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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   STABLE ISOTOPE (δ13C AND δ 18O) AND CALCAREOUS NANNOPLANKTON RECORDS OF CRETACEOUS OCEANIC ANOXIC EVENTS: FIRST EVIDENCE IN THE SOUTHERN CARPATHIANS, ROMANIA.

Authors:  MIHAELA CARMEN MELINTE, ANA-VOICA BOJAR. 		 
       
         
  Abstract:  Over the last decades, the study of 13C and 18O isotopes was used to reveal Cretaceous Anoxic Oceanic Events. Such events were firstly described by Schlanger and Jenkyns (1976), being represented by sediments exceptionally rich in organic carbon (black shales). Several black shale sequences were proved coeval in different regions, indicating a widespread deposition of Corg-rich sediments during time-intervals named Oceanic Anoxic Events (OAEs). During the OAEs, several positive δ13C excursions occurred, related to the increased burial of organic carbon, caused by high productivity in the oceans and/or dysoxic to anoxic conditions in the deep and intermediate waters. Among the Cretaceous Anoxic Events, the Oceanic Anoxic Event 2 (OAE2 or Livello Bonarelli), placed within the Cenomanian/Turonian boundary interval, is one of the best studied and one of the longest in duration (Jarvis et al., 2006).  
         
     
         
         
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