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Geochemical and structural evolution of micas in the Rožná and Dobrá Voda pegmatites, Czech Republic

Geochemische und strukturelle Entwicklung der Glimmer in den Pegmatiten von Rožná und Dobrá Voda, Tschechische Republik

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Summary

The chemistry, structural parameters, polytypism, optical properties and Rb-Sr isotopes were examined in 11 to 60 samples of biotite, muscovite and lepidolite from the pegmatites at Rožná (the type locality of lepidolite; 323 ± 4Ma) and Dobrá Voda (306 ± 9Ma) in western Moravia. At both localities, early endocontact biotite is followed inwards by muscovite and lepidolite, which is concentrated in and around the core. At Rožná, a 1M lepidolite follows after 2M1 muscovite but all later generations of lepidolite are 2M2, close to Tri50 Ply50 and in part associated with muscovite 2M1. At Dobrá Voda, all lepidolite types are 1M and free of muscovite, and the late varieties approximate Tri30 Ply70. At both localities, a trend of increasing μHF is indicated during the progress of mica crystallization, culminating in precipitation of topaz. Polytypism of lepidolite is not correlatable with any compositional or growth feature, or their combination. Throughout the mica crystallization, Rb/Cs decreases but K/Rb becomes reversed after an initial decrease. Boron is partitioned preferentially into muscovite (up to 1.10 wt.% B2O3) but Be, Zn, Mn and Sc are enhanced in lepidolite. A slight increase in Fe, Ba and Cl in the last generation of lepidolite might be possibly due to mixing of residual pegmatite fluids with metamorphic pore solutions.

Zusammenfassung

In 11 bis 60 Proben von Biotit, Muskovit und Lepidolith aus den Pegmatiten von Rožná (Typlokalität des Lepidoliths; 323 ± 9 Ma) in Westmähren wurden Chemie, Struktur-parameter, Polytypie, optische Eigenschaften und Rb-Sr-Isotopie untersucht. An beiden Lokalitäten wird früher Biotit an Endokontakten nach Innen von Muskovit und Lepidolith gefolgt, letzterer ist in und um den Kern konzentriert. In Rožná folgt 1M-Lepidolith auf 2M1-Muskovit, aber alle späteren Lepidolithgenerationen sind 2M2, nahe Tri50Ply50 und zum Teil mit 2M1-Muskovit vergesellschaftet. In Dobrá Voda sind alle Lepidolithe vom Typ 1M und frei von Muskovit, die späten Varietäten kommen Tri50Ply50 nahe. An beiden Lokalitäten ist während des Fortschreitens der Glimmerkristallisation eine Tendenz von steigendem μHF angezeigt, die in der Ausfällung von Topas ihren Höhepunkt findet. Die Polytypie des Lepidoliths kann nicht mit irgendeiner Eigenheit der Zusammensetzung oder des Wachstums korreliert worden, auch nicht mit einer Kombination von diesen. Während der ganzen Glimmerkristallisation nimmt Rb/Cs ab, aber die Tendenz von K/Rb ändert sich nach anfänglichem Abfall. Das Bor verteilt sich bevorzugt auf den Muskovit (bis zu 1.10 Gew. -% B2O3), aber die Be-, Zn-, Mn- und Sc-Gehalte sind im Lepidolith erhöht. Ein leichter Ansteig von Fe, Ba und Cl in der letzten Lepidolithgeneration könnte vielleicht durch eine Mischung von pegmatitischen Restlösungen mit metamorphen Porenlösungen verursacht sein.

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Author notes

  1. M. Nová

    Present address: Department of Mineralogy and Petrology, Moravian Museum, Brno, Czech Republic

Authors and Affiliations

  1. Department of Geological Sciences, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada

    P. Černý & R. Chapman

  2. Department of Mineralogy, Petrology and Geochemistry, Masaryk University, Kotláskâ 2, 61137, Brno, Czech Republic

    J. Staně

  3. Department of Mineralogy and Petrology, Moravian Museum, Zelny trh 6, 65937, Brno, Czech Republic

    M. Nová

  4. Department of Geology, University of Alberta, T6G 2F3, Edmonton, Alberta, Canada

    H. Baadsgaard

  5. Institute of Geological Sciences, Charles University, Albertov 6, 12843, Praha, Czech Republic

    M. Rieder

  6. Department of Mineralogy, Geochemistry and Crystallography, Charles University, Albertov 6, 12843, Praha, Czech Republic

    M. Kavalová

  7. CNR Centro di Studio per la Cristallochimica e la Cristallografia c/o Dipartimento di Science della Terra, University di Pavia, Via Abbiategrasso, 209, 1-27100, Pavia, Italy

    L. Ottolini

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Černý, P., Chapman, R., Staně, J. et al. Geochemical and structural evolution of micas in the Rožná and Dobrá Voda pegmatites, Czech Republic. Mineralogy and Petrology 55, 177–201 (1995). https://doi.org/10.1007/BF01162587

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