Mineralogy and origin of vein wolframite mineralization from the Pohled quarry, Havlíčkův Brod Ore District, Czech Republic: Interaction of magmatic and basinal fluids

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F24%3A10136471" target="_blank" >RIV/00023272:_____/24:10136471 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/24:00138746

Výsledek na webu

<a href="https://www.mdpi.com/2075-163X/14/6/610" target="_blank" >https://www.mdpi.com/2075-163X/14/6/610</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/min14060610" target="_blank" >10.3390/min14060610</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mineralogy and origin of vein wolframite mineralization from the Pohled quarry, Havlíčkův Brod Ore District, Czech Republic: Interaction of magmatic and basinal fluids

Popis výsledku v původním jazyce

Mineralogy and formation conditions were studied in a newly found vein wolframite mineralization, cutting migmatitized paragneisses in the exocontact of a small Carboniferous granite body in the Pohled quarry, Moldanubian Zone of the Bohemian Massif, Czech Republic. The early stage of the rich mineral assemblage (36 mineral species) involves wolframite, columbite-group minerals, molybdenite, and scheelite hosted by quartz-muscovite-chlorite gangue, which was followed by base-metal sulfides in a quartz gangue, whereas the last stage included calcite gangue with fluorite and minor sulfides. A fluid inclusion study indicates a significant decrease in homogenization temperatures from 350-370 oC to less than 100 oC during vein formation. Fluids were aqueous, with a low salinity (0-12 wt. % NaCl eq.) and traces of CO2, N2, CH4, H2, and C2H6. The δ18O values of the fluids giving rise to quartz and scheelite are positive (min. 4%o-6%o V-SMOW). The Eh and pH of the fluid also changed during evolution of the vein. Both wolframite and columbite-group minerals are anomalously enriched in Mg. We suggest that the origin of this distinct mineralization was related to the mixing of Mo,W-bearing granite-derived magmatic fluids with external basinal waters derived from contemporaneous freshwater (but episodically evaporated) piedmont basins. The basinal waters infiltrated into the subsurface along fractures formed in the extensional tectonic regime, and their circulation continued even after the ending of the activity of magmatic fluids. The studied wolframite mineralization represents the most complete record of the &apos;hydrothermal&apos; history of a site adjacent to a cooling granite body in the study area.

Název v anglickém jazyce

Mineralogy and origin of vein wolframite mineralization from the Pohled quarry, Havlíčkův Brod Ore District, Czech Republic: Interaction of magmatic and basinal fluids

Popis výsledku anglicky

Mineralogy and formation conditions were studied in a newly found vein wolframite mineralization, cutting migmatitized paragneisses in the exocontact of a small Carboniferous granite body in the Pohled quarry, Moldanubian Zone of the Bohemian Massif, Czech Republic. The early stage of the rich mineral assemblage (36 mineral species) involves wolframite, columbite-group minerals, molybdenite, and scheelite hosted by quartz-muscovite-chlorite gangue, which was followed by base-metal sulfides in a quartz gangue, whereas the last stage included calcite gangue with fluorite and minor sulfides. A fluid inclusion study indicates a significant decrease in homogenization temperatures from 350-370 oC to less than 100 oC during vein formation. Fluids were aqueous, with a low salinity (0-12 wt. % NaCl eq.) and traces of CO2, N2, CH4, H2, and C2H6. The δ18O values of the fluids giving rise to quartz and scheelite are positive (min. 4%o-6%o V-SMOW). The Eh and pH of the fluid also changed during evolution of the vein. Both wolframite and columbite-group minerals are anomalously enriched in Mg. We suggest that the origin of this distinct mineralization was related to the mixing of Mo,W-bearing granite-derived magmatic fluids with external basinal waters derived from contemporaneous freshwater (but episodically evaporated) piedmont basins. The basinal waters infiltrated into the subsurface along fractures formed in the extensional tectonic regime, and their circulation continued even after the ending of the activity of magmatic fluids. The studied wolframite mineralization represents the most complete record of the &apos;hydrothermal&apos; history of a site adjacent to a cooling granite body in the study area.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

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

6

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

51

Strana od-do

1-51

Kód UT WoS článku

001256255800001

EID výsledku v databázi Scopus

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