Mode of Formation of the Coastal Sabkha Sediments in the Coastal Plain of Al-Dafna Plateau


  • Ahmed Mohammed Geology Department, Science Faculty, Tobruk University, Tobruk, Libya.



Intertidal and supratidal sabkhas, coastal sand dune, mouth of wadis, Al-Dafna plateau.


Two types of sabkhas are distinguished in the study of coastal area; the first type was developed at the mouths of wadis where sea water enters the wadis through high tides; these include; Omm El-Shawesh, Wadi Al-Ain sabkha and Wadi Rizk sabkha. A generalized hydrodynamic model for the formation of this type of sabkha was constructed. The second type of sabkha is stretching behind the dunes, and is divided into a longitudinal strip from east to west where saline crusts appear in some parts and approach the groundwater level. These sabkhas are subjected to flooding during the winter and plant grows within this sabkha. Behind the shore sand hummocks, sea water enters the sabkhas area by seepage and mix with groundwater, and then rises upward to the surface through capillary action and evaporats. This type of sabkha include; Alaqila, Omm Rukbah and Wadi Al-Sawani. The generalized hydrodynamic model suggested for the formation of this kind of sabkha was constructed too.


Al-Harram, F. (1997). The Libyan Coast. Publications of the Center for Research and Consultations, University of Garyounis, Benghazi, First Edition. (Translated From Arabic).

Ashour, M. (1991). The sabkhas in the Peninsula of Qatar: Biogeological and Geomorphology Study, Center for Documentation and Humanities, Qatar University, First Edition. (Translated From Arabic).

Ali, Y. A. (1981). Mineralogical, geochemical and Sedimentological studies on recent sabkha sediments west of Alexandria, Egypt, and some Upper Jurassic evaporites from Dorset, England (Unpublished Ph.D. Thesis, Faculty of Science, Ain Shams University, Cairo, 332 pp.

Ali, Y. A., and West, I. (1983). Relationships of modern gypsum nodules in sabkhas of loess to compositions of brines and sediments in northern Egypt. Journal of Sedimentary Research, 53 (4), 1151-1168.

Boggs, S. (1987). Principal of Sedimentology and Stratigraphy. Macmillan Publishing Company, New York, 519 pp.

El Deftar, T., and Issawi, B. (1977). Geological Map of Libya, 1: 250 000, Sheet Al Bardia NH 35-1. In Explanatory Booklet (p. 93). Ind. Res. Centre Tripoli, Libya.

Kleo, A. A., and Al‐ Otaibi, O. (2011). The sustainable development of Kuwaiti Sabkhas. Digest of Middle East Studies, 20 (1), 27-49.

Kinsman, D. J. (1969). Modes of formation, sedimentary associations, and diagnostic features of shallow-water and supratidal evaporites. Bull. Am. Ass. Petrel. Geol. Vole 53 (4), p. 830-840.

Mazhar, A., and Issawi, B. (1977). Geological map of Libya: 1: 250,000 sheet, Zt. Msus NH34-3, Explanatory Booklet, Indust. Res. Cent., Tripoli, 80p.

Mohamed, A. (1993). Depositional environments of some Miocene rocks in northern Western Desert, Egypt. Unpublished M.Sc. Thesis, Alexandria Univ., Egypt, 144 pp.

Prudêncio, M. I., Gonzalez, M. I., Dias, M. I., Galan, E., and Ruiz, F. (2007). Geochemistry of sediments from El Melah lagoon (NE Tunisia): a contribution for the evaluation of anthropogenic inputs. Journal of Arid Environments, 69 (2), 285-298.

Sweedan, A. and Issawi, B. (1977). Geological map of Libya, 1: 250,000 Sheet NH 34-4 Bir Hacheim. Explanatory Booklet, Industrial Research Center, Tripoli, 80p.

Saleh, M. (2013). Al-Dafna Plateau, Northeast of Tobruk, Libya: Geomorphological Study. Unpublished Ph.D. Thesis in Natural Geography, Faculty of Arts, Ain Shams University, Egypt. 338 pp. (Translated From Arabic).




How to Cite

Mohammed, A. (2022). Mode of Formation of the Coastal Sabkha Sediments in the Coastal Plain of Al-Dafna Plateau. Scientific Journal for Faculty of Science-Sirte University, 2(2), 33–37.