Abstract:
The Maastrichtian carbonate environments occur in Northern Libya among the structural units of the Ghadames Basin, the Sirte Basin, the Cyrenaica Platform and the Jabal Al Akhdar. In the off shore Pelagian Shelf, these environments are also present where the Tunisian stratigraphic terminology is in practice. The Maastrichtian carbonate environments of the Sirte Basin are distinguished into shallow-water ine facies containing age-diagnostic benthonic foraminiferal species, Orbitoides apiculatus, Omphalocyclus macroporus and Siderolites calcitrapoides and an outer neritic facies characterised by globotruncanids, heterohelicids and some benthonic smaller foraminifera. The Globoruncana gansseri Zone is the most prominent in planktonic biostraligraphy whereas a single benthonic foraminiferal Bolivina incrassata gigantea Zone is present. In Ghadames Basin, outer neritic facies is succeeded by shallow-water facies analogous to the biofacies of the Sirte Basin. Other regions demonstrate single type of environment, either shallow shelf deposition in the Cyrenaica Platform, or an outer neritic facies in the Jabal Al Akhdar and in the offshore region where planktonic biostratigraphy can be used.
Page(s):
13-25
DOI:
DOI not available
Published:
Journal: Geological Bulletin of the Punjab University, Volume: 23, Issue: , Year: 1987