределение на REY+ACT елементи в полиминерални агрегати при разпад на монацит в пегматит
Authors:	Vassileva, Rossitsa D.¹ rosivas@geology.bas.bg, Georgieva, Sylvina¹ sylvina@geology.bas.bg, Cempírek, Jan² jan.cemprek@gmail.com, Milenkov, Georgi¹ georgimilenkov7@gmail.com, Škoda, Radek² rskoda@sci.muni.cz
Source:	Review of the Bulgarian Geological Society. 2024, Vol. 85 Issue 2, p124-127. 4p.
Subjects:	Fluorapatite, Sphene, Monazite, Single crystals, Minerals, Apatite
Abstract:	Selected pegmatite dyke intruded within the gneiss-marble-amphibolite sequence of the Rhodope Metamorphic Complex was studied for its REY+ACT mineralization in attempt to assess the potential of these pegmatites for critical and strategic raw materials. Mineral composition of K-feldspar and albite is complemented by abundant common accessories of zircon, apatite, monazite, allanite, and titanite. The REY+ACT mineralization is presented as single euhedral crystals (zircon, thorianite, Y-Nb oxide, titanite and fluorapatite) or as complex multimineral nodule-like aggregates. The nodule core typically consists of decomposed Th-bearing monazite-(Ce) altered to different degree by intergrown Th-bearing apatite/thorite assemblage. Fluid-involved reactions led to mineral transformations and redistribution of the elements like LREE, Y, Th, U, and formation of the inhomogeneous allanite-(Ce)/REE-epidote rims enveloping the aggregated earlier phases. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Selected pegmatite dyke intruded within the gneiss-marble-amphibolite sequence of the Rhodope Metamorphic Complex was studied for its REY+ACT mineralization in attempt to assess the potential of these pegmatites for critical and strategic raw materials. Mineral composition of K-feldspar and albite is complemented by abundant common accessories of zircon, apatite, monazite, allanite, and titanite. The REY+ACT mineralization is presented as single euhedral crystals (zircon, thorianite, Y-Nb oxide, titanite and fluorapatite) or as complex multimineral nodule-like aggregates. The nodule core typically consists of decomposed Th-bearing monazite-(Ce) altered to different degree by intergrown Th-bearing apatite/thorite assemblage. Fluid-involved reactions led to mineral transformations and redistribution of the elements like LREE, Y, Th, U, and formation of the inhomogeneous allanite-(Ce)/REE-epidote rims enveloping the aggregated earlier phases. [ABSTRACT FROM AUTHOR]
ISSN:	00073938
DOI:	10.52215/rev.bgs.2024.85.2.124