Fluid Evolution of Greisens from Krupka Sn-W Ore District, Bohemian Massif (Czech Republic)
The Sn-W ore deposits in the Krupka surroundings are associated with greisens, which occur in the upper parts of Late Variscan granitoid intrusions. Fluid inclusions were studied in samples of quartz, cassiterite, apatite, fluorite, and topaz in greisenized granites, greisens, and hydrothermal veins...
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| Format: | Article |
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MDPI AG
2024-01-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/14/1/86 |
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| author | Michaela Krejčí Kotlánová Zdeněk Dolníček Miloš René Walter Prochaska Jana Ulmanová Jaroslav Kapusta Vlastimil Mašek Kamil Kropáč |
| author_facet | Michaela Krejčí Kotlánová Zdeněk Dolníček Miloš René Walter Prochaska Jana Ulmanová Jaroslav Kapusta Vlastimil Mašek Kamil Kropáč |
| author_sort | Michaela Krejčí Kotlánová |
| collection | DOAJ |
| description | The Sn-W ore deposits in the Krupka surroundings are associated with greisens, which occur in the upper parts of Late Variscan granitoid intrusions. Fluid inclusions were studied in samples of quartz, cassiterite, apatite, fluorite, and topaz in greisenized granites, greisens, and hydrothermal veins with Sn-W mineralization. The greisenization process took place at temperatures 370–490 °C and pressures 155–371 bars, and associated fluids had predominantly low salinity and a low gas (CO<sub>2</sub>, N<sub>2</sub> and CH<sub>4</sub>) content. The post-greisenization stage was connected with the formation of (i) low-salinity (0–8 wt. % NaCl eq.) fluid inclusions with homogenization temperatures <120–295 °C and (ii) high-salinity (18 to >35 wt. % NaCl eq.) fluid inclusions with homogenization temperatures 140–370 °C, often containing trapped crystals of quartz, topaz, and sulfides, or daughter crystals of salts and carbonates, which were identified by microthermometric measurements, electron microprobe analysis, and Raman spectroscopy. Analyses of fluid inclusion leachates have shown that Na and Ca chlorides predominate in fluids. According to hydrogen stable isotopes, the source of greisenizing and post-greisenizing fluids was not only magmatogenic but also meteoric water or fluids derived from sedimentary rocks. |
| first_indexed | 2024-03-08T10:39:49Z |
| format | Article |
| id | doaj.art-e1aa95d58f4b492788db73df38d0f9ab |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-08T10:39:49Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-e1aa95d58f4b492788db73df38d0f9ab2024-01-26T17:52:51ZengMDPI AGMinerals2075-163X2024-01-011418610.3390/min14010086Fluid Evolution of Greisens from Krupka Sn-W Ore District, Bohemian Massif (Czech Republic)Michaela Krejčí Kotlánová0Zdeněk Dolníček1Miloš René2Walter Prochaska3Jana Ulmanová4Jaroslav Kapusta5Vlastimil MašekKamil Kropáč6Department of Geological Sciences, Masaryk University, Kotlářská 267/2, 611 37 Brno, Czech RepublicDepartment of Mineralogy and Petrology, National Museum, Cirkusová 1740, 193 00 Praha, Czech RepublicInstitute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, V Holešovičkách 94/41, 182 09 Praha, Czech RepublicÖsterreichisches Archäologisches Institut, Franz Klein-Gasse 1, 1190 Wien, AustriaDepartment of Mineralogy and Petrology, National Museum, Cirkusová 1740, 193 00 Praha, Czech RepublicDepartment of Geology, Palacký University, 17. Listopadu 1192/12, 771 46 Olomouc, Czech RepublicDepartment of Geology, Palacký University, 17. Listopadu 1192/12, 771 46 Olomouc, Czech RepublicThe Sn-W ore deposits in the Krupka surroundings are associated with greisens, which occur in the upper parts of Late Variscan granitoid intrusions. Fluid inclusions were studied in samples of quartz, cassiterite, apatite, fluorite, and topaz in greisenized granites, greisens, and hydrothermal veins with Sn-W mineralization. The greisenization process took place at temperatures 370–490 °C and pressures 155–371 bars, and associated fluids had predominantly low salinity and a low gas (CO<sub>2</sub>, N<sub>2</sub> and CH<sub>4</sub>) content. The post-greisenization stage was connected with the formation of (i) low-salinity (0–8 wt. % NaCl eq.) fluid inclusions with homogenization temperatures <120–295 °C and (ii) high-salinity (18 to >35 wt. % NaCl eq.) fluid inclusions with homogenization temperatures 140–370 °C, often containing trapped crystals of quartz, topaz, and sulfides, or daughter crystals of salts and carbonates, which were identified by microthermometric measurements, electron microprobe analysis, and Raman spectroscopy. Analyses of fluid inclusion leachates have shown that Na and Ca chlorides predominate in fluids. According to hydrogen stable isotopes, the source of greisenizing and post-greisenizing fluids was not only magmatogenic but also meteoric water or fluids derived from sedimentary rocks.https://www.mdpi.com/2075-163X/14/1/86KrupkaBohemian MassifgreisenSn-W mineralizationfluid inclusionsstable isotopes of hydrogen |
| spellingShingle | Michaela Krejčí Kotlánová Zdeněk Dolníček Miloš René Walter Prochaska Jana Ulmanová Jaroslav Kapusta Vlastimil Mašek Kamil Kropáč Fluid Evolution of Greisens from Krupka Sn-W Ore District, Bohemian Massif (Czech Republic) Minerals Krupka Bohemian Massif greisen Sn-W mineralization fluid inclusions stable isotopes of hydrogen |
| title | Fluid Evolution of Greisens from Krupka Sn-W Ore District, Bohemian Massif (Czech Republic) |
| title_full | Fluid Evolution of Greisens from Krupka Sn-W Ore District, Bohemian Massif (Czech Republic) |
| title_fullStr | Fluid Evolution of Greisens from Krupka Sn-W Ore District, Bohemian Massif (Czech Republic) |
| title_full_unstemmed | Fluid Evolution of Greisens from Krupka Sn-W Ore District, Bohemian Massif (Czech Republic) |
| title_short | Fluid Evolution of Greisens from Krupka Sn-W Ore District, Bohemian Massif (Czech Republic) |
| title_sort | fluid evolution of greisens from krupka sn w ore district bohemian massif czech republic |
| topic | Krupka Bohemian Massif greisen Sn-W mineralization fluid inclusions stable isotopes of hydrogen |
| url | https://www.mdpi.com/2075-163X/14/1/86 |
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