eprintid: 8432
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/84/32
datestamp: 2023-11-09 16:20:20
lastmod: 2023-11-09 16:20:20
status_changed: 2023-11-09 16:12:38
type: article
metadata_visibility: show
creators_name: Baioumy, H.
creators_name: Lehmann, B.
title: Anomalous enrichment of redox-sensitive trace elements in the marine black shales from the Duwi Formation, Egypt: Evidence for the late Cretaceous Tethys anoxia
ispublished: pub
keywords: anoxia; black shale; Cretaceous; depositional environment; redox conditions; remineralization; Tethys; trace element, Egypt
note: cited By 32
abstract: Marine black shale beds in the Duwi Formation of NE Egypt are part of the Late Cretaceous-Palaeogene Middle East-North African phosphogenic province. These black shales were analyzed for their redox-sensitive trace elements (V, Ni, Mo, U, Cu, Cr, Re, Cd, Sb, Tl, and Mn) to examine their depositional conditions. The data show that the black shales have elevated concentrations of redox-sensitive trace metals, low Mn contents, low Th/U and V/Mo ratios, and high V/Ni, Ni/Co, V/(V + Ni) and V/(V + Cr) ratios as well as a positive correlation of metal Mo to V concentrations. These geochemical data suggest that the Campanian-Maastrichtian Tethys was stratified and stagnant, with reducing bottom water conditions. The high V/Ni ratios in the study shales indicate their dominantly marine origin and suggest that the high-productivity upwelling system that persisted over �20 m.y. at the southern margins of the Tethys Ocean is the main source of the organic matter. A combination of elevated primary productivity, remineralization and reducing depositional conditions is the main control of enrichment of redox-sensitive trace elements in the black shales of the Duwi Formation. © 2017
date: 2017
publisher: Elsevier Ltd
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85019167790&doi=10.1016%2fj.jafrearsci.2017.05.006&partnerID=40&md5=4dab24e11d8c5b87ce2969bf7e982c78
id_number: 10.1016/j.jafrearsci.2017.05.006
full_text_status: none
publication: Journal of African Earth Sciences
volume: 133
pagerange: 7-14
refereed: TRUE
issn: 1464343X
citation:   Baioumy, H. and Lehmann, B.  (2017) Anomalous enrichment of redox-sensitive trace elements in the marine black shales from the Duwi Formation, Egypt: Evidence for the late Cretaceous Tethys anoxia.  Journal of African Earth Sciences, 133.  pp. 7-14.  ISSN 1464343X