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《ARID LAND GEOGRAPHY》 2000-01
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LOESS DEPOSITS IN THE SURROUNDING MOUNTAINS OF TARIM BASIN, NORTHWESTERN CHINA

Yang Xiaoping (Institute of Geology and Geophysics, Chinese Academy of sciences, Beijing 100029)  
Loess and loess like sediments are vastly spread over the marginal mountains of the Tarim Basin and Zhungaer Basin in Xinjiang of northwestern China. Around the basins there are often two different aeolian sedimentation belts, which are separately covered by loess, and loess like deposits. Generally speaking, the loess is more intensively developed in the southern margin of the basin than in the northern. On the northern flank of Kunlun Mountains,loess is mainly distributed between 2 500m and 3 400m a.s.l.(above see level), and its thickness is seldom over two dozen meters. Small loess patches with a thickness of about 1m may occur even at the elevation over 5 000 m a.s.l. But in the Tianshan Mountains, the loess is considerably restricted to 950m and 2 400 m a.s.l. on the southern flank, and 800m and 2 000m on the northern side. The samples taken from Tashikuergan to Yütian of the northern flank of Kunlun Mountains show the grain size of loess tends to increase from West to East. Compared with Loess Plateau, the loess in Xinjiang is generally coarser probably owing to its shorter transport distance. The samples from Pulu in the upper reaches of Keriya River indicate that the percentage of heavy minerals in the loess is 5.5% on average. The content of stable and very stable minerals is only some 20%. One third of the heavy minerals is hornblende. Besides, the content of epidote, iron minerals and black mica is relatively high also. From the field investigation and laboratory analysis, it concludes that the preserved loess in the surrounding mountains of the Tarim Basin has been deposited mainly in Holocene. There the loess accumulation takes place principally during the intergalcial periods. Under the more severe climatic conditions of glacial times, the vegetation in the present loess zone would deteriorate considerably, and a stronger deflation and sand accumulation would replace the process of loess sedimentation. But in the northern flank of Tianshan Mountains, several layers of paleosol are present in the loess section, and both Holocene and late Pleistocene loess is observed.
【Fund】: 中国科学院资助!项目 (批准号 :KZ95 2 -5 1-4 3 8)
【CateGory Index】: P535.245
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1 Tang Zihua①② Mu Guijin③ Chen Dongmei④ Wu Xinhua⑤ Ali Aysa⑤(①Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing100029;②Graduate University of Chinese Academy of Sciences,Beijing100049;③Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,rümqi830011;④Academy of Exploration and Development,Northwest Company,SINOPEC,rümqi830011;⑤Institute of Archaeology,Chinese Academy of Social Sciences,Beijing100710);EOLIAN DEPOSITS IN NORTHERN SLOPE OF KUNLUN Mts AND THEIR PALAEOENVIRONMENTAL IMPLICATIONS DURING THE PAST 5000 YEARS[J];Quaternary Sciences;2007-04
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1 JIAO Ke-qin~(1), Shuji IWATA~(2), YAO Tan-dong~(3,4), JING Zhe-fan~(1), LI Zhong-qin+1 (1.Cold and Arid Regions Environment and Engineering Research Institute ,Chinese Academy of Sciences, Lanzhou Gansu 730000, China; 2.Institute of Geography, Tokya University, Japan; 3.Institute of Tibetan Platuea Research, Chinese Academy of Sciences, Beijing 100085, China; 4.Key Laboratary of Ice Core and Cold Regions Environment, CAREERI, CAS, Lanzhou Gansu 730000, China);Variation of Zepu Glacier and Environmental Change in the Eastern Nyainqêntanglha Range since 3.2 ka BP[J];Journal of Glaciology and Geocryology;2005-01
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1 LI Zhi-zhong1,2,3,LING Zhi-yong1,3,CHEN Xiu-ling1,2,WANG Shao-pu3,CAO Xiang-dong3 ( 1. Geography Science College,Fujian Normal University,Fuzhou,Fujian 350007; 2. Provincial Key Lab of Subtropical Resources and Environment of Fujian,Fuzhou,Fujian 350007; 3. Geography Science and Tourism College,Xinjiang Normal University,Urumqi,Xinjiang 830054 );Late Holocene Climate Changes Revealed by Grain-size Cycles in Takemukul Desert in Yili of Xinjiang[J];Scientia Geographica Sinica;2010-04
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