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Geologica Carpathica

The Journal of Geological Institute of Slovak Academy of Sciences

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Volume 60, Issue 6

Issues

Late Miocene volcanic activity in the České středohoří Mountains (Ohře/Eger Graben, northern Bohemia)

Vladimír Cajz
  • Institute of Geology, Academy of Sciences of the Czech Republic, Rozvojová 269, 165 02 Prague, Czech Republic
  • Faculty of Science, J.E. Purkyně University, České mládeže 8, 400 96 Ústí nad Labem, Czech Republic
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Vladislav Rapprich
  • Czech Geological Survey, Klárov 3, 118 21 Prague, Czech Republic
  • Faculty of Science, Charles University in Prague, Albertov 6, 128 43 Prague, Czech Republic
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Vojtěch Erban / Zoltan Pécskay
  • Institute of Nuclear Research of the Hungarian Academy of Sciences, Bem tér 18/C, H-4001 Debrecen, Hungary
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Miroslav Radoň
Published Online: 2009-12-04 | DOI: https://doi.org/10.2478/v10096-009-0038-8

Late Miocene volcanic activity in the České středohoří Mountains (Ohře/Eger Graben, northern Bohemia)

First occurrences of superficial bodies of Late Miocene volcanic activity were found in the western part of the České středohoří Volcanic Complex (CSVC) and extended our knowledge of its volcanostratigraphy. Their K-Ar ages (9.59, 9.61 and 11.36 Ma) correspond to the age of alkaline basaltic rocks of the youngest known Intrusive Suite of this area. Unlike the previously known subvolcanic bodies of this system, the newly observed bodies are represented by superficial products: two scoria cones with remnants of lava flows and one exclusive lava flow produced from a lava cone. The magmas forming all three occurrences are basanitic. Their primitive chemical composition Sr (0.70347-0.70361) and Nd (0.51279-0.51284) isotope ratios are similar to the products of the first and third volcanic formation of the CSVC. The proved existence of superficial products of the youngest volcanic formation, together with clear superposition relations to sedimentary formations and the chemical character of the youngest magmas in the central part of the Ohře (Eger) Graben support the stratigraphic scheme of volcanic activity in the České středohoří Mts. The eruptive style of the youngest formation volcanoes was purely magmatic (Strombolian) with no phreatic influence.

Keywords: Upper Miocene; České středohoří; Štrbice Formation; volcanostratigraphy; geochemistry; K-Ar dating; cinder cone; basanite

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About the article


Published Online: 2009-12-04

Published in Print: 2009-12-01


Citation Information: Geologica Carpathica, Volume 60, Issue 6, Pages 519–533, ISSN (Online) 1336-8052, ISSN (Print) 1335-0552, DOI: https://doi.org/10.2478/v10096-009-0038-8.

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