Beitrag
Integrated stratigraphy of the Valanginian Carbon-Isotope-Excursion (Weissert event) from the Kryta Valley section, Western Carpathians (Poland): correlation with the Vocontian Basin and palaeoenvironmental implications
Grabowski, J.; Pszczółkowski, A.; Stoykova, K.; Martinez, M.; Iwańczuk, J.; Krzemiński, L.; Sidorczuk, M.
Newsletters on Stratigraphy Volume 58 Number 1 (2025), p. 1 - 46
161 Literaturangaben
veröffentlicht: Mar 20, 2025
Online veröffentlicht: Nov 14, 2024
Manuskript akzeptiert: Jul 26, 2024
finale Ms. Revision erhalten: Jul 22, 2024
Manuskript-Revision angefordert: Jul 3, 2024
Manuskript erhalten: Apr 23, 2024
ArtNo. ESP026005801001, Preis: 29.00 €
Abstract
Uppermost Berriasian – upper Hauterivian stratigraphical data from the Kryta Valley section (Tatra Mts, Fatric unit, Western Carpathians, Poland) are presented and discussed against the Early Cretaceous chronostratigraphic framework for the Vocontian Basin (SE France). The hemipelagic marly-carbonate succession of the Kryta Valley section, 128 m thick, was calibrated using biostratigraphy (calpionellids, calcareous dinocysts, calcareous nannofossils), and stable isotope stratigraphy (δ13Ccarb and δ18Ocarb). The NK2 (upper Berriasian/lowermost Valanginian) to NC5B (upper Hauterivian) calcareous nannofossil (sub)zones were documented. Magnetic stratigraphy and high-resolution orbital stratigraphy were applied in the lower 36.6 m of the section (upper Berriasian–lower Valanginian: uppermost M16n–M13r). The Berriasian/Valanginian boundary (base of the Calpionellites Zone) was identified in magnetozone M14r. The position of the lower/upper Valangianian, Valanginian/Hauterivian and lower/upper Hauterivian boundaries were estimated through correlation with calcareous nannofossil zones and the δ13Ccarb synthetic curve from the Vocontian Basin. The identification of orbital cycles within the Berriasian/Valanginian boundary interval enabled a detailed correlation with the Vergol section (GSSP candidate for the base of the Valanginian). The sedimentation rate in the Kryta Valley section amounts to 9–18 m/Ma. The approximate duration of magnetochrons M15r–M14n from the orbital cycles, as well as the position of calcareous dinocyst zonation against the δ13Ccarb curve are reported here for the first time. Sedimentation of the turbiditic sandstones with Cr-spinels (Kryta/Oravice Mb.) falls in magnetozone M13r, in the boundary interval between the Calpionellites and Tintinnopsella Zones, still in the lower Valanginian. The deposition of this turbiditic member occurred during a lowstand interval, implying that it was triggered by a decreasing sea-level, possibly orbitally controlled.
Schlagworte
Weissert CIE • calcareous nannofossils • calpionellids • magnetic stratigraphy • astrochronology • Western Carpathians