LATE CRETACEOUS - LOWER EOCENE CARBONATE
ROCKS, CEBEL LIBNI, NORTHERN SINAI, EGYPT:
PETROGRAPHY AND GEOCHEMISTRY
ATEF M. IBRAHIM and 1SAMIR S. ELMILAHI
Geology Dept., Fac. Sciences, ElAzhar Univ. Cairo, Egypt, 1North Sinai Governorate, Egypt
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The stratigraphic sequence in G. Libni area is divided into four Formations: Halal (Cenomanion - Turonian), Sudr (Campanian - Maastrichtian), Esna Shale (Paleocene), and Thebes Fms (Lower Eocene).
The petrographic study of 62 Late Cretaceous - Lower Eocene carbonate samples reveal that they are characterized by uniform (restricted platform) depositional patterns of shallow waters with a prevailing lime muddy sediments. Diagenetically, the carbonate rocks were subjected to submarine and subaerial environments.
Chemical analysis or 19 selected samples shows the distribution of both major and trace elements. The physiochemical parameters of the depositional environment during Late Cretaceous - Lower Eocene times indicate its shallow marine warm conditions.
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