First evidence for the Cenomanian-Turonian oceanic anoxic event (OAE2, Bonarelli event) from the Ionian Zone, western continental Greece

Karakitsios, V; Tsikos, Harilaos; Van Breugel, Y; Koletti, L; Sinninghe Damsté, J S; Jenkyns, H C

Title: First evidence for the Cenomanian-Turonian oceanic anoxic event (OAE2, Bonarelli event) from the Ionian Zone, western continental Greece
Creator: Karakitsios, V
Creator: Tsikos, Harilaos
Creator: Van Breugel, Y
Creator: Koletti, L
Creator: Sinninghe Damsté, J S
Creator: Jenkyns, H C
Date Issued: 2007
Date: 2007
Type: Article
Identifier: vital:6735
Identifier: http://hdl.handle.net/10962/d1007547
Description: Integrated biostratigraphic (planktonic foraminifera, calcareous nannofossils), chemostratigraphic (bulk C and O isotopes) and compound-specific organic geochemical studies of a mid-Cretaceous pelagic carbonate—black shale succession of the Ionian Zone (western Greece), provide the first evidence for the Cenomanian–Turonian oceanic anoxic event (OAE2, ‘Bonarelli’ event) in mainland Greece. The event is manifested by the occurrence of a relatively thin (35 cm), yet exceptionally organic carbon-rich (44.5 wt% TOC), carbonate-free black shale, near the Cenomanian–Turonian boundary within the Vigla limestone formation (Berriasian–Turonian). Compared to the ‘Bonarelli’ black-shale interval from the type locality of OAE2 in Marche–Umbria, Italy, this black shale exhibits greatly reduced stratigraphic thickness, coupled with a considerable relative enrichment in TOC. Isotopically, enriched δ[superscript 13]C values for both bulk organic matter (−22.2‰) and specific organic compounds are up to 5‰ higher than those of underlying organic-rich strata of the Aptian-lower Albian Vigla Shale member, and thus compare very well with similar values of Cenomanian–Turonian black shale occurrences elsewhere. The relative predominance of bacterial hopanoids in the saturated, apolar lipid fraction of the OAE2 black shale of the Ionian Zone supports recent findings suggesting the abundance of N[subscript 2]-fixing cyanobacteria in Cretaceous oceans during the Cenomanian–Turonian and early Aptian oceanic anoxic events.
Format: 14 pages
Format: pdf
Language: English
Relation: Karakitsios, V. and Tsikos, Harilaos and Van Breugel, Y. and Koletti, L. and Sinninghe Damsté, J.S. and Jenkyns, H.C. (2007) First evidence for the Cenomanian–Turonian oceanic anoxic event (OAE2, ‘Bonarelli’ event) from the Ionian Zone, western continental Greece. International Journal of Earth Sciences, 96 (2). pp. 343-352. Available: http://dx.doi.org/10.1007/s00531-006-0096-4

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