ABSTRACT
The Bouguer map of the Sirt basin is characterized by well differentiated positive and negative gravity anomalies, generally striking N to NW. Positive anomalies represent uplifted basement rocks with a relatively thin sedimentary cover, negative ones are related to a deep-seated basement with relatively thick overlying sedimentary sequences. The palaeogeographic development and the differentiation of the Sirt basin into major troughs and uplifts is demonstrated on the basis of isopach maps for the Upper Cretaceous and Eocene. The different rates of sedimentation and the different types of sediments between uplifts and troughs prove the syngenetic character of the mapped structural units.
