Origin of Zn-Pb mineralization of the vein Bt23C, Bytíz deposit, Příbram uranium and base-metal ore district, Czech Republic: constraints from occurrence of immiscible aqueous-carbonic fluids

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F24%3A10136165" target="_blank" >RIV/00023272:_____/24:10136165 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/2075-163X/14/1/87" target="_blank" >https://www.mdpi.com/2075-163X/14/1/87</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/min14010087" target="_blank" >10.3390/min14010087</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Origin of Zn-Pb mineralization of the vein Bt23C, Bytíz deposit, Příbram uranium and base-metal ore district, Czech Republic: constraints from occurrence of immiscible aqueous-carbonic fluids

Popis výsledku v původním jazyce

The mineralogical, fluid inclusion, and stable isotope (C, O) study was conducted on a Zn-Pb vein Bt23C, Příbram uranium and base-metal district. Siderite, dolomite-ankerite, calcite, quartz, baryte, galena, sphalerite, V-rich mica and chlorite (chamosite) form the vein samples studied. The fluid inclusion study proved a complicated fluid evolution, related to activity of aqueous fluids and an episode involving an aqueous-carbonic fluid mixture. Homogenization temperatures of aqueous inclusions decrease from ~210 oC to ~50 oC and salinity varied significantly from pure water up to 27 wt. % NaCl eq. The aqueous-carbonic fluid inclusions hosted by quartz contain accidental mixtures of a carbonic phase and an aqueous solution. Carbonic phase is dominated by CO2 with minor CH4 and N2 and associated water phase has a medium salinity (6MINUS SIGN 14 wt. % NaCl eq.). The low calculated fluid d18O values (-4.7 to +3.6 %o V-SMOW) suggest a predominance of surficial waters. The participation of three fluid endmembers is probable: (i) early high-temperature high-salinity Na&gt;Ca-Cl fluids from a &quot;deep&quot; source; (ii) late low-salinity low-temperature waters, likely infiltrating from Permian freshwater partly evaporated piedmont basins; (iii) late high-salinity chloridic solutions with both high and low Ca/Na ratios, which can represent externally derived marine brines, and/or local shield brines. The source of volatiles can be in (i) deep crust, (ii) interactions of fluids with wall sedimentary rocks, (iii) overlying Permian piedmont basins containing in places coal seams. The event dealing with CO2-bearing fluid yielded constraints on pressure conditions of ore formation (100-270 bar) as well as on clarification of some additional genetic aspects of the Příbram&apos;s ores, including the reasons of widespread dissolution of older vein fill, possible re-cycling of some ore-forming components, pH changes, and occasionally observed carbon isotope shift due to CO2 degassing.

Název v anglickém jazyce

Origin of Zn-Pb mineralization of the vein Bt23C, Bytíz deposit, Příbram uranium and base-metal ore district, Czech Republic: constraints from occurrence of immiscible aqueous-carbonic fluids

Popis výsledku anglicky

The mineralogical, fluid inclusion, and stable isotope (C, O) study was conducted on a Zn-Pb vein Bt23C, Příbram uranium and base-metal district. Siderite, dolomite-ankerite, calcite, quartz, baryte, galena, sphalerite, V-rich mica and chlorite (chamosite) form the vein samples studied. The fluid inclusion study proved a complicated fluid evolution, related to activity of aqueous fluids and an episode involving an aqueous-carbonic fluid mixture. Homogenization temperatures of aqueous inclusions decrease from ~210 oC to ~50 oC and salinity varied significantly from pure water up to 27 wt. % NaCl eq. The aqueous-carbonic fluid inclusions hosted by quartz contain accidental mixtures of a carbonic phase and an aqueous solution. Carbonic phase is dominated by CO2 with minor CH4 and N2 and associated water phase has a medium salinity (6MINUS SIGN 14 wt. % NaCl eq.). The low calculated fluid d18O values (-4.7 to +3.6 %o V-SMOW) suggest a predominance of surficial waters. The participation of three fluid endmembers is probable: (i) early high-temperature high-salinity Na&gt;Ca-Cl fluids from a &quot;deep&quot; source; (ii) late low-salinity low-temperature waters, likely infiltrating from Permian freshwater partly evaporated piedmont basins; (iii) late high-salinity chloridic solutions with both high and low Ca/Na ratios, which can represent externally derived marine brines, and/or local shield brines. The source of volatiles can be in (i) deep crust, (ii) interactions of fluids with wall sedimentary rocks, (iii) overlying Permian piedmont basins containing in places coal seams. The event dealing with CO2-bearing fluid yielded constraints on pressure conditions of ore formation (100-270 bar) as well as on clarification of some additional genetic aspects of the Příbram&apos;s ores, including the reasons of widespread dissolution of older vein fill, possible re-cycling of some ore-forming components, pH changes, and occasionally observed carbon isotope shift due to CO2 degassing.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

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

14

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

33

Strana od-do

1-33

Kód UT WoS článku

001153154600001

EID výsledku v databázi Scopus

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