Petrology of the oldest polymict conglomerate at the eastern margin of the Rhenohercynian Zone: evidence for initial rifting of the Brunovistulian terrane in Moravia

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Authors	KRMÍČEK Lukáš PŘICHYSTAL Antonín
Year of publication	2007
Type	Article in Proceedings
Conference	CzechTec07 - 5th Meeting of the Central European Tectonic Studies Group and 12th Meeting of the Czech tectonic Studies Group, April 11-14, 2007, Teplá, Czech Republic
MU Faculty or unit	Faculty of Science
Citation
Field	Geology and mineralogy
Keywords	Bohemian Massif; Moravo-Silesian Devonian; Hády conglomerate; granite pebbles; tetrad effect
Description	Middle Devonian coarse-grained (exotic) polymict conglomerate near Brno (called the Hády conglomerate) has been investigated to determine the provenance area. The results of morphometric, petrographic and geochemical study suggests that pebbles belong to eroded upper levels of the Brno Massif and its crystalline envelope. Sedimentation of polymict conglomerate has been accompanied by explosive rhyolitic volcanism with A-type affinity. The Hády conglomerate represents alluvial sediment which was deposited into a continental extension basin. This can be connected very probably with initial phase of the Brunovistulian rifting. The western part of the Brno Massif had to be intensively eroded in the time of the Hády conglomerate formation.
Related projects:	Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)