The transition from Jurassic to Cretaceous in northeast Tunisia: biostratigraphic details and distribution of facies
1989; Elsevier BV; Volume: 10; Issue: 2 Linguagem: Inglês
10.1016/0195-6671(89)90002-5
ISSN1095-998X
AutoresLucia Memmi, Pierre‐Yves Donzé, R. Combémorel, Gérard Le Hégarat,
Tópico(s)Geological and Geophysical Studies Worldwide
ResumoAt the end of the Jurassic the palaeogeography of northeast Tunisia was controlled by the presence of a series of positive areas aligned along the Zaress-Zaghouan axis which delimited two subsiding basins: the Tunisian Trough to the northwest and the Hammamet Trough to the northeast. These positive areas encouraged the development of reefs which, when traced laterally, are seen to be transitional to open marine facies. A biostratigraphy based on ammonite, calpionellid and ostracod distributions allows correlations between the different belts of facies. A la fin du Jurassique, la paléogéographie de la Tunisie nord-orientale est déterminée par la présence d'une série de hauts-fonds alignés selon un ‘axe Zaress-Zaghouan’ qui limite des bassins subsidents: le Sillon tunisien au Nord-Ouest et le Sillon de Hammamet au Nord-Est. Ces hauts-fonds ont favorisé l'installation de récifs alors que latéralement, on observe des séries de transition passant à des faciès marins ouverts. Une biostratigraphie établie à l'aide des ammonites, des calpionelles et des ostracodes a permis des corrélations entre ces différentes zones de faciès.
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