Paleomagnetism and integrated stratigraphy of the Upper Berriasian hemipelagic succession in the Barlya section Western Balkan, Bulgaria: Implications for lithogenic input and paleoredox variations

0464293 - GLÚ 2017 RIV NL eng J - Článek v odborném periodiku
Grabowski, J. - Lakova, I. - Petrova, S. - Stoykova, K. - Ivanova, D. - Wójcik-Tabol, P. - Sobien, K. - Schnabl, Petr
Paleomagnetism and integrated stratigraphy of the Upper Berriasian hemipelagic succession in the Barlya section Western Balkan, Bulgaria: Implications for lithogenic input and paleoredox variations.
Palaeogeography, Palaeoclimatology, Palaeoecology. Roč. 461, 1 November (2016), s. 156-177. ISSN 0031-0182. E-ISSN 1872-616X
Grant CEP: GA ČR(CZ) GA16-09979S
Institucionální podpora: RVO:67985831
Klíčová slova: biostratigraphy * carbon isotope stratigraphy * climate * magnetic susceptibility * magnetostratigraphy * sea-level changes
Kód oboru RIV: DE - Zemský magnetismus, geodézie, geografie
Impakt faktor: 2.578, rok: 2016

A continuous Late Berriasian sedimentary and stratigraphic record is presented from a hemipelagic succession from the Barlya section. The section, 39-m-thick, was stratigraphically calibrated using biostratigraphy, magnetostratigraphy and carbon isotope stratigraphy. Additionally, chemostratigraphy and rock magnetic stratigraphy were applied in order to identify major paleoenvironmental changes: lithogenic input and paleoredox variations. Polarity zones from M17r to M14r were identified from the uppermost Lower Berriasian up to the Berriasian/Valanginian boundary (Elliptica to Darderi calpionellid subzones and NK-1 to NK-3 nannofossil zones). Late Berriasian calcareous dinocyst zones of Stomiosphaerina proxima, Stomiosphaera wanneri and Colomisphaera conferta were correlated with magnetostratigraphy for the first time. A carbon isotope profile correlates very well with the δ13C records from SE France and the Western Atlantic, documenting some well-resolved minima and maxima in a generally decreasing trend. Magnetic susceptibility (MS) reveals a positive correlation with lithogenic elements (e.g., Al, Ti, Zr, Th) and is regarded as a reliable proxy of detrital input. Influx of terrigenous material increases in the Upper Berriasian up to the Berriasian/Valanginian boundary. A prominent MS increase takes place in the lowermost part of polarity zone M16n (close to the Simplex/Oblonga boundary). The MS event can be traced in the Central Carpathian, Apennine and SE France sections, exactly in the same stratigraphic position. It is coeval with an important climatic turnover in Western Tethys; however, it might have been strengthened by a general regression and tectonic events in the Carpatho–Balkan area. Two oxygen deficient intervals were documented: i) in the Lower Berriasian (M17r to M16r); ii) in the uppermost Upper Berriasian up to the boundary with Valanginian (M15r to M14r). Both intervals correlate with an elevated sea-level in the Western Tethys.
Trvalý link: http://hdl.handle.net/11104/0263230