HOLOCENE AEOLIAN DEPOSITS AND ENVIRONMENTAL EVOLUTION IN YILI VALLEY, XINJIANG
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摘要: 通过对新疆伊犁塔克尔莫乎尔沙漠可克达拉剖面(TKP)有机碳(TOC)、氧化铁(Fe2O3)及频率磁化率(Xfd)的分析,探讨了新疆伊犁河谷晚全新世以来的气候演变。结果显示:3.71~1.50 kaBP期间该区气候总体上比较干旱,气候干湿变化复杂,并经历了凉湿(3.71~3.06 kaBP)、极端干旱(3.06~2.63 kaBP)和相对湿润(2.63~1.50 kaBP)的演变过程。1.50~0.50 kaBP期间TOC、Fe2O3和Xfd的平均含量均达到全剖面的最高值,可能代表着这段时期区域降水比较丰沛,为伊犁河谷地区近4 ka以来气候最为适宜的时期。0.5 kaBP以来,伊犁河谷气候迅速地向干旱化发展。Abstract: This paper discusses the Late Holocene climate evolution in the Yili Valley of Xinjinag, based on the TOC, Fe2O3 and Xfd 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 Xfd 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.
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Key words:
- the Keledala profile /
- Late Holocence /
- climate change /
- Yili of Xinjiang
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