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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10504 - Mineralogy

Project

<a href="/en/project/GA19-16218S" target="_blank" >GA19-16218S: Complex Ag-(Sb,As) bonanza mineralizations in the Příbram uranium and base-metal district - model example of origin of strongly enriched ore bodies</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Minerals

ISSN

2075-163X

e-ISSN

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Volume of the periodical

14

Issue of the periodical within the volume

1

Country of publishing house

CH - SWITZERLAND

Number of pages

33

Pages from-to

1-33

UT code for WoS article

001153154600001

EID of the result in the Scopus database

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