Publication details
Redistribution of incompatible elements during hydrothermal alteration of pegmatite from the Djurkovo Pb-Zn deposit, Central Rhodopes
| Authors | |
|---|---|
| Year of publication | 2023 |
| Type | Article in Periodical |
| Magazine / Source | Review of the Bulgarian Geological Society |
| MU Faculty or unit | |
| Citation | |
| Web | https://bgd.bg/REVIEW_BGS/REVIEW_BGD_2023_3/PDF/06_Georgieva-S_Rev_BGS_2023-3.pdf |
| Doi | http://dx.doi.org/10.52215/rev.bgs.2023.84.3.35 |
| Keywords | pegmatites; (REE plus Y; U; Th)-(Nb; Ta; Ti) oxide minerals; ishikawaite; fergusonite; fersmite |
| Description | Mineralogical and geochemical study was done on weakly deformed, relatively thin pegmatites that in-truded 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 ex-cept 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 pegma-tites 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. |