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Paleoenvironmental conditions recorded by 87Sr/86Sr, δ13C and δ18O in late Pliensbachian–Toarcian (Jurassic) belemnites from Bulgaria

Metodiev, L.S.; Savov, I.P.; Gröcke, D.R.; Wignall, P.B.; Newton, R.J.; Andreeva, P.V.; Koleva-Rekalova, E.K.

Authors

L.S. Metodiev

I.P. Savov

P.B. Wignall

R.J. Newton

P.V. Andreeva

E.K. Koleva-Rekalova



Abstract

The late Pliensbachian–Toarcian (Jurassic) sedimentological, paleontological and geochemical (belemnite 87Sr/86Sr, δ13C and δ18O) record is examined in two Eastern Tethyan (Bulgarian) locations. This interval contains the well-known early Toarcian ocean anoxic event (T-OAE) and its manifestation and temporal context is examined in Bulgaria. Many of the features seen in south-western Europe are identified: collapse of carbonate platform productivity at the Pliensbachian/Toarcian boundary, the T-OAE (a short pulse of euxinic deposition in the Falciferum Zone), an early Toarcian rapid warming event seen in the belemnite δ18O record that peaked around the Falciferum/Bifrons Zone boundary. The long-recognized positive δ13C excursion in the late Falciferum Zone is also seen but a precursor, sharp δ13C negative excursion seen around the Tenuicostatum/Falciferum Zone boundary in most organic carbon records is not seen in the belemnite data, a curious absence noted from other belemnite records. Subsequent perturbations in 87Sr/86Sr, δ13C and δ18O suggest that there may be more global isotopic excursions in the Early Jurassic. On the other hand, belemnite Sr isotope values from Bulgaria are in accord with those recorded in Western Europe and hence, demonstrating its value as a chronostratigraphic tool.

Citation

Metodiev, L., Savov, I., Gröcke, D., Wignall, P., Newton, R., Andreeva, P., & Koleva-Rekalova, E. (2014). Paleoenvironmental conditions recorded by 87Sr/86Sr, δ13C and δ18O in late Pliensbachian–Toarcian (Jurassic) belemnites from Bulgaria. Palaeogeography, Palaeoclimatology, Palaeoecology, 409, 98-113. https://doi.org/10.1016/j.palaeo.2014.04.025

Journal Article Type Article
Acceptance Date Apr 30, 2014
Online Publication Date May 9, 2014
Publication Date 2014-09
Deposit Date May 19, 2015
Journal Palaeogeography, Palaeoclimatology, Palaeoecology
Print ISSN 0031-0182
Electronic ISSN 1872-616X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 409
Pages 98-113
DOI https://doi.org/10.1016/j.palaeo.2014.04.025
Public URL https://durham-repository.worktribe.com/output/1428508