Metodiev, L, Savov, IP, Grocke, D et al. (4 more authors) (2014) Palaeoenvironmental conditions recorded by 87Sr/86Sr, d13C and d18O in Late Pliensbachian-Toarcian (Jurassic) belemnites from Bulgaria. Palaeogeography, Palaeoclimatology, Palaeoecology, 409. 98 - 113. ISSN 0031-0182
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | Isotopes; belemnites; sedimentary; ammonite record; Lower Jurassic; Bulgaria |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 29 Jan 2015 16:19 |
Last Modified: | 04 May 2015 00:53 |
Published Version: | http://dx.doi.org/10.1016/j.palaeo.2014.04.025 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.palaeo.2014.04.025 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:82680 |