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Magnetomineralogy of the cordierite gneiss from the magnetic anomaly at Humpolec, Bohemian Moldanubicum (Czech Republic)

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Abstract

Magnetic properties as well as the magnetomineralogy were investigated in rocks underlying a 7 km long aeromagnetic anomaly situated in the Moldanubian crystalline unit of the Bohemian Massif. The anomaly is caused by highly magnetic cordierite gneiss forming a stripe of NE — SW direction east of the town of Humpolec, eastern Bohemia. Magnetic susceptibility and its anisotropy (AMS), natural remanent magnetization, field and temperature variations of susceptibility were measured. Optical study of thin sections, electron microprobe and Mössbauer studies were also used to reveal the carrier of the high susceptibility and the high NRM. There appear to be two major generations of Fe-Ti oxides: older hematite with ilmenite exsolutions (Ti-hematite) which is the dominant remanence phase, and younger magnetite, the dominant susceptibility phase, usually associated with rutile. This indicates a reaction Hematite + Ilmenite → Magnetite + + Rutile; the trace elements in magnetite, as well as texture and morphology of the oxide grains support this assertion. An additional minor portion of maghemite is revealed by Mössbauer and thermomagnetic results. The Ti-hematite belongs to the oldest mineral assemblage in the rock, despite its anhedral morphology. Inclusions in Ti-hematite, among which corundum and abundant paragonite occur, record a strongly peraluminous and probably disequilibrium association during the crystallization of the Ti-hematite.

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Authors and Affiliations

  1. Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science of the Charles University, Albertov 6, 128 43, Praha 2, Czech Republic

    Václav Procházka

  2. Institute of Chemical Techology, Technická 5, 166 28, Praha 6, Czech Republic

    Václav Procházka

  3. Boháčova 866/4, 149 00, Praha 4, Czech Republic

    Marta Chlupáčová

  4. Department of Inorganic Chemistry, Faculty of Science of the Charles University, Hlavova 8, 128 43, Praha 2, Czech Republic

    Daniel Nižňanský

  5. Institute of Petrology and Structural Geology, Faculty of Science of the Charles University, Albertov 6, 128 43, Praha 2, Czech Republic

    František Hrouda

  6. Department of Geology of Mineral Deposits, Faculty of Science of the Comenius University, Mlynská dolina G, 842 15, Bratislava, Slovakia

    Pavel Uher

  7. South-Bohemian Museum, Dukelská 1, 370 01, České Budějovice, Czech Republic

    Petr Rajlich

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  1. Václav Procházka
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  2. Marta Chlupáčová
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  4. František Hrouda
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  5. Pavel Uher
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Correspondence to Václav Procházka.

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Procházka, V., Chlupáčová, M., Nižňanský, D. et al. Magnetomineralogy of the cordierite gneiss from the magnetic anomaly at Humpolec, Bohemian Moldanubicum (Czech Republic). Stud Geophys Geod 54, 95–120 (2010). https://doi.org/10.1007/s11200-010-0005-y

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  • DOI: https://doi.org/10.1007/s11200-010-0005-y

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