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Geological Society, London, Special Publications; 2006; v. 262; p. 177-192;
DOI: 10.1144/GSL.SP.2006.262.01.11
© 2006 Geological Society of London

Transgressive-regressive facies cycles in late Cretaceous calciturbidites from the Mauretanian Series, Béni Ider thrust sheet, northwestern External Rif, Morocco: application of the ‘facies tract-facies sequence’ concept

Kh. El Kadiri1, K. El Kadiri2, A. Chalouan3, A. Bahmad4, F. Salhi5, H. Liemlahi1 & R. Hlila1

1 Université Abdelmalik Essaadi, Faculté des Sciences, BP 2121, Dêp. Géologie, M’Hannech II, 93003 Tetuan, Morocco khkadiri{at}fst.ac.ma
2 Université Abdelmalek Essaadi, Faculté des Sciences, BP 2121, Dép. Mathématiques, M’Hannech II, 93003 Tetuan, Morocco
3 Université Mohammed V-Agdal, Faculté des Sciences, Av. Ibn Batouta, BP 1014, Dép. Géologie, Agdal, 10000 Rabat, Morocco
4 Société Nationale d’Etudes du Détroit de Gibraltar (SNED), 31, r. Al Alaouyines, Rabat, Morocco
5 Université Chouaib Doukali, Faculté des Sciences, Dép. Géologie, El Jadida, Morocco

Late Cretaceous mixed carbonate-siliciclastic, thin-bedded turbidites occur between the two great sandstone packages of the Mauretanian Series (the Tisirène and the Béni Ider sandstone flyschs, of early Cretaceous and late Oligocene-early Burdigalian age, respectively). The application of the facies tract-facies sequence model allows subdivision of the studied calciturbidites into five distinct facies sequences (FS.1–5), which equal five transgressive-regressive facies cycles. These cycles mainly consist of thinning upward calciturbidites, which almost all start with coarse-grained carbonate breccias, and passing upward into a shale-dominated interval. Fe-stained discontinuities, together with sedimentological and ichnological evidence, lead us to assign these two lithological components to a transgressive and a regressive trend, respectively. This result provides new insights into the sequence-stratigraphic interpretation of turbiditic successions.





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Kh. El Kadiri, A. Chalouan, A. Bahmad, F. Salhi, and H. Liemlahi
'Transgressive washing' concept: a sequence stratigraphic approach for calci- and siliciclastic turbidites
Geological Society, London, Special Publications, 2006; 262: 45 - 53.
[Abstract] [PDF]