Mineralogical and fluid inclusion evidence for reworking of Au(-Bi) mineralization by Ag-Sb-base metal-rich fluids from the Bytíz deposit, Příbram uranium and base-metal ore district, Czech Republic

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F22%3A10135682" target="_blank" >RIV/00023272:_____/22:10135682 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/2075-163X/12/12/1539" target="_blank" >https://www.mdpi.com/2075-163X/12/12/1539</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/min12121539" target="_blank" >10.3390/min12121539</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mineralogical and fluid inclusion evidence for reworking of Au(-Bi) mineralization by Ag-Sb-base metal-rich fluids from the Bytíz deposit, Příbram uranium and base-metal ore district, Czech Republic

Popis výsledku v původním jazyce

This mineralogical and fluid inclusion study was conducted on an Au-bearing quartz-sulfide vein encountered in the deep parts of the Bytíz deposit in the Příbram uranium and base-metal district, Bohemian Massif, Czech Republic. The samples were taken where the Au-bearing vein is crosscut by the common base-metal Zn-Pb ore vein Bt23C. The early mineralization of the Au-bearing vein is composed mainly of quartz (Q-1 to Q-3), illite-muscovite, Fe-Mg chlorite, arsenopyrite, and Au-Ag alloys, showing a wide range of compositions (4-69 at. % Ag) and a decrease in Au/(Au + Ag) ratios during vein evolution. Younger hydrothermal processes led to the crystallization of nests and veinlets composed of late quartz (Q-4), carbonates (siderite, dolomite-ankerite and calcite), base-metal sulfides (galena, sphalerite, chalcopyrite, and tetrahedrite), a suite of Ag and Bi-tellurides, and acanthite. The input of Sb is manifested by the partial to complete replacement of some gold grains by aurostibite and an unnamed (Ag,Au)-Sb oxide with a composition close to AuSbO3. The fluid inclusion study, combined with chlorite thermometry and arsenopyrite thermometry, showed that the early mineralization crystallized from progressively cooled (from 300 to 400 oC down to ca. 180 oC), diluted (1.2-7.0 wt. % NaCl eq.) aqueous solutions. The late portion of the mineralization formed from aqueous fluids with highly variable salinity (0.2-23.4 wt. % NaCl eq.) and homogenization temperatures decreasing from ca. 250 oC to &lt; 50 oC, which compare well with the base-metal mineralization of the vein Bt23C and other base-metal veins of the Příbram ore area. Our study illustrates the nature and intensity of the processes of the reworking of the early gold mineralization mediated by the younger Ag,Sb-rich base-metal fluids, giving rise to Příbram&apos;s typical late-Variscan vein Zn-Pb mineralization.

Název v anglickém jazyce

Mineralogical and fluid inclusion evidence for reworking of Au(-Bi) mineralization by Ag-Sb-base metal-rich fluids from the Bytíz deposit, Příbram uranium and base-metal ore district, Czech Republic

Popis výsledku anglicky

This mineralogical and fluid inclusion study was conducted on an Au-bearing quartz-sulfide vein encountered in the deep parts of the Bytíz deposit in the Příbram uranium and base-metal district, Bohemian Massif, Czech Republic. The samples were taken where the Au-bearing vein is crosscut by the common base-metal Zn-Pb ore vein Bt23C. The early mineralization of the Au-bearing vein is composed mainly of quartz (Q-1 to Q-3), illite-muscovite, Fe-Mg chlorite, arsenopyrite, and Au-Ag alloys, showing a wide range of compositions (4-69 at. % Ag) and a decrease in Au/(Au + Ag) ratios during vein evolution. Younger hydrothermal processes led to the crystallization of nests and veinlets composed of late quartz (Q-4), carbonates (siderite, dolomite-ankerite and calcite), base-metal sulfides (galena, sphalerite, chalcopyrite, and tetrahedrite), a suite of Ag and Bi-tellurides, and acanthite. The input of Sb is manifested by the partial to complete replacement of some gold grains by aurostibite and an unnamed (Ag,Au)-Sb oxide with a composition close to AuSbO3. The fluid inclusion study, combined with chlorite thermometry and arsenopyrite thermometry, showed that the early mineralization crystallized from progressively cooled (from 300 to 400 oC down to ca. 180 oC), diluted (1.2-7.0 wt. % NaCl eq.) aqueous solutions. The late portion of the mineralization formed from aqueous fluids with highly variable salinity (0.2-23.4 wt. % NaCl eq.) and homogenization temperatures decreasing from ca. 250 oC to &lt; 50 oC, which compare well with the base-metal mineralization of the vein Bt23C and other base-metal veins of the Příbram ore area. Our study illustrates the nature and intensity of the processes of the reworking of the early gold mineralization mediated by the younger Ag,Sb-rich base-metal fluids, giving rise to Příbram&apos;s typical late-Variscan vein Zn-Pb mineralization.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10504 - Mineralogy

Projekt

<a href="/cs/project/GA19-16218S" target="_blank" >GA19-16218S: Komplexní Ag-(Sb,As) bonanzové mineralizace příbramského uran-polymetalického revíru - modelový případ vzniku extrémně bohatých rudních akumulací</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Minerals

ISSN

2075-163X

e-ISSN

—

Svazek periodika

12

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

38

Strana od-do

1-38

Kód UT WoS článku

000903066700001

EID výsledku v databázi Scopus

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