Rare-earth element mineralization in altered pegmatites from the Djurkovo Pb-Zn deposit, Central Rhodopes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F23%3A00142074" target="_blank" >RIV/00216224:14310/23:00142074 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.e-sga.org/fileadmin/PDF/Conference_proceedings/Zuerich/SGA_2023_Zurich_Volume_1.pdf" target="_blank" >https://www.e-sga.org/fileadmin/PDF/Conference_proceedings/Zuerich/SGA_2023_Zurich_Volume_1.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Rare-earth element mineralization in altered pegmatites from the Djurkovo Pb-Zn deposit, Central Rhodopes

Popis výsledku v původním jazyce

The Djurkovo polymetallic vein deposit is formed by veins filling open space in various gneisses that compose the high-grade metamorphic complex in the Central Rhodopes. Abundant deformed concordant or crosscutting pegmatites of varying thickness are common in the metamorphic sequence. The studied pegmatite dykes consist mainly of plagioclase, K-feldspar, quartz, and minor micas. The main accessory minerals are allanite- (Ce), titanite, apatite and zircon. Late hydrothermal overprint and alteration of pegmatites led to formation of epidote-group minerals, adularia, albite, sericite, chlorite, carbonate, quartz and leucoxene. The secondary minerals also include rare earth element (REE+Y) and Th, U fluorcarbonate - phosphate - oxide assemblages. This mineral association typically occurs as very fine-grained (. 20 mu m) anhedral disseminations, observed along fractures and dissolved zones in allanite and titanite that evidently are the main source for the REEs. This indicates remobilization of REEs followed by formation of new phases during the late-stage hydrothermal activity. Limited mobility of REEs is illustrated by precipitation of the newly-formed minerals within the grains of the altered accessory minerals. The studied pegmatites retain a significant amount of accessory minerals rich in incompatible elements and despite being hydrothermally altered they could be considered as their potential source.

Název v anglickém jazyce

Rare-earth element mineralization in altered pegmatites from the Djurkovo Pb-Zn deposit, Central Rhodopes

Popis výsledku anglicky

The Djurkovo polymetallic vein deposit is formed by veins filling open space in various gneisses that compose the high-grade metamorphic complex in the Central Rhodopes. Abundant deformed concordant or crosscutting pegmatites of varying thickness are common in the metamorphic sequence. The studied pegmatite dykes consist mainly of plagioclase, K-feldspar, quartz, and minor micas. The main accessory minerals are allanite- (Ce), titanite, apatite and zircon. Late hydrothermal overprint and alteration of pegmatites led to formation of epidote-group minerals, adularia, albite, sericite, chlorite, carbonate, quartz and leucoxene. The secondary minerals also include rare earth element (REE+Y) and Th, U fluorcarbonate - phosphate - oxide assemblages. This mineral association typically occurs as very fine-grained (. 20 mu m) anhedral disseminations, observed along fractures and dissolved zones in allanite and titanite that evidently are the main source for the REEs. This indicates remobilization of REEs followed by formation of new phases during the late-stage hydrothermal activity. Limited mobility of REEs is illustrated by precipitation of the newly-formed minerals within the grains of the altered accessory minerals. The studied pegmatites retain a significant amount of accessory minerals rich in incompatible elements and despite being hydrothermally altered they could be considered as their potential source.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10505 - Geology

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

17th Biennial SGA Meeting - Proceedings Volume 1

ISBN

9782839940443

ISSN

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e-ISSN

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Počet stran výsledku

4

Strana od-do

238-241

Název nakladatele

Society for Geology Applied to Mineral Deposits

Místo vydání

Geneva

Místo konání akce

Zurich, Switzerland

Datum konání akce

28. 8. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001238045900063