LOESS SEDIMENTS IN THE NORTH SLOPE OF TIANSHAN MOUNTAINS AND ITS INDICATION OF DESERTIFICATION SINCE MIDDLE PLEISTOCENE

SHI Zheng-tao; FANG Xiao-min; SONG You-gui; AN Zhi-sheng; YANG Sheng-li

Marine Geology & Quaternary Geology > 2006 > 26(3): 109-114.

SHI Zheng-tao, FANG Xiao-min, SONG You-gui, AN Zhi-sheng, YANG Sheng-li. LOESS SEDIMENTS IN THE NORTH SLOPE OF TIANSHAN MOUNTAINS AND ITS INDICATION OF DESERTIFICATION SINCE MIDDLE PLEISTOCENE[J]. Marine Geology & Quaternary Geology, 2006, 26(3): 109-114.

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LOESS SEDIMENTS IN THE NORTH SLOPE OF TIANSHAN MOUNTAINS AND ITS INDICATION OF DESERTIFICATION SINCE MIDDLE PLEISTOCENE

1 SKLLQG, Institute of Earth and Environment, Chinese Academy of Sciences, Xi'an 710075, China;
2 School of Tourism and Geography, Yunnan Normal University, Kunming 650092, China;
3 Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China

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Received Date: November 18, 2005
Revised Date: February 14, 2006

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Abstract

Abstract

Loess sediments in Xinjiang in the interior of Asia possess important environment information such as the formation and development of deserts,air-circulation,and the uplift of Tibetan Plateau. In this study,detailed climatic proxies of a 71 m-thick eolian loess section at Dongwanzhen in Shawan County,located at the north slope of Tianshan,are measured and analyzed. Environment history of North Xinjiang area since middle Pleistocene has been reconstructed. The environment history with a gradual drying trend can be divided into three periods. The first period from 0.80 to 0.60 Ma is a relative wet stage,the second period from 0.60 to 0.25 Ma is an accelerated drying stage,and the third period from 0.25 Ma to now is the formation of modern dry climate stage. Two significant climatic events that happened around 0.60 and 0.25 Ma promoted the process of drying. These evidences indicate the deserts existed in North Xinjiang area as early as 0.8 Ma,and the modern dry climatic pattern formed during 0.25 Ma.
- loess-palesol,
- desertification,
- north slope of Tianshan

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References (23)

References

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