Abstract
A stabilized sand dune from the southern Hunshandake (Otindag) sandy land in northeastern China was studied for reconstructing past environmental changes by optically stimulated luminescence (OSL) dating, magnetic susceptibility and particle size analysis. The OSL dating results indicate that the sandy deposits at the bottom of the section formed at ∼11.8ka ago, corresponding to low magnetic susceptibility and low fractions of fine particles (<63μm). The variations of the two climate proxies suggest that the region was mainly influenced by arid climate. Above the bottom sand layer, there are loamy soils, which formed between ∼6.2 and ∼4.3ka ago. The soils have relatively higher magnetic susceptibility and finer grain size than the bottom sands. The climate of this period was relatively warm and humid, dominated by enhanced summer monsoon. During the late Holocene (from ∼4ka to present), Hunshandake was dominated by semi-humid to arid climate, as indicated by the aeolian sand beds and interbedded weak sandy soils.
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