Titre
Cenomanian-Turonian transition in a shallow water sequence of the Sinai, Egypt
Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
Auteur(s)
Gertsch, B.
Auteure/Auteur
Keller, G.
Auteure/Auteur
Adatte, T.
Auteure/Auteur
Berner, Z.
Auteure/Auteur
Kassab, A. S.
Auteure/Auteur
Tantawy, A.A.
Auteure/Auteur
El Sabbagh, A.M.
Auteure/Auteur
Stueben, D.
Auteure/Auteur
Liens vers les personnes
Liens vers les unités
ISSN
1437-3254
Statut éditorial
Publié
Date de publication
2010
Volume
99
Première page
165
Dernière page/numéro d’article
182
Peer-reviewed
Oui
Langue
anglais
Résumé
Environmental and depositional changes across the Late Cenomanian
oceanic anoxic event (OAE2) in the Sinai, Egypt, are examined based on
biostratigraphy, mineralogy, delta(13)C values and phosphorus analyses.
Comparison with the Pueblo, Colorado, stratotype section reveals the
Whadi El Ghaib section as stratigraphically complete across the late
Cenomanian-early Turonian. Foraminifera are dominated by high-stress
planktic and benthic assemblages characterized by low diversity,
low-oxygen and low-salinity tolerant species, which mark shallow-water
oceanic dysoxic conditions during OAE2. Oyster biostromes suggest
deposition occurred in less than 50 m depths in low-oxygen, brackish,
and nutrient-rich waters. Their demise prior to the peak delta(13)C
excursion is likely due to a rising sea-level. Characteristic OAE2
anoxic conditions reached this coastal region only at the end of the
delta(13)C plateau in deeper waters near the end of the Cenomanian.
Increased phosphorus accumulations before and after the delta(13)C
excursion suggest higher oxic conditions and increased detrital input.
Bulk-rock and clay mineralogy indicate humid climate conditions,
increased continental runoff and a rising sea up to the first delta(13)C
peak. Above this interval, a dryer and seasonally well-contrasted
climate with intermittently dry conditions prevailed. These results
reveal the globally synchronous delta(13)C shift, but delayed effects of
OAE2 dependent on water depth.
oceanic anoxic event (OAE2) in the Sinai, Egypt, are examined based on
biostratigraphy, mineralogy, delta(13)C values and phosphorus analyses.
Comparison with the Pueblo, Colorado, stratotype section reveals the
Whadi El Ghaib section as stratigraphically complete across the late
Cenomanian-early Turonian. Foraminifera are dominated by high-stress
planktic and benthic assemblages characterized by low diversity,
low-oxygen and low-salinity tolerant species, which mark shallow-water
oceanic dysoxic conditions during OAE2. Oyster biostromes suggest
deposition occurred in less than 50 m depths in low-oxygen, brackish,
and nutrient-rich waters. Their demise prior to the peak delta(13)C
excursion is likely due to a rising sea-level. Characteristic OAE2
anoxic conditions reached this coastal region only at the end of the
delta(13)C plateau in deeper waters near the end of the Cenomanian.
Increased phosphorus accumulations before and after the delta(13)C
excursion suggest higher oxic conditions and increased detrital input.
Bulk-rock and clay mineralogy indicate humid climate conditions,
increased continental runoff and a rising sea up to the first delta(13)C
peak. Above this interval, a dryer and seasonally well-contrasted
climate with intermittently dry conditions prevailed. These results
reveal the globally synchronous delta(13)C shift, but delayed effects of
OAE2 dependent on water depth.
PID Serval
serval:BIB_FAE4B070A9CB
Date de création
2012-09-28T09:03:20.836Z
Date de création dans IRIS
2025-05-21T07:05:35Z