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Cenomanian–Turonian transition in a shallow water sequence of the Sinai, Egypt

Gertsch, B.; Keller, Gerta; Adatte, Thierry; Berner, Zsolt; Kassab, A.S.; Tantawy, A.A.; El-Sabbagh, A.M.; Stüben, Doris

Abstract:
Environmental and depositional changes across the Late Cenomanian oceanic anoxic event (OAE2) in the Sinai, Egypt, are examined based on biostratigraphy, mineralogy, δ13C 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 δ13C excursion is likely due to a rising sea-level. Characteristic OAE2 anoxic conditions reached this coastal region only at the end of the δ13C plateau in deeper waters near the end of the Cenomanian. Increased phosphorus accumulations before and after the δ13C 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 δ13C peak. ... mehr


Volltext §
DOI: 10.5445/IR/1000009946
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mineralogie und Geochemie (IMG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2008
Sprache Englisch
Identifikator ISSN: 1437-3254
urn:nbn:de:swb:90-99463
KITopen-ID: 1000009946
Erschienen in International Journal of Earth Sciences
Verlag Springer Verlag
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