关键词: 伊犁盆地；黄土和古土壤；元素地球化学；化学风化；影响因素

Abstract:

The element distribution characteristics and chemical weathering intensity of the loess and paleosol at the Zhaosu
section in the Ili Basin are preliminarily studied through element geochemical analysis. Through comparing with the type
Luochuan loess-palesol section of the Quaternary aeolian deposit in the Loess Plateau, we draw the following conclusions. The
contents of major elements in the loess and paleosol at the Zhaosu section in the Ili region show similar variations，which indicate that both of them experienced the similar degree of chemical weathering after deposition. Major elements have the same changing trend as that of the Loess Plateau, with enriched CaO and MgO and depleted Na2O and P2O5. CIA index, Na/K ratio and A-CN-K diagrams all indicate that the Ili loess and paleosol experienced weaker chemical weathering than that in the Loess Plateau. Furthermore, there is no obvious chemical weathering differentiation between loess and paleosol. The climate conditions such as hydro-thermal combination (precipitation, temperature and evaporation, etc.) may play an important role in chemical weathering of loess and paleosol in the Ili basin.

Key words: Ili Basin, loess and paleosol, element geochemistry, chemical weathering, controlling factors