Grain-size Characteristics and Climate Variability in TMS5e Sequence of Tumen Section in Southern Tengger Desert, Northwestern China[J]. Chinese Geographical Science, 2012, 22(1): 48-62.
Citation: Grain-size Characteristics and Climate Variability in TMS5e Sequence of Tumen Section in Southern Tengger Desert, Northwestern China[J]. Chinese Geographical Science, 2012, 22(1): 48-62.

Grain-size Characteristics and Climate Variability in TMS5e Sequence of Tumen Section in Southern Tengger Desert, Northwestern China

  • Received Date: 2011-02-23
  • Rev Recd Date: 2011-04-18
  • Publish Date: 2012-01-03
  • The TMS5e sequence from the Tumen section, at the southern edge of China's Tengger Desert, is synchronous with Marine Isotope Stage 5e (MIS5e). It consists of 16 layers of aeolian dune sands, 11 layers of lacustrine loess-like facies, and 5 layers of lacustrine facies. Our grain-size analysis showed that the palaeo-mobile dune sands, palaeo-fixed to semi-fixed dune sands and loess-like sandy loams are mainly composed of sands, ranging from 70 to 96%; their silt contents ranged from 4 to 20%, and their clay contents ranged from 1 to 5%; the climate under which the aeolian dune sands were deposited is similar to that under which modern mobile dune sands form, which is caused by the dominance of the cold, dry East Asian winter monsoon. In contrast, the lacustrine loess-like facies and lacustrine facies had a lower sand contents than those the three aeolian dune sands,but have higher silt and clay contents, most of their sand content ranged from 30 to 60%, their silt contents ranged from 35 to 55%, and their clay contents ranged from 6 to 20%.The lacustrine loess-like facies and lacustrine facies formed under the influence of the warm, humid East Asian summer monsoon based on their similarity with modern sediments. The grain-size indicator Mz (mean grain diameter) and the SC/D value in the TMS5e sequence indicate climatic instability at the southern edge of the Tengger Desert during MIS5e, with at least 14 fluctuations between a warm, humid climate and a cold, dry climate, divided into five stages: TMS5e5 (139 to 129.30 ka B.P.), TMS5e4 (129.30 to 124ka B.P.), TMS5e3 (124 to 119.50 ka B.P.), TMS5e2 (119.5 to 116.5 ka B.P.), and TMS5e1 (116.5 to 113.70 ka B.P.). These correspond roughly to MIS5e5, MIS5e4, MIS5e3, MIS5e2, and MIS5e1, respectively, in the GRIP ice core data.
  • 加载中
通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

  1. 本站搜索
  2. 百度学术搜索
  3. 万方数据库搜索
  4. CNKI搜索

Article Metrics

Article views(993) PDF downloads(1491) Cited by()

Proportional views
Related

Grain-size Characteristics and Climate Variability in TMS5e Sequence of Tumen Section in Southern Tengger Desert, Northwestern China

Abstract: The TMS5e sequence from the Tumen section, at the southern edge of China's Tengger Desert, is synchronous with Marine Isotope Stage 5e (MIS5e). It consists of 16 layers of aeolian dune sands, 11 layers of lacustrine loess-like facies, and 5 layers of lacustrine facies. Our grain-size analysis showed that the palaeo-mobile dune sands, palaeo-fixed to semi-fixed dune sands and loess-like sandy loams are mainly composed of sands, ranging from 70 to 96%; their silt contents ranged from 4 to 20%, and their clay contents ranged from 1 to 5%; the climate under which the aeolian dune sands were deposited is similar to that under which modern mobile dune sands form, which is caused by the dominance of the cold, dry East Asian winter monsoon. In contrast, the lacustrine loess-like facies and lacustrine facies had a lower sand contents than those the three aeolian dune sands,but have higher silt and clay contents, most of their sand content ranged from 30 to 60%, their silt contents ranged from 35 to 55%, and their clay contents ranged from 6 to 20%.The lacustrine loess-like facies and lacustrine facies formed under the influence of the warm, humid East Asian summer monsoon based on their similarity with modern sediments. The grain-size indicator Mz (mean grain diameter) and the SC/D value in the TMS5e sequence indicate climatic instability at the southern edge of the Tengger Desert during MIS5e, with at least 14 fluctuations between a warm, humid climate and a cold, dry climate, divided into five stages: TMS5e5 (139 to 129.30 ka B.P.), TMS5e4 (129.30 to 124ka B.P.), TMS5e3 (124 to 119.50 ka B.P.), TMS5e2 (119.5 to 116.5 ka B.P.), and TMS5e1 (116.5 to 113.70 ka B.P.). These correspond roughly to MIS5e5, MIS5e4, MIS5e3, MIS5e2, and MIS5e1, respectively, in the GRIP ice core data.

Grain-size Characteristics and Climate Variability in TMS5e Sequence of Tumen Section in Southern Tengger Desert, Northwestern China[J]. Chinese Geographical Science, 2012, 22(1): 48-62.
Citation: Grain-size Characteristics and Climate Variability in TMS5e Sequence of Tumen Section in Southern Tengger Desert, Northwestern China[J]. Chinese Geographical Science, 2012, 22(1): 48-62.

Catalog

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return