Pegmatite REE-mineral association from the Kroushev Dol base metal deposit (south Bulgaria): mineral replacements and timing of formation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F23%3A00144148" target="_blank" >RIV/00216224:14310/23:00144148 - 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

Pegmatite REE-mineral association from the Kroushev Dol base metal deposit (south Bulgaria): mineral replacements and timing of formation

Popis výsledku v původním jazyce

The region of the Central Rhodopes, south Bulgaria, is known for large Pb-Zn deposits located in the Madan and Laki districts. The economic sulphide mineralization is hosted by the high-grade rocks of the Rhodope metamorphic complex. Mining operations revealed that pegmatite injections into the host gneisses, amphibolites and marbles represent a substantial part of the wall rocks in depth. Mineral composition of these dykes is represented by K-feldspar, plagioclases, and quartz as major constituents. In the pegmatites from the Kroushev Dol deposit (Madan district), REE-bearing mineralization includes accessory monazite, zircon, apatite, allanite, titanite, and thorite. Primary minerals of REE are monazite (LREE) and zircon (HREE); the REE were consequently redistributed among secondary apatite, allanite, thorite, and titanite. Common mineral breakdowns (e.g. oligoclase to albite; monazite to apatite; allanite to epidote; titanite to anatase) and replacement of the primary pegmatite minerals by the epidote-chlorite-carbonate association were caused by hydrothermal alteration by acid Pb-Zn ore-precipitating fluids. There seems to be no genetic link between the pegmatite emplacement and the economic galena-sphalerite accumulations and the U-Pb geochronometry on monazite, zircon and titanite proved that pegmatite formation (similar to 40 Ma) significantly precedes the origin of the base metal mineralization (similar to 30 Ma).

Název v anglickém jazyce

Pegmatite REE-mineral association from the Kroushev Dol base metal deposit (south Bulgaria): mineral replacements and timing of formation

Popis výsledku anglicky

The region of the Central Rhodopes, south Bulgaria, is known for large Pb-Zn deposits located in the Madan and Laki districts. The economic sulphide mineralization is hosted by the high-grade rocks of the Rhodope metamorphic complex. Mining operations revealed that pegmatite injections into the host gneisses, amphibolites and marbles represent a substantial part of the wall rocks in depth. Mineral composition of these dykes is represented by K-feldspar, plagioclases, and quartz as major constituents. In the pegmatites from the Kroushev Dol deposit (Madan district), REE-bearing mineralization includes accessory monazite, zircon, apatite, allanite, titanite, and thorite. Primary minerals of REE are monazite (LREE) and zircon (HREE); the REE were consequently redistributed among secondary apatite, allanite, thorite, and titanite. Common mineral breakdowns (e.g. oligoclase to albite; monazite to apatite; allanite to epidote; titanite to anatase) and replacement of the primary pegmatite minerals by the epidote-chlorite-carbonate association were caused by hydrothermal alteration by acid Pb-Zn ore-precipitating fluids. There seems to be no genetic link between the pegmatite emplacement and the economic galena-sphalerite accumulations and the U-Pb geochronometry on monazite, zircon and titanite proved that pegmatite formation (similar to 40 Ma) significantly precedes the origin of the base metal mineralization (similar to 30 Ma).

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/TH79020002" target="_blank" >TH79020002: Vyvinuté magmatické a pegmatitové systémy jako zdroje kritických surovin a průmyslových minerálů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

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

—

e-ISSN

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Počet stran výsledku

4

Strana od-do

242-245

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

001238045900064