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

DOLNÍČEK, Zdeněk; Jana ULMANOVÁ; Karel MALÝ; Jaroslav HAVLÍČEK; Michaela KREJČÍ KOTLÁNOVÁ a Rostislav KOUTŇÁK. Mineralogická charakteristika žilné křemenné mineralizace s molybdenitem z lomu Pohled, havlíčkobrodský rudní revír (Česká republika). Acta Musei Moraviae, Scientiae Geologicae. Moravian Museum, 2023, roč. 108, č. 2, s. 145-170. ISSN 1211-8796.

Základní údaje

Originální název

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

Název anglicky

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

Autoři

DOLNÍČEK, Zdeněk; Jana ULMANOVÁ; Karel MALÝ; Jaroslav HAVLÍČEK; Michaela KREJČÍ KOTLÁNOVÁ a Rostislav KOUTŇÁK

Vydání

Acta Musei Moraviae, Scientiae Geologicae, Moravian Museum, 2023, 1211-8796

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Další údaje

Jazyk

čeština

Typ výsledku

Článek v odborném periodiku

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Organizační jednotka

Přírodovědecká fakulta

EID Scopus

2-s2.0-85176923464

Klíčová slova anglicky

Havlíčkův Brod Ore District; Pohled quarry; ore veins; molybdenite; hydrothermal alteration

Štítky

14315010, rivok

Příznaky

Recenzováno

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Anotace

V originále

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).

Anglicky

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).