Sequence Stratigraphy and Rudist Facies Development of the Upper Barremian‐Lower Cenomanian Platform,Northern Sinai,Egypt |
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| Authors: | Yasser SALAMA Michael GRAMMER Shaban SABER Soheir EL-SHAZLY and Gouda ABDEL-GAWAD |
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| Institution: | 1 Beni-Suef University, Faculty of Sciences, Geology Department, Egypt.
2 Boone Pickens School of Geology, Oklahoma State University, Stillwater, Oklahoma, United States.,2 Boone Pickens School of Geology, Oklahoma State University, Stillwater, Oklahoma, United States.,1 Beni-Suef University, Faculty of Sciences, Geology Department, Egypt.,1 Beni-Suef University, Faculty of Sciences, Geology Department, Egypt. and 1 Beni-Suef University, Faculty of Sciences, Geology Department, Egypt. |
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| Abstract: | The Lower Cretaceous sections in northern Sinai are composed of the Risan Aneiza (upper
Barremian-middle Albian) and the Halal (middle Albian-lower Cenomanian) formations. The facies
reflect subtle paleobathymetry from inner to outer ramp facies. The inner ramp facies are peritidal,
protected to open marine lagoons, shoals and rudist biostrome facies. The inner ramp facies grade
northward into outer ramp deposits. The upper Barremian-lower Cenomanian succession is subdivided
into nine depositional sequences correlated with those recognized in the neighbouring Tethyan areas.
These sequences are subdivided into 19 medium-scale sequences based on the facies evolution, the
recorded hardgrounds and flooding surfaces, interpreted as the result of eustatic sea level changes and
local tectonic activities of the early Syrian Arc rifting stage. Each sequence contains a lower
retrogradational parasequence set that constituted the transgressive systems tracts and an upper
progradational parasequence set that formed the highstand systems tracts. Nine rudist levels are
recorded in the upper Barremian through lower Cenomanian succession at Gabal Raghawi. At Gabal
Yelleg two rudist levels are found in the Albian. The rudist levels are associated with the highstand
systems tract deposits because of the suitability of the trophic conditions in the rudist-dominated ramp. |
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| Keywords: | Cretaceous sequence stratigraphy rudists Sinai Egypt |
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