Correlation of bio- and magnetostratigraphy of Badenian sequences from western and northern Hungary

Abstract

Lithological, magnetostratigraphic and paleontological (nannoplankton, foraminifers, molluscs) studies were carried out on the Badenian successions of boreholes Sopron-89, Nagylózs-1 and Sáta-75 in Hungary. The correlations with the ATNTS2004 scale show that the Badenian sedimentation began during Chron C5Br thus the earliest Badenian deposits are missing in the sections. The first occurrence of Orbulina suturalis Brönnimann has been observed in Subchron C5Bn.1r, at 14.9 Ma. Although it is older than the interpolated age of 14.74 Ma in Chron C5ADr in the ATNTS2004, it is consistent with the age of 15.1 Ma obtained from recent calibration of planktonic foraminiferal bioevents. The base of the Bulimina-Bolivina Zone has been determined at 13.7 Ma in Chron C5ABr, and the Badenian/ Sarmatian boundary is recorded within Chron C5AAn, at 13.15 Ma.

Recostruction of the unusual Mid Miocene (Badenian) palaeoenvironment of the Carpathian Foredeep (Lomnice/Tišnov denudational relict, Czech Republic)

“…This could in di cate heterechroneity of this trans gres sion in a SW to NE di rec tion (?through tectonical in flu ences). Selmeczi et al (2012) supported this hy poth e sis when magnetostratigraphical re sults showed dif fer ent ages for the Mid dle Mio cene transgresion between west ern and east ern Hun gary.…”

“…In the Carpathian Foredeep it is con centrated in its south ern and cen tral part (Švábenická, 2002). Helicosphaera waltrans is lack ing in Po land (Oszczypko and Oszczypko-Clowes, 2012), east ern Hun gary (Selmeczi et al, 2012) and the north ern part of the Pannonian Ba sin in Slovakia and these transgressive de pos its should be youn ger than 14.37 Ma (LCO of H. waltrans). This could in di cate heterechroneity of this trans gres sion in a SW to NE di rec tion (?through tectonical in flu ences).…”

Timing of Langhian bioevents in the Carpathian Foredeep and northern Pannonian Basin in relation to oceanographic, tectonic and climatic processes

“…In other bas ins, world-ocean bioevent ages for cal i bra tion of detected magnetostratigraphical chrons were used. In the Pannonian Ba sin, it ap peared in the re verse chron cor re lated with C5Bn.1r Chron (15.03-14.87 Ma; Selmeczi et al, 2012). A sim i lar age is sug gested for the Al pine Foredeep Ba sin (AEoriae et al, 2004), while the spe cies' first oc cur rence in the Styrian Basin is dated to the nor mal Zone C5Bn.1n (14.87-14.78 Ma).…”

“…Orbulinas are the most widely dis trib uted in dex microfossils in this time in ter val, which oc cur in all Cen tral Paratethys bas ins (e.g., AEoriae et al, 2004AEoriae et al, , 2009Tomanová-Petrová and Švábenická, 2007;Spezzaferri et al, 2009;Selmeczi et al, 2012;de Leeuw et al, 2013;Peryt, 2013;Doláková et al, 2014;Holcová et al, 2015a, b;Gozhyk et al, 2015;Rybár et al, 2015). The FO of Orbulina rep re sents the base of the lo cal biozone of Praeorbulina-Orbulina suturalis (Cicha et al, 1975).…”

“…How ever, com ple men tary strati graphic data such as magnetostratigraphy (Hohenegger et al, 2009a;Selmeczi et al, 2012;de Leeuw et al, 2013) and new ra dio met ric and Sr-ages (Radócz, 2004;Han dler et al, 2006;de Leeuw et al, 2010;Fordinál et al, 2014) showed that the con cept of such a seem ingly dis tinct system no lon ger ap plies even for the lo cal stra tig ra phy (Hohenegger et al, 2014).…”