Grain-size features of a Miocene loess-soil sequence at Qinan: Implications on its origin

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• 作者：Yansong Qiao (1) (3)
  Zhengtang Guo (1) (2)
  Qingzhen Hao (1)
  Qiuzhen Yin (1)
  Baoyin Yuan (1)
  Tungsheng Liu (1)
  
• 关键词：Qinan ; Miocene loess ; soil sequence ; grain ; size ; eolian origin
• 刊名：Science China Earth Sciences
• 出版年：2006
• 出版时间：July 2006
• 年：2006
• 卷：49
• 期：7
• 页码：731-738
• 全文大小：1104KB
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• 作者单位：Yansong Qiao (1) (3)
  Zhengtang Guo (1) (2)
  Qingzhen Hao (1)
  Qiuzhen Yin (1)
  Baoyin Yuan (1)
  Tungsheng Liu (1)
  
  1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
  3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China
  2. Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710075, China
  
• ISSN：1869-1897

文摘

In this study, grain-size of 507 bulk samples from the QA-I Miocene loess-soil sequence at Qinan were analyzed, and the grain-size features are compared with those of typical Quaternary loess and soil samples, representative lacustrine and fluvial samples. The results indicate that the grain-size distribution pattern of the Miocene loess is essentially similar to that of Quaternary loess, but greatly differs from the lacustrine and fluvial sediments. Loess layers are regularly coarser than soil layers, indicating cyclical climate changes. Median grain-size along the 253.1 m sequence varies from 6 to 13 μm and the >63 μm fraction represents only 5.3% in maximum, 0.9% in average. Long-term grain-size variations are consistent with the loess accumulation rate at Qinan and with the eolian mass accumulation rate in the North Pacific. These features firmly indicate an eolian origin of the studied sequence, and also reveal a coeval changes between the long-term changes of eolian grain-size and continental aridity in the dust source regions.