Vol.28, No.1 (E.S)

Geochemical characteristics of Quaternary sediments in the Hanoi area

Abstract. 17 samples collected from two drill holes (QO.01 and QO.03) at Quoc Oai (Hanoi) were analysed the main chemical compositions in oxides SiO2, TiO2, Al2O3, Fe2O3, MnO, MgO, CaO, Na2O, K2O by XRF method and some trace metal elements such as As, Cu, Pb, Zn, Sb, V, Cr, Ni, Cd by AAS method. According to these results, content of SiO2, Al2O3, Fe2O3 are the highest, the next is K2O, TiO2 and the other oxides are very low. The sediments in the Vinh Phuc formation have rich Fe2O3 by laterization, whereas those in the Hai Hung formation have rich K2O by the potassium-absorption in the organic matters. In the sediments, there are close relationship between the alkaline and alkaline earth elements, and the titan oxide is positively correlative with Al2O3 and Fe2O3..

Dang Mai1,*, Nguyen Thuy Duong1, Tong Thi Thu Ha2, Dang Quang Khang1, Nguyen Van Niem2, Dinh Xuan Thanh1

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