HOLOCENE AEOLIAN DEPOSITS AND ENVIRONMENTAL EVOLUTION IN YILI VALLEY, XINJIANG

This paper discusses the Late Holocene climate evolution in the Yili Valley of Xinjinag, based on the TOC, Fe₂O₃ and X_fd from the Keledala profile in Takermohur Desert. The result shows that, in the stage of 3.71~1.50 kaBP, the climate in this area, as a whole, was relatively dry and experienced complicated changes. It was cold and humid during the period of 3.70~3.06 kaBP; extremely dry during the period of 3.06~2.63 kaBP, and relatively humid during the period of 2.63~1.50 kaBP. The average contents of TOC, Fe₂O₃ and X_fd reached the peak in 1.50~0.5 kaBP. It indicates that precipitation in this area was relatively high then, and the climate reached the best since 4 kaBP. Since 0.5 kaBP, the Yili valley has remained in drought.