Redistribution of incompatible elements during hydrothermal alteration of pegmatite from the Djurkovo Pb-Zn deposit, Central Rhodopes.

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Bibliographic Details
Title:	Redistribution of incompatible elements during hydrothermal alteration of pegmatite from the Djurkovo Pb-Zn deposit, Central Rhodopes.
Alternate Title:	Преразпределение на несъвместими елементи при хидротермални изменения на пегматити от Pb-Zn находище Джурково, Централни Родопи.
Authors:	Georgieva, Sylvina¹ sylvina@geology.bas.bg, Vassileva, Rossitsa D.¹ rosivas@geology.bas.bg, Grozdev, Valentin¹ valgrozdev@gmail.com, Milenkov, Georgi¹ georgimilenkov7@gmail.com, Cempírek, Jan² jan.cempirek@gmail.com, Škoda, Radek² rskoda@sci.muni.cz, Stefanova, Elitsa¹ elitsa.s@gmail.com
Source:	Review of the Bulgarian Geological Society. 2023, Vol. 84 Issue 3, p35-38. 4p.
Subjects:	Hydrothermal alteration, Oxide minerals, Sphene, Garnet, Pegmatites, Minerals
Abstract:	Mineralogical and geochemical study was done on weakly deformed, relatively thin pegmatites that intruded the marbles of the Rhodope metamorphic complex in the Djurkovo Pb-Zn deposit, Central Rhodopes. The pegmatites consist mainly of K-feldspar and quartz and contain minor garnet; the pegmatites lack clear zonation except for the preferable crystallization of the garnet in the central parts. The main accessory minerals are ishikawaite, zircon, monazite-(Ce), apatite, and titanite. The textural relationships indicate later hydrothermal alteration of pegmatites which led to the formation of albite, epidote, sericite, chlorite, carbonate, quartz and leucoxene. The (REE+Y, ACT, Nb, Ta, Ti)-bearing pegmatite minerals (oxides, silicates and phosphates) are partly leached and/or replaced by secondary ones. The newly-formed phases precipitated as anhedral grains along fractures and dissolved zones onto/ or close to the primary minerals due to the limited mobility of the incompatible elements in fluids conditioned by pH, ligand activity and temperature. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Mineralogical and geochemical study was done on weakly deformed, relatively thin pegmatites that intruded the marbles of the Rhodope metamorphic complex in the Djurkovo Pb-Zn deposit, Central Rhodopes. The pegmatites consist mainly of K-feldspar and quartz and contain minor garnet; the pegmatites lack clear zonation except for the preferable crystallization of the garnet in the central parts. The main accessory minerals are ishikawaite, zircon, monazite-(Ce), apatite, and titanite. The textural relationships indicate later hydrothermal alteration of pegmatites which led to the formation of albite, epidote, sericite, chlorite, carbonate, quartz and leucoxene. The (REE+Y, ACT, Nb, Ta, Ti)-bearing pegmatite minerals (oxides, silicates and phosphates) are partly leached and/or replaced by secondary ones. The newly-formed phases precipitated as anhedral grains along fractures and dissolved zones onto/ or close to the primary minerals due to the limited mobility of the incompatible elements in fluids conditioned by pH, ligand activity and temperature. [ABSTRACT FROM AUTHOR]
ISSN:	00073938
DOI:	10.52215/rev.bgs.2023.84.3.35