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

Result code in 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>

Result on the web

<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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Result language

angličtina

Original language name

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

Original language description

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).

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10505 - Geology

Project

<a href="/en/project/TH79020002" target="_blank" >TH79020002: Evolved magmatic and pegmatitic systems as sources of critical raw materials and industrial minerals</a><br>

Continuities

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

Publication year

2023

Confidentiality

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

Article name in the collection

17th Biennial SGA Meeting - Proceedings Volume 1

ISBN

9782839940443

ISSN

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e-ISSN

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Number of pages

4

Pages from-to

242-245

Publisher name

Society for Geology Applied to Mineral Deposits

Place of publication

Geneva

Event location

Zurich, SWITZERLAND

Event date

Aug 28, 2023

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

001238045900064