The major elements and the chemical indicators are highly correlated with different grain-sizes in the ZZ profile.
The major elements and the chemical indicators vary considerably among different grain size fractions in the ZZ profile. There are high correlations between fine population and CaO/MgO, Ti/Sr, CIA, which are relatively good paleoclimatic indicators in aeolian deposits area.
In 3.8–2.5 ka BP, the climate was optimum.