The outlet of Mejerda River, situated in the North of Tunisia, receives large volumes of mining rejects mainly from Pb, Zn and Ba mines during last decades. Concentration of major and trace elements (Al, Ti, P, K, Mg, Na, Ca, S, Fe, Cl, V, Cr, Co, Ni, Cu, Zn, Ga, Br, Rb, Sr, Y, Zr, Nb, I, Ba and Pb) are determined in different three fractions of 45 surficial sediments. Grain size distribution of fine fractions (<2 urn, 2-20 urn, 20-63 Mm) reveals that clay and fine silt fraction are dominant 75-95% in the deeper estuarine region. Regarding clays, the dominant phases are dioctahedral smectite, illite and kaolinite. Chlorite and interstratified illite-smectite are also present.
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