Carbon isotope stratigraphy of Lochkovian to Eifelian limestones from the Devonian of central and southern Europe

Abstract

Lower to Middle Devonian carbonates of the Prague Syncline, the Carnic Alps, the Montagne Noire, and the Cantabrian Mountains were investigated for d 13 C carb and d 13 C org . These values were measured on bulk rocks, selected components and cements. Many carbonates exhibit primary marine values, but some are altered by diagenesis. A d 13 C curve can be presented for the latest Pridolian to Emsian time interval. Several sharp or broad positive excursions are obvious in the woschmidti-postwoschmidti, sulcatus, kitabicus, Late serotinus, and kockelianus conodont zones. The excursion at the SilurianDevonian boundary is known worldwide and therefore considered global in nature. Some of the others are described for the first time from central and southern Europe, and their global nature has to be verified by further investigations in other regions. Most excursions relate to and/or started during major regressions whereas sea-level highstands correspond to minimal d 13 C values. Similar relationships between sea-level changes and d 13 C have been observed from other early Palaeozoic intervals. The transgressive Choteč (?) and Kačµk events are marked by positive isotope excursions, this type of combination is usually observed in late Palaeozoic to Cenozoic black shale events.

Silurian-Devonian boundary events and their influence on cephalopod evolution: evolutionary significance of cephalopod egg size during mass extinctions

“…These sections (Bílá skála, Opatřilka, and Zadní Kopanina) are generally characterized by sedimentation in relatively shallow-water environments. The carbon isotope record of these sections has never been studied in contrast to the Klonk Section (GSSP) in the SW part of the Prague Basin (Hladíková et al 1997, Buggisch & Mann 2004) and the Požáry Quarry (GSSP) in the eastern part of the Prague Basin (Buggisch & Mann 2004). The sections discussed above were sampled in detail from the carbonate beds just below the Přídolian Monograptus bouceki Zone to the beginning of the Lochkovian Monograptus hercynicus Zone.…”

Stratigraphic correlation potential of magnetic susceptibility and gamma-ray spectrometric variations in calciturbiditic facies (Silurian-Devonian boundary, Prague Synclinorium, Czech Republic)

“…carbon and oxygen isotopes) described in numerous papers from the Silurian and Devonian of the Prague Synclinorium and other regions. Due to limited space we briefly refer for discussion to Hladíková et al (1997), Slavík et al (2000), Mann et al (2001), Saltzman (2002), Buggisch & Mann (2004), Buggisch & Joachimski (2006), Bábek et al (2007), and Malkowski et al (2009).…”

“…In many other sections Stratigraphic correlation potential of magnetic susceptibility and gamma-ray spectrometric variations in calciturbiditic facies (Silurian-Devonian boundary, Prague Synclinorium, Czech Republic) precise biostratigraphic data are incomplete to mostly absent. In several recent papers different stratigraphic approaches were applied, including magnetic susceptibility (MS) stratigraphy or chemostratigraphy (Hladíková et al 1997;Herten 2000;Kranendonck 2000;Mann et al 2001;Frýda et al 2002;Buggisch & Mann 2004). introduced the MS stratigraphic profile for the GSSP at Klonk and a drilling core situated close to the surface section.…”

Lower-Middle Devonian (upper Emsian-Eifelian, serotinus-kockelianus zones) conodont faunas from the Prague Basin, the Czech Republic

“…Třebotov and the base of the Choteč limestones are well exposed in this section. Relevant papers are: Chlupáč (1959), Klappper (1977), Klapper et al (1978), Chlupáč et al (1977), Chlupáč et al (1979), Chlupáč (1982Chlupáč ( , 1985, Buggisch & Mann (2004), Ellwood et al (2006) and Koptíková (accepted). The following conodont zones have been recognized: serotinus, patulus, partitus, costatus zones.…”

“…The Třebotov and Choteč limestones both crop out in this section. Relevant papers are: Chlupáč (1959), Svoboda & Prantl (1948), Buggisch & Mann (2004) and Koptíková (accepted). The following conodont zones were recognized (this study): serotinus, patulus, partitus, costatus, australis Zone (the last mentioned zone with a question mark).…”