Upper Cenozoic volcanic activity in Northern Moravia: reconstruction, paleomagnetism, geophysical image, proposal of litostratigrapgy

 

Vladimír Cajz, Zuzana Skácelová, Petr Schnabl, Miroslav Radoň

Geoscience Research Reports 46, 2013 (GRR for 2012), pages 20–25

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Abstract

Young Cenozoic volcanic activity of the Bruntál Volcanic Field is described based on new investigation. Litostratigraphy, supported by magnetostratigraphy, is proposed in two Formations, the younger one is divided into two Beds. The stratotypes are defined. The Pliocene Břidličná Fm. (Zanclean to Piacenzian; 4.3-3.3 Ma; normal polarity)-activity of Břidličná and Lutynia (Poland) volcanoes; scoriae and lavas. The Pleistocene Bruntál Fm. consists of the Roudný Bds. (Gelasian; 2.6-2.1 Ma; reversed polarity) and the Venus Bds. (Calabrian; 1.8-1.1 Ma, reversed polarity). Roudný Beds - strombolian activity of the Velký Roudný Hill volcano producing scoriae and lavas, and sedimentation of the Razová tuffites in lava-dam lake. Venuše (Venus) Beds - strombolian eruption of the Uhlířský vrch Hill volcano, phreato-strombolian to strombolian eruption of the Venušina sopka volcano, both producing pyroclastics and lavas, and deposition of possible pyroclastic flow/surge into the Razová Tuffite Complex at Karlovec.