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Cenozoic Intraplate Alkaline Volcanism of Western Bohemia

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Abstract

Three independent volcanic suites have been recognised in W Bohemia: (i) the old unimodal alkaline ol. nephelinite-tephrite (29-19 Ma) in the Ohře Rift, (ii) two contemporaneous weakly (trachybasalt/trachyandesite-trachyte/rhyolite; 13-11 Ma) and strongly (ol. nephelinite-tephrite/basanite; 12-8 Ma) alkaline series in the flank of the Cheb-Domažlice Graben formed by the Teplá Highland and (iii) the young unimodal ol. melilitite/ol. nephelinite alkaline suite (2.0-0.12 Ma) at the intersection of the above mentioned structures in the Cheb Basin. The magmas of all the suites are mantle-derived and, in the case of the Cheb-Domažlice Graben series, associated with the AFC process. Two main fault systems: (i) ENE-WSW and (ii) NNW-SSE are developed in W Bohemia, corresponding to the directions of the two prominent taphrogenic structures. The southwesterly continuation of the Ohře Rift across the Mariánské Lázně Fault is marked by volcanics only.

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Authors and Affiliations

  1. Institute of Geology, Academy of Sciences of the Czech Republic, Czech Republic

    Jaromír Ulrych

  2. Institute of Geology, Academy of Sciences of the Czech Republic, Czech Republic

    Vladimír Cajz, Edvin Pivec & Jiří Karel Novák

  3. Czech Geological Survey, Czech Republic

    Čestmír Nekovařík

  4. Institute of Nuclear Research, Hungarian Academy of Sciences, Hungary

    Kadosa Balogh

Authors
  1. Jaromír Ulrych
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  2. Vladimír Cajz
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  3. Edvin Pivec
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  4. Jiří Karel Novák
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  5. Čestmír Nekovařík
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  6. Kadosa Balogh
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Ulrych, J., Cajz, V., Pivec, E. et al. Cenozoic Intraplate Alkaline Volcanism of Western Bohemia. Studia Geophysica et Geodaetica 44, 346–351 (2000). https://doi.org/10.1023/A:1022131413783

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