Chronological implications of the paleomagnetic record of the Late Cenozoic volcanic activity along the Moravia-Silesia border (NE Bohemian Massif)

0382559 - GLÚ 2013 RIV SK eng J - Journal Article
Cajz, Vladimír - Schnabl, Petr - Pécskay, Z. - Skácelová, Z. - Venhodová, Daniela - Šlechta, Stanislav - Čížková, Kristýna
Chronological implications of the paleomagnetic record of the Late Cenozoic volcanic activity along the Moravia-Silesia border (NE Bohemian Massif).
Geologica Carpathica. Roč. 63, č. 5 (2012), s. 423-435. ISSN 1335-0552. E-ISSN 1336-8052
R&D Projects: GA AV ČR IAA300130612; GA ČR GAP210/10/2351
Institutional research plan: CEZ:AV0Z30130516
Institutional support: RVO:67985831
Keywords : Plio-Pleistocene basalts * paleomagnetism * magnetostratigraphy * volcanology * K/Ar dating, * airborne magnetometry and gravimetry * Moravia and Silesia
Subject RIV: DE - Earth Magnetism, Geodesy, Geography
Impact factor: 1.143, year: 2012
http://www.geologicacarpathica.sk/src/main.php

This paper presents the results of a paleomagnetic study carried out on Plio-Pleistocene Cenozoic basalts from the NE part of the Bohemian Massif. Paleomagnetic data were supplemented by 27 newly obtained K/Ar age determinations. Lavas and volcaniclastics of 6 volcanoes were sampled. Declination and Inclination values of paleomagnetic vector vary in the spans of 130 to 174 and -85 to -68° for reversed polarity (Pleistocene); or 345 to 350° and around 62° for normal polarity (Pliocene). Volcanological evaluation and compilation of older geophysical data from field survey served as the basis for the interpretation of these results. The Pleistocene volcanic stage consists of two volcanic phases, fairly closely spaced in time. Four volcanoes constitute the Bruntál Volcanic Field; two others are located 20 km to the E and 65 km to the NW, respectively. The volcanoes are defined as monogenetic ones, producing scoria cones and lavas. Exceptionally, the largest volcano shows a possibility of remobilization during the youngest volcanic phase, suggested by paleomagnetic properties. The oldest one (4.3–3.3 Ma), Břidličná Volcano, was simultaneously active with the Lutynia Volcano (Poland) which produced the Zálesí lava relic (normal polarity). Three other volcanoes of the volcanic field are younger and reversely polarized. The Velký Roudný Volcano was active during the Gelasian (2.6–2.1 Ma) and possibly could have been reactivated during the youngest (Calabrian, 1.8–1.1 Ma) phase which gave birth to the Venušina sopka and Uhlířský vrch volcanoes. The reliability of all available K-Ar data was evaluated using a multidisciplinary approach.
Permanent Link: http://hdl.handle.net/11104/0212750