Cenozoic Intraplate Alkaline Volcanism of Western Bohemia

Authors: Ulrych J.¹; Cajz V.²; Pivec E.²; Novák J.K.²; Nekova rcaron ík C.³; Balogh K.⁴

Source: Studia Geophysica et Geodaetica, Volume 44, Number 2, April 2000 , pp. 346-351(6)

Publisher: Springer

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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 Ohe 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-Domalice 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-Domalice 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 Ohe Rift across the Mariánské Lázn Fault is marked by volcanics only.

Keywords: Western Bohemia; alkaline volcanism; Oh rcaron e Rift; Cheb-Doma zcaron lice Graben; tectonics

Language: English

Document Type: Research article

Affiliations: 1: Institute of Geology, Academy of Sciences of the Czech Republic, Czech Republic. ulrych@gli.cas.cz 2: Institute of Geology, Academy of Sciences of the Czech Republic, Czech Republic 3: Czech Geological Survey, Czech Republic 4: Institute of Nuclear Research, Hungarian Academy of Sciences, Hungary