Geochemical Evidence for Photic Zone Euxinia During Greenhouse Climate in the Tethys Sea, Egypt

Douaa Fathy, Michael Wagreich, Mabrouk Sami

Research output: Chapter in Book/Report/Conference proceedingConference contribution

20 Citations (Scopus)

Abstract

Upper cretaceous organic-rich sediments are good archives for the paleoceanographic changes. Here, a comprehensive set of geochemical, biological, and mineralogical data have been applied in order to evaluate the role of euxinia on the organic matter during deposition. The total organic matter of these organic-rich sediments reaches up to 23 wt%. They have significant concentrations of redox-sensitive trace elements such as Mo, Cu, Zn, Ni, Cd, U, and V. The values of redox proxies (e.g., U/Mo, V/(V + Ni), V/Ni, Ni/Co, V/Cr, U/Th, U authigenic) and the size of framboids pyrite suggest that the Upper Cretaceous organic-rich sediments were deposited under a euxinic water column environment. The molecular fossils data also point to the predominance of the sulfidic anoxic conditions during deposition. The good correlation between TOC and redox proxies indicates that the oxygen-depleted conditions play a significant role in the preservation of that organic matter.

Original languageEnglish
Title of host publicationAdvances in Geophysics, Tectonics and Petroleum Geosciences - Proceedings of the 2nd Springer Conference of the Arabian Journal of Geosciences CAJG-2, Tunisia 2019
EditorsMustapha Meghraoui, Narasimman Sundararajan, Santanu Banerjee, Klaus-G. Hinzen, Mehdi Eshagh, François Roure, Helder I. Chaminé, Said Maouche, André Michard
PublisherSpringer Nature
Pages373-374
Number of pages2
ISBN (Print)9783030730253
DOIs
Publication statusPublished - 2022
Externally publishedYes
Event2nd Springer Conference of the Arabian Journal of Geosciences, CAJG-2 2019 - Sousse, Tunisia
Duration: Nov 25 2019Nov 28 2019

Publication series

NameAdvances in Science, Technology and Innovation
ISSN (Print)2522-8714
ISSN (Electronic)2522-8722

Conference

Conference2nd Springer Conference of the Arabian Journal of Geosciences, CAJG-2 2019
Country/TerritoryTunisia
CitySousse
Period11/25/1911/28/19

Keywords

  • Cretaceous
  • Depositional environment
  • Egypt
  • Euxinia
  • Greenhouse climate
  • Organic matter

ASJC Scopus subject areas

  • Architecture
  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment

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