• Title of article

    Nitrogen isotope variations and environmental perturbations during CenomanianTuronian transition in the NE Tethyan realm, Koppeh-Dagh basin

  • Author/Authors

    Kalanat ، Behnaz - Ferdowsi University of Mashhad , Mahmudy Gharaie ، Mohammad Hosein - Ferdowsi University of Mashhad , Vahidinia ، Mohamad - Ferdowsi University of Mashhad , Vaziri-Moghaddam ، Hossein - University of Isfahan , Kano ، Akihiro - Tokyo University

  • Pages
    9
  • From page
    1
  • To page
    9
  • Abstract
    The Cenomanian-Turonian Gharesu section in the east of Koppeh-Dagh basin have been investigated to determine the relationship between palaeoenvironmental perturbations and nitrogen cycling across OAE2. This succession is composed of 43 m shale and marl interbedded with glauconitic sandstone and lies between Aitamir-Abderaz formations boundary. The nitrogen isotope values fluctuate between 0‰ to +3‰ and TOC/TN ratios range from 3.5 to 20.5 in this section. The TOC/TN exhibits high ratios in the organic-rich sediments which were deposited in a low-oxygen environment because nitrogen-rich organic matter was preferably degraded in this condition. The δ15N values are also low in the organic-rich sediments which indicate a nitrogen fixation process as a consequence of greenhouse climate, enhanced productivity and expanded oxygen minimum zone during OAE2.
  • Keywords
    Koppeh , Dagh Basin , Environmental Perturbations , Nitrogen Isotope , OAE2 , TOC , TN Ratio
  • Journal title
    Geopersia
  • Serial Year
    2017
  • Journal title
    Geopersia
  • Record number

    2448981

    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=10&DC=2448981