Recurrent Cenozoic volcanic activity in the Bohemian Massif (Czech Republic)

0358374 - GLÚ 2012 RIV NL eng J - Journal Article
Ulrych, Jaromír - Dostal, J. - Adamovič, Jiří - Jelínek, E. - Špaček, Petr - Hegner, E. - Balogh, K.
Recurrent Cenozoic volcanic activity in the Bohemian Massif (Czech Republic).
Lithos. Roč. 123, 1/4 (2011), s. 133-144. ISSN 0024-4937. E-ISSN 1872-6143
R&D Projects: GA AV ČR(CZ) IAA300130902; GA ČR(CZ) GA205/09/1170
Institutional research plan: CEZ:AV0Z30130516; CEZ:AV0Z30120515
Keywords : Bohemian Massif * Cenozoic * alkaline volcanism * paleostress fields * rift * mantle
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 3.246, year: 2011

Cenozoic anorogenic volcanism of the Bohemian Massif is an integral part of the Central European Volcanic Province. Three main volcanic periods can be distinguished based on K-Ar data and known paleostress fields: (i) pre-rift (79–49 Ma), (ii) syn-rift (42–16 Ma) and (iii) late-rift (16–0.3 Ma), with the youngest period further subdivided into three episodes. The dominant mafic rock types of all periods are of nephelinite – basanite / tephrite composition. The exceptions are suites of ultramafic rocks of the pre-rift period and of the final episode of the late-rift period. The most voluminous are volcanic rocks of the syn-rift period occurring in the Ohře Rift Graben. The initial Sr-Nd ratios of the mafic volcanic rocks of the Bohemian Massif are characteristic of magmas derived from a sub-lithospheric mantle source. The isotopic ratios resemble those of the HIMU mantle source.
Permanent Link: http://hdl.handle.net/11104/0196439