Local catastrophe caused by tephra input near Přemyslovice (Moravia, Czech Republic) during the Middle Miocene

Abstract

Col o ni za tion by ma rine or gan isms such as foraminifers, molluscs, bryo zoans, brachi o pods and red al gae dur ing the Mid dle Mio cene (Early Badenian) trans gres sion near Pøemyslovice (Carpathian Foredeep) was ini tially af fected by a cool wa ter cur rent of un clear or i gin. How ever, shortly af ter wards, fall out of vol ca nic ma te rial caused a to tal ter mi na tion of the biota. Af ter this ca tas tro phe, the biota started recolonize the area. The suc ceed ing as so ci a tion, adopted to warm-wa ter in put, is char ac ter is tic of the cli ma tic op ti mum dur ing the Early Badenian and is com pa ra ble with those of other sec tions re ferred to this in ter val in the Carpathian Foredeep (such as Kralice nad Oslavou, Podbøežice, and Hluchov).Kamil Zágoršek, De part ment of Palae on tol ogy, Na tional Mu seum, Václavské námìstí 68,

Evolution of the passive margin of the peripheral foreland basin: an example from the Lower Miocene Carpathian Foredeep (Czech Republic)

“…Seismic and borehole data showed that the pre-Miocene basement of the studied area is formed by crystalline rocks of the Brunovistulicum, limestones of the Moravian-Silesian Paleozoic and occasional Carboniferous clastic deposits of Drahany Highland unit (Kalvoda et al 2003(Kalvoda et al , 2008Zágoršek et al 2012;Hladilová et al 2014). The basement generally dips southeastward, however the relief is very irregular.…”

“…The proposed article aims to improve our understanding of the paleogeography and evolution of the Carpathian Foredeep basin during the Karpatian (Lower Miocene) based on detailed sedimentological and sedimentary-petrographical studies using data from 16 deep boreholes and 31 cores. "Alternative" lithological, sedimentological and paleontological results from the Carpathian Foredeep forebulge depozone have been published (Cogan et al 1993;Hladilová et al 1999;Nehyba & Šikula 2007;Zágoršek et al 2012;Hladilová et al 2014;Holcová et al 2015). …”

The earliest Badenian Planostegina bloom deposit: reflection of an unusual environment in the westernmost Carpathian Foredeep (Czech Republic)

“…The base of the Neo gene suc ces sion is sit u ated at the depth of 21.5 m be low the sur face ac cord ing to ground-pen e trat ing ra dar data (Hubatka, 2012). The lithofacies of FA2 can be com pared to those of Lower Badenian out crops sur round ing Prostìjov (Zágoršek et al, 2012;Hladilová et al, 2014). Other sim i lar depositional en vi ron ments in the Moravian part of the Carpathian Foredeep have been de scribed in the Kralice, Kroužek, Podbøežice, Rousínov and Židlochovice ar eas (Nehyba et al, 2008;Zágoršek et al, 2009;Doláková et al, 2014;Holcová et al, 2015;Hrabovský et al, 2015).…”

“…About 200 bro ken dor sal valves and frag ments of var i ous sizes were found. This brachio pod has not pre vi ously been re ported from the Mio cene of the Czech Re pub lic (see Zágoršek et al, 2012;Bitner et al, 2013;Pavézková et al, 2013;Hladilová et al, 2014). The dom i nance of Discradisca makes the as sem blage from Brus unique among Paratethyan as sem blages.…”

“…The ba sin-fill con sists mainly of Lower Badenian de pos its with their max imum thick ness (>100 m) in the Prostìjov and Lutín de pressions, to the east of the pres ent study area (Kalabis, 1961;Novák, 1975;Jašková, 1998;Zapletal et al, 2001). Nu mer ous iso lated relicts of Neo gene de pos its in the Drahany High land rep re sent an ex ten sion of the Prostìjov De pres sion to wards the NW (Jašková, 1998;Zapletal et al, 2001;Zapletal, 2004, Zágoršek et al, 2012, Hladilová et al, 2014. The pre-Neo gene base ment is formed of Lower Car bon if er ous/Culmian rocks of the Drahany High land that over lie Pre cam brian crys tal line base ment (Mísaø et al, 1983).…”