Mineralogy of molybdenite-bearing quartz vein from Pohled quarry, Havlíčkův Brod Ore District (Czech Republic)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F23%3A00142702" target="_blank" >RIV/00216224:14310/23:00142702 - isvavai.cz</a>

Alternative codes found

RIV/26232511:_____/23:N0000078

Result on the web

<a href="http://scigeo.actamm.cz/cs/mineralogicka-charakteristika-zilne-kremenne-mineralizace-s-molybdenitem-z-lomu-pohled-havlickobrodsky-rudni-revir-ceska-republika/" target="_blank" >http://scigeo.actamm.cz/cs/mineralogicka-charakteristika-zilne-kremenne-mineralizace-s-molybdenitem-z-lomu-pohled-havlickobrodsky-rudni-revir-ceska-republika/</a>

DOI - Digital Object Identifier

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Result language

čeština

Original language name

Mineralogická charakteristika žilné křemenné mineralizace s molybdenitem z lomu Pohled, havlíčkobrodský rudní revír (Česká republika)

Original language description

A mineralogical study of a poorly mineralized quartz vein with macroscopic molybdenite, cutting biotite paragneisses in the Pohled quarry (Moldanubicum), revealed a very rich mineral assemblage involving 24 species. In addition to quartz (belonging probably to several populations) and molybdenite, we proved the presence of pyrrhotite, pyrite, marcasite, chalcopyrite, cobaltite, arsenopyrite, galena, gustavite, native bismuth, joséite-A, Te-rich zipserite, anatase, brookite, uraninite, coffinite, hydroxylsynchysite-(Ce), baryte, muscovite, chamosite, clinochlore, fluorapatite, K-feldspar, and calcite. Apart from calcite, which fills youngest veinlets cutting the quartz vein, all remaining minerals form small disseminations in a quartz gangue; in some cases, these minerals probably represent components of older quartz-rich veinlets. The textural development and chemical compositions of minerals indicate that temperature decreased significantly during evolution of the vein – from 350–370 °C in early stage to up to 160 °C in the late stage. The Eh and pH of the fluid also experienced significant changes during evolution of the vein. The presence of hardly remobilizable elements in the given mineralization, including W, Sn, Zr, Nb, Th, Ti, Sc, Y, and REEs, suggests that specific complexing ligands (likely fluoride and/or sulphate anions) were present in the fluids. Broad similarities are found when texture and compositions of a number of silicate and sulphide minerals are compared with those from other types of mineralization in the quarry Pohled. This implies for cogenetic nature of various types of hydrothermal mineralizations and continuous evolution of the hydrothermal system, with variable local representation of individual mineralizing stages. The differences in chemical compositions of some minerals can be at least in some cases explained by topomineral influence of host rocks (the local source of Co and Ni in small bodies of amphibolites and serpentinites, source of W and Mo in granitoids).

Czech name

Mineralogická charakteristika žilné křemenné mineralizace s molybdenitem z lomu Pohled, havlíčkobrodský rudní revír (Česká republika)

Czech description

A mineralogical study of a poorly mineralized quartz vein with macroscopic molybdenite, cutting biotite paragneisses in the Pohled quarry (Moldanubicum), revealed a very rich mineral assemblage involving 24 species. In addition to quartz (belonging probably to several populations) and molybdenite, we proved the presence of pyrrhotite, pyrite, marcasite, chalcopyrite, cobaltite, arsenopyrite, galena, gustavite, native bismuth, joséite-A, Te-rich zipserite, anatase, brookite, uraninite, coffinite, hydroxylsynchysite-(Ce), baryte, muscovite, chamosite, clinochlore, fluorapatite, K-feldspar, and calcite. Apart from calcite, which fills youngest veinlets cutting the quartz vein, all remaining minerals form small disseminations in a quartz gangue; in some cases, these minerals probably represent components of older quartz-rich veinlets. The textural development and chemical compositions of minerals indicate that temperature decreased significantly during evolution of the vein – from 350–370 °C in early stage to up to 160 °C in the late stage. The Eh and pH of the fluid also experienced significant changes during evolution of the vein. The presence of hardly remobilizable elements in the given mineralization, including W, Sn, Zr, Nb, Th, Ti, Sc, Y, and REEs, suggests that specific complexing ligands (likely fluoride and/or sulphate anions) were present in the fluids. Broad similarities are found when texture and compositions of a number of silicate and sulphide minerals are compared with those from other types of mineralization in the quarry Pohled. This implies for cogenetic nature of various types of hydrothermal mineralizations and continuous evolution of the hydrothermal system, with variable local representation of individual mineralizing stages. The differences in chemical compositions of some minerals can be at least in some cases explained by topomineral influence of host rocks (the local source of Co and Ni in small bodies of amphibolites and serpentinites, source of W and Mo in granitoids).

Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

10500 - Earth and related environmental sciences

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2023

Confidentiality

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

Name of the periodical

Acta Musei Moraviae, Scientiae Geologicae

ISSN

1211-8796

e-ISSN

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Volume of the periodical

108

Issue of the periodical within the volume

2

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

26

Pages from-to

145-170

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85176923464